OPERATING INSTRUCTIONS
Contents
1. INTRODUCTION The Magnum XL 61RFS is a single cylinder overhead valve four stroke engine incorporating ringed piston technology for long life and high power output A dual needle valve carburetor is employed for easy and precise mixture adjustments A polished aluminum muffler is included to keep the noise to a minimum without sacrificing power T he engine was designed by expert engineers and built by master craftsmen using only the highest qual ity materials and CNC machinery These qualities provide the long life and dependability you have come to expect from an engine of this caliber BECOMINGFAMILIARWITH YOUR XL 61RFS ENGINE If you arefamiliar with the operation of model engines or just can t waitto run your new engine please read through the Quick Starting Guide in cluded This guide will help you get started right away and includes some good recommendations also We do recommend reading through this in struction sheet in its entirety to familiarize yourself with the features and operation of your new engine We have also included a Troubleshooting Guide should you encounter any problems Please use the photo below to familiarize yourself with the components of your new XL 61RFS engine AL amp 1RFS OPERATING INSTRUCTIONS Bore 24 8mm Practical RPM 2 000 12 000 Stroke 20 6mm Weight w Muffler 15 502 Displacement 61cu in WARNINGS M agnum model engines will consistently give you dependable per2. to prevent the muffler from loosening Q 3 Using a 1 4 drill bit drill out the center hub in the propeller Install the propeller to the engine using the propeller washer and nuts provided Tighten the propeller nut securely using an adjustable wrench Q Engine Starting Q 1 Carefully turn the high speed needle valve in completely until it stops then turn the needle valve out 2 1 2 turns This is the mixture setting for initial starting QU 2 If hand starting prime the engine by opening the throttle bar rel completely placing your finger over the muffler opening and flip ping the propeller through compression 2 3 times If you will be using an electric starter do not prime the engine The starter will turn the engine over fast enough to draw fuel on its own Q 3 Connectthe glow starter to the glow plug Open the carbure tor barrel to about 1 4 throttle and start the engine If you are starting the engine by hand you will need to vigorously flip the propeller several times before the engine will start Once the engine begins running im mediately turn the high speed needle valve in about 1 4 turn to keep the engine running Q 4 Advancethethrottleto full while slowly turning the high speed needle valve in to keep the engine running The engine should be pro ducing a very noticeable white exhaust from the muffler and sound like itis running very rough Allow the engine to run only for about 5 min utes then shut the engine o
3. Ring 12860 Needle Valve Assembly Complete 12861 N eedle Valve w O Ring 160120 Head Bolt Set 40134 Backplate Bolt Set 52102 Backplate 52109 Front Bearing 52 110 Rear Bearing 52111 Backplate Gasket 52134 Carburetor Bolt Set 52204 Connecting Rod 52210 Crankshaft 52213 Wrist Pin Set 52218 W oodruff Key 52228 Prop Nuts and Washer Set 52606 Muffler Assembly 52714 Cam Gear 52729 Cam Lifter Set 2 52801 Carburetor Assembly TOME OO ww gt
4. you Never use your bare hand or serious injury could result To make the engine easier to start by hand it should first be primed This is done by opening the carburetor completely and choking the engine by put ting your finger over the muffler opening With your finger over the muf fler opening pull the propeller through the compression stroke 2 3 times This will draw fuel into the engine Over priming the engine can cause the engine to hydro lock or flood This is a result of too much fuel in the engine before it actually fires Remove your finger from over the muffler opening and pull the propeller through the compression stroke once to check for a hydro locked condition Never try to start the engine if it is in a hydro locked state This could cause serious damage both to yourself and to the engine Q Starting with an Electric Starter W hen using an electric starter it is not necessary to prime the engine The starter turns the engine over fast enough that the engine draws fuel on its own Priming the engine prior to using an electric starter can cause the engine to hydro lock or flood This is a result of too much fuel in the engine before it actually fires Trying to start the engine with an electric starter while the engine is flooded can cause extreme damage to the engine and or cause your propeller assembly to come loose Pull the propeller through the compression stroke one time by hand to check for a hy
5. your engine for service An omission of this request implies permission for the M agnum Service Center to service your engine at our discretion Include a method of payment for any service charges If not specified the unit will be returned to you C O D Send the engine to us by United Parcel Service Federal Express or by Insured M ail Postage is not refundable Send to Magnum Service Center 18480 Bandilier Circle Fountain Valley CA 92728 Phone 714 963 0329 Fax 714 964 6236 E mail serviceQ globalhobby net XL IRFS PARTS BREAK DOWN Complete 52601 To order replacement parts visit your nearest Magnum Engines dealer or call the Magnum Engines Service Center direct at 1 714 963 0329 Parts PARTS LIST are listed below in numerical order 52 52 52 52 52 52 Drive W asher w W oodruff Key 52816 Carburetor O Ring Rotor Bolt 52831 ntake Pipe Gasket dle Needle Valve w O Ring 52863 Carburetor Body w Spray Bar I dle Stop Screw 61103F Cylinder Head w Valves nstalled Pushrod Set 1 61112F Head Gasket Set ntake Pipe w Gasket 6123F S leeve Only 52 Exhaust Pipe Set 65236 Piston Ring 52 ntake Valve Set 61231F Piston Only 52 Exhaust Valve Set 61101FX Crankcase 52 Rocker ArmSet 52 Rocker Cover Set 52 M Cam Gear Cover Set 12109 Cam Gear Bearing Set 12518 ntake Pipe Bolt Set 12812 Throttle Arm 12819 Fuel Nipple w Gasket 12833 Detent Spring 12845 N eedle Valve O
6. alve mixture to a slightly leaner setting about 1 4 turn more in Let the engine run for about 5 minutes at this setting then stop the engine and let it cool for approximately 10 minutes Q 7 Repeat the procedure in step 6 while leaning the needle valve slightly more each time In all you should run the engine about a total of 30 minutes of actual running time A fter 30 minutes of run time the engine is ready for flight Fly the airplane with the engine set as rich as possible but with adequate power to fly the airplane After each flight lean the mixture slightly Continue to do this for about 5 flights At this point the engine should hold a good setting on the high speed needle valve and you can begin to fine tune the needle valve settings to increase performance FINE TUNINGTHE XL 61RFS Now that your engine has been broken in you can set the high and low speed needle valves for optimum engine performance Note Be careful to never lean out the engine too much Remember that the lubricants for your engine are suspended in the fuel If you lean out the fuel mixture too much you will also be lowering the amount of ubricant entering your engine Less lubricant means more chance of your engine overheating and possible engine failure Q Setting the High Speed Needle Valve QU 1 Start the engine and remove the power from the glow plug Al low the engine to warm up for about 1 minute Q 2 After the engine has warmed up slowly le
7. an the high speed mix ture until the engine reaches peak R P M After reaching peak R P M richen the mixture slightly until an audible drop in R P M is heard If you are using a tachometer this should be between a 200 300 R P M drop Q 3 With the engine running at full power carefully lift the nose of the airplane about 452 into the air The mixture should not become too lean but you may hear a slight increase in R P M This is normal If the engine sags or loses R P M when you hold the nose up the mixture is too lean Note R P M will increase about 1096 3096 in theair Thisis dueto the forward motion of the aircraft as itis flying Because of this more air is entering the carburetor at a higher force and causes the mixture to lean out Additionally as the fuel level in the fuel tank goes down fuel draw becomes more difficult for the engine especially during aerobatics also causing the mixture to go lean It is imperative that you set the mixture rich whileon theground to compensate for the leaning tendencies that will happen in the air Always watch the exhaust during your flight The en gine should leave a noticeable white smoke trail at all times It there is no smoke trail the engine is running too lean You should land immediately and reset the mixture Q Setting the Low Speed Needle Valve Q 1 Start the engine and lean out the high speed needle valve as per the previous steps Close the throttle until the slowest r
8. ance OUR RECOMMENDATIONS QUICK STARTING The following items are recommended for use with the XL 61RFS engine These items are recommended for initial start up and running Please read through the Operating Instructions for further details Q Fuel Power Master 10 2 Stroke Blend 275180 for break in Power M aster 10 4 Stroke Blend 275185 for normal use We suggest using Power M aster brand fuels Power M aster fuels come in 10 and 15 nitromethane contents that can be used in the X L 61RFS engine Power M aster fuels are blended using only high quality ni tromethane methanol Castor Oil and synthetic lubricants to provide high power output along with easy starting and unmatched lubricating and heat dissipation qualities For the extra lubrication necessary for break in use 10 2 stroke blend A fter break in for extra performance use 10 15 4 stroke blend Q Fuel Tank Dubro 10oz Fuel Tank 568501 The Dubro 100z fuel tank is a perfect match for the XL 61RFS Itis large enough to give you about 15 20 minutes of run time at full throttle and is very easy to assemble and maintain Q Glow Plug Thunderbolt 4 cycle 115490 The Thunderbolt 4 cycle glow plug is designed to be used in four stroke engines using fuels containing 10 20 nitro content and in any envi ronment Itis a hot type of glow plug perfect for easy starting excellent transition and incredible top end The plug is also very durabl
9. d in either direction It does not need adjustment The breather nipple on the bottom of the crankcase should be left open If necessary a piece of fuel tubing can be attached to it to vent excess oil out of the cowling NEVER use it as a pressure tap Q Carburetor Orientation In some cases the particular installation of the engine in your model may make it necessary to change the position of the carburetor You may want the throttle arm on the opposite side from how it comes preinstalled You can remove the carburetor and reinstall it in the opposite direction with no effect on performance To remove the carburetor loosen the two screws holding the intake manifold in place Next remove the two screws hold ing the carburetor to the engine Remove the carburetor by gently pulling it down off the intake pipe To reinstall the carburetor reverse the process We highly recommend applying machine oil to the o ring inside the carbu retor mounting base and to the carburetor mounting flange on the intake pipe This will prevent the o ring from being damaged when you reinstall the carburetor Q Needle Valve Extension If an extension is required to adjust the high speed needle valve use a 1 5mm diameter wire of the necessary length Loosen the set screw in the side of the needle valve insert the wire into the end of the needle valve and tighten the set screw firmly If the extension is more than 3 long we recommend supporting the outer en
10. d of the extension to prevent it from vibrating excessively Q Propeller Installation Note Before installing any propeller it must be properly balanced Running an engine using an out of balance propeller can lead to excessive vibration which will cause excessive stress and wear on both the engine and the airframe Overall performance will be reduced also Balance the propeller using the recommended method stated by the propeller manufac turer Several products are available to properly balance propellers Ask your local retailer for more information about these items Using a 1 4 drill bit or a prop reamer drill out the hole in the propeller hub to fit the crankshaft The crankshaft is 1 4 in diameter Slide the propeller onto the crankshaft and up against the drive washer then slide the pro peller washer up against the pro peller Thread the prop nut onto the crankshaft and tighten it com pletely to secure the propeller in place Thread the safety nut into place and tighten it securely Use the proper size open end wrench or adjustable wrench Do not use pliers Note If you are installing a spinner onto your engine the cone of the spinner must not rub against the propeller If the spinner cone rubs against the propeller this could lead to propeller damage and eventual propeller failure PROPELLER FUEL amp GLOW PLUG Q Glow Plug Recommendation Glow plugs can make a big difference in how your engine performs Fo
11. dro locked state before applying the starter Note If the engine becomes hydro locked do not force the propeller through the compression stroke Remove the glow plug and quickly flip the propeller or apply an electric starter to expel the fuel from the cylinder BREAK IN PROCEDURE Note The XL 61RFS engine is a ringed engine A ringed engine is designed differently from a typical ABC designed engine that you might be more familiar with therefore you will not feel much hesitation as the pis ton moves through the top of the stroke A ringed engine does not have any taper in the sleeve Ring tension is what seals the combustion chamber When the engine is brand new it will not feel like it has much compression This is because the ring has not yet been seated with the sleeve After the engine has been broken in compression will increase The break in proce dure will guide you through the steps necessary to properly break in your new XL 61RFS ringed engine Please follow the steps closely The break in process allows the engine parts to perfectly fit to each other and properly protect each part from premature wear The engine should be broken in using a fuel that contains no more than 10 ni tromethane and no less than 20 Castor Oil lubricant Synthetic lubricant fuels should not be used during the break in procedure For the break in procedure we recommend mounting the engine into the airplane it will be used in This way the muffl
12. e XL 61RFS For the break in period you must use a fuel containing no more than 10 nitromethane and no less than 20 Castor Oil lubricant Use of fuel containing more than the recommended percentage of nitromethane or any synthetic lubricants will cause the engine to run too hot and result in excessive wear and engine failure in a very short period of time Once the engine has been adequately broken in about 1 gallon of the recommended break in fuel a fuel con taining up to but no more than 15 nitromethane and no less than 16 Castor Oil and synthetic lubricant blended fuel can be used Note We do not recommend using fuels that contain only synthetic lubricants Synthetic lubricants have a much lower flash point than Cas tor Oil lubricants Flash pointisthe point at which the lubricant begins to actually burn and loses its lubricating qualities U sing fuels containing a blend of Castor Oil and synthetic lubricants results in an engine that runs cooler and lasts longer One lean run using a fuel containing only syn thetic lubricants can cause engine failure Using fuels with a Castor Oil and synthetic blend of lubricants greatly reduces this chance HIGH amp LOW SPEED NEEDLE VALVES Q High Speed Needle Valve The high speed needle valve is used to meter the air fuel mixture at full throttle Turn the needle clockwise to lean the mixture or turn the needle counterclockwise to richen the mixture When you start the engine for the very fi
13. e and able to withstand repeated use APC 12 x 6 Propeller 608660 We have found that the engine runs at its best using APC brand props They are designed to be very efficient and run quiet at high R P M s and they are also durable Use this size prop to break in your engine then change to the prop that best suits your application Usethe guidein the Operating Instructions to help you find the right size propeller Q Glow Driver Magnum Glow Starter w M eter 237438 The M agnum glow starter is an excellent choice for heating the glow plug It uses a Sub C Nicad includes a meter to determine the quality of your glow plug and it also includes a charger to recharge the battery It s a very economical product to purchase and can be used with any engine that uses a glow plug a Motor Mount Dave Brown Products Motor M ount 218141 The Dave Brown Products motor mount is a glass filled type that mounts to a plywood firewall in the model It is easy to install and rugged yet in the event of a crash will break away to minimize damage to the engine and or airframe Q Propeller Q Engine Preparation Q 1 Mount the engine to the recommended motor mount A wood beam mount built into the airframe would also be sufficient Q 2 Install the muffler and exhaust pipe onto the engine using the two nuts provided The muffler assembly can be rotated to better suit the installation in your model Be sure to tighten the two nuts securely
14. e should be aircraft grade plywood no less than 1 4 thick The firewall should also be reinforced to meet the torque and power of the engine a Muffler and Exhaust Pipe Installation The muffler threads onto the exhaust pipe which then threads into the side of the cylinder head Both assemblies are held in place using two nuts First thread one nut onto one end of the exhaust pipe then thread the muffler onto the exhaust pipe The muffler should be threaded on no less than 1 4 to prevent vibration from damaging the threads Once you havethreaded the muffler onto the exhaust pipe use an open end wrench and tighten the nut up against the muffler This will prevent the muffler from loosening Thread the second nut onto the exhaust pipe then thread the exhaust pipe into the cylinder head The pipe should be threaded in no less than 1 4 to prevent vibra tion from damaging the threads The exhaust pipe is adjustable to better match the scale appearance and installation of your particular model Once you have threaded the exhaust pipe into place and into the proper position for your application use an open end wrench to tighten the nut against the cylinder head This will prevent the exhaust pipe from loosening Q Fuel Tank Size and Orientation to Carburetor Ideally the stopper in the fuel tank should be even with the high speed needle valve or just slightly below it M ost models will only allow the fuel tank to be mounted higher than
15. eliable idle is reached Allow the engine to idle for about 30 seconds Q 2 Quickly advance the throttle to full If the engine just stops run ning as soon as the throttle is advanced the idle mixture is too lean With the engine stopped richen the idle mixture about 1 8 of a turn Q 3 Repeatsteps 1 and 2 until the engine will transition from idle to full throttle smoothly M inor hesitation in the transition is normal Q 4 If you quickly advance the throttle from idle to full throttle and the engine seems to be very rich during transition i e lots of smoke com ing from the exhaust and very rough sounding the mixture is too rich With the engine stopped lean the idle mixture about 1 8 of a turn Q 5 Repeat steps 1 and 4 until the engine will transition from idle to full throttle smoothly M inor hesitation in the transition is normal VALVE ADJ USTMENTS Q Adjusting the Valves The valve clearances are preset from the factory but do require periodic adjustment Reset the valves after the first 1 hour of engine running After that the valves can be checked and adjusted about every 8 hours of run ning The valves will need adjustment if you notice a severe loss of power or after you have repaired or reassembled the engine Q 1 With the engine cold remove the rocker cover on top of the cylinder head by unscrewing the two socket cap screws Q 2 Rotate the crankshaft until the piston is at top dead center B
16. eplace C Use an electric starter to start engine D Reset idle mixture screw to factory setting E Replace with new fuel F Remove glow plug and expel fuel from cylinder G Check and or replace fuel tank assembly H Replace fuel lines and or tighten all engine bolts Readjust valves to correct setting 2 Engine does not draw fuel A Air leak in fuel system and or engine B High Speed Needle Valve fully closed C Idle mixture screw set too lean D Fuel lines kinked E Defective fuel tank A Replace fuel lines and or tighten all engine bolts B Reset high speed needle valve to factory setting C Reset idle mixture to factory setting D Check and straighten fuel lines E Replace fuel tank 3 Engine vibrates excessively A Propeller out of balance B Engine and or motor mount loose A Balance propeller B Tighten all motor mounting bolts 4 Engine does not transition A Failed and or wrong type glow plug B Old and or wrong type fuel C High speed needle valve set too rich D Idle mixture set too lean E Idle mixture set too rich F Airleak in fuel system and or engine G Propeller too large H Valves out of adjustment A Replace with new recommended glow plug B Replace with new recommended fuel C Reset high speed needle valve to leaner setting D Set idle mixture richer E Set idle mixture leaner F Replace fuel lines and or tighten all engine bolts G Replace with one size smaller propelle
17. er fuel tank and throttle linkage can all be tested in combination with the engine If your airplane uses a cowling it should be removed during the break in procedure Q 1 Turn the high speed needle valve out 2 1 2 turns from the fully closed position Q 2 If you are using an electric starter to start the engine follow the corresponding procedure in the previous section If you are starting the engine by hand follow the appropriate procedure in the previous section Q 3 Open the throttle barrel to approximately 1 4 throttle Connect the power to the glow plug Start the engine using an electric starter or by hand If starting by hand you will need to vigorously flip the propeller through the compression stroke several times before the engine will start Q 4 Oncetheenginestarts open the throttle barrel to about 1 2 throttle You may need to lean the high speed needle valve in about 1 4 turn to keep the engine running at half throttle Q 5 After the engine has been running for about 1 minute remove the power from the glow plug Advance the throttle barrel to full throttle Adjust the high speed needle valve so that the engine is running very rich You should notice excessive white smoke coming from the exhaust and the engine should sound like it s running very rough Let the engine run for approximately 5 minutes then stop the engine Q 6 Letthe engine cool for approximately 10 minutes then restart it Set the high speed needle v
18. ff Q 5 Now that you have started your XL 61RFS engine it must be properly broken in Proper break in will seat all of the moving parts particularly the piston ring and valves This procedure takes about 30 minutes of run time and is highly recommended An engine that is properly broken in will produce more power be more user friendly and last much longer than an engine that does not receive a break in period Forthis reason we highly recommend following the break in procedure detailed in the Operating Instructions before you run the engine further TROUBLESHOOTING GUIDE This troubleshooting guide has been provided to help you diagnose and solve most problems that you may encounter with your M agnum X L GIRFS engine M ost problems encountered can be solved by carefully following the problem cause solution sections below If you cannot solve the problem using this troubleshooting guide please feel free to contact us at the address phone number or email address listed below PROBLEM CAUSE SOLUTION 1 Engine does not start A Failed glow plug B Glow Starter not charged and or faulty C Engine not being turned over fast enough D Idle mixture screw set too lean E Old or contaminated fuel F Engine flooded with too much fuel G Faulty fuel tank and or stopper assembly H Air leak in fuel system and or engine l Valves out of adjustment A Replace glow plug with a new one B Fully charge glow starter and or r
19. for mance and reliability and will be a source of satisfaction and pleasure if you follow these instructions for the engine s proper and safe use You alone are responsible for the safe operation of your engine so act sensi bly and with care at all times This M agnum model engine is not a toy It is a precision built machine whose power is capable of causing serious injury to yourself and others if abused misused or if you fail to observe proper safety precautions while using it Keep spectators especially small children at least 20 feet away from the engine while itis running Mount the engine securely in the airplane or on a suitable engine test stand to run the engine Follow the mounting instructions in your kits in struction manual or on the plans for individual mounting recommendations Do not clamp the engine in a vise to test run it Use the recommended size propeller and follow the proper procedure for mounting the propeller Use an adjustable wrench to tighten the pro peller nut and the safety nut Do not use pliers eg inspect the spinner propeller and propeller nuts on a regular basis looking for any signs of nicks cracks or loosening To stop the engine adjust the throttle linkage to completely close the throttle barrel and therefore cut off the fuel air supply Y ou can also pinch the fuel line to stop the engine but only if itis accessible Do not throw anything into the spinning propeller or attempt to u
20. ne after you have purged the engine of fuel Inject the oil into the engine through the carburetor and through the glow plug hole Remove the glow plug Flip the propeller several times to distribute the lubricant inside the engine After run oil will coat the internal parts of the engine most importantly the ball bearings preventing rust from building up Q Wipe the outside of the engine dry using a soft cloth Q Use a fuel filter between the fuel tank and the carburetor to prevent debris from getting into the carburetor s spray bar assembly Q After about every 20 flights use the two hex wrenches provided with the engine to double check the tightness of all of the engine bolts MAGNUM XL ARFS QUICK START and TROUBLESHOOTING GUIDE The following information is provided to get your new Magnum XL 61RFS running right away with minimal effort We have listed our recommendations for fuel propeller starting procedures and other recommended accessories Also included is general information about the acces sories needed for the M agnum XL 61RFS engine that we hope you will find helpful This Quick Start Guide should not be used as a replacement to the Operating Instructions included rather it should be used along with the Operating Instructions We highly recommend reading through the Operating Instructions to familiarize yourself with each part of the engine along with the proper procedures for engine break in tuning care and mainten
21. oth valves will be closed at this point Q 3 Therequired valve clearance is between 04mm and 10mm mea sured between the valve stem and the rocker arm Use feeler gauges to check the clearance The 04mm gauge should pass through the gap with only slight friction The 10mm feeler gauge should be tight Rocker Arm ES Adjustment Hex May Yi 04mm 10mm IX Gap gt 7 gt asher Valve P d Valve Spring D dd a 4 Working with one valve at a time loosen the hex nut using a small wrench Use a screwdriver and turn the adjustment screw counter clockwise about 1 2 turn This will open the gap slightly Slide the 04mm feeler gauge between the rocker arm and the valve stem Carefully turn the adjustment screw clockwise until the rocker arm touches the feeler gauge Using a small wrench tighten the hex nut Q 5 Removethefeeler gauge and double check the gap Repeat step 4 if necessary to achieve the correct setting Repeat for the second valve MAINTENANCE Q Avoid running the engine under dusty conditions If you are in a dusty environment we suggest using an air filter over the carburetor A small piece of women s nylon stocking placed over the carburetor opening and held in place with a small rubber band works well Q Attheend of every flying day purge the engine of fuel by disconnect ing or pinching the fuel line and allowing the engine to run dry of fuel Q Useahigh quality after run oil in the engi
22. r H Readjust valves to correct setting 5 Throttle barrel does not close completely A Throttle servo linkage out of adjustment B Idle stop screw out of adjustment A A djust throttle linkage to close throttle barrel B Readjust idle stop screw so throttle barrel closes 6 Engine Overheats A Engine running too lean B Cowl too restrictive C Wrong type of fuel used D Engine not fully broken in A Richen high speed needle valve B Open larger vents in cowling to allow air to exit C Use fuel with recommended oil content D Allow engine further break in time 7 Engine stops abruptly A Engine running too lean A Richen high speed needle valve RETURNING FOR SERVI CE All M agnum engines returned for warranty service must be within the warranty terms as stated on the warranty card provided with your engine Do not return the engine to the place of purchase They are not authorized or equipped to perform warranty work on M agnum products When requesting warranty service please observe the following lways send the complete engine including the carburetor and muffler The engine must be removed from the model include a note detailing the problem or service you are requesting Service cannot be provided without this information Include your daytime phone number in the event we need more details pertaining to the service requested Y ou may request an estimate of services at the time you return
23. r the XL 61RFS we recommend using a hot type of glow plug intended specifically for four cycle engines Do not use cold glow plugs or those intended for two cycle engines Using the wrong type of glow plug will cause the engine to run erratic and make it difficult to tune properly Q Propeller Recommendation The diameter and pitch of the propeller needed for the XL GIRFS will vary greatly depending on the application the engine is used in The weight drag and the type of model and how you intend to fly it are all factors in determining the correct size of propeller to use Experimentation will be necessary to find the optimal size propeller for your particular application Ideally you want to use a propeller that the engine will turn in the 9 000 12 000 R P M range on the ground yet power the airplane sufficiently Using a propeller that is too small will cause the engine to run at too high an R P M Using a propeller that is too large will cause the engine to run at too low an R P M causing the engine to lug down too much In both instances this will lead to difficulty in making needle valve adjustments premature engine wear and eventual engine failure Acceptable Propellers 11x9 12x7 13x6 11x8 12x6 13x5 11x10 12x8 13x7 Use a 12 x 6 propeller for the break in procedure Q Fuel Recommendation Fuel can make a big difference in the way your engine performs We rec ommend using two types of fuel with th
24. rst time the needle valve should be turned in completely then backed out 2 1 2 turns When you start the engine after that leave the needle valve in the same position it was in when you shut down the engine Q Low Speed Needle Valve The low speed needle valve meters the air fuel mixture at idle and during transition from idle to full throttle Turn the low speed needle clockwise to lean the mixture Turn it counterclockwise to richen the mixture The low speed needle valve is preset from the factory but minor adjustments may need to be made to suit your application i e fuel used glow plug and environment all contribute to the setting To reset the low speed needle valve to the factory setting open the carburetor barrel completely While holding the barrel open turn the needle in until it stops From this point turn the needle out 2 complete turns This is the factory setting It is possible to turn the idle mixture so lean that the engine will not draw fuel STARTING PROCEDURE The XL 61RFS can be started using an electric starter or it can be started by hand For safety and ease of starting especially when the engine is brand new we recommend using an electric starter The following two procedures should be done with the power to the glow plug off Q Starting by Hand When starting the engine by hand always use a chicken stick If you must use your finger wear a good leather glove to prevent the propeller from cutting
25. se your hands to stop the engine While the engine is running stand behind the engine to make any ad justments to the needle valves Do not reach over or around the propeller Do notlean towards the engine Do not wear loose clothing or allow any thing to be drawn into the spinning propeller while the engine is running Do not use tight fitting cowls over the engine They can restrict air from flowing over the engine and resultin engine damage from overheating ENGINEINSTALLATION Q Engine Orientation The Magnum XL 61RFS engine can be orientated in any position on the firewall Keep in mind that if you mount the engine inverted carburetor adjustments will need to be made differently and the fuel tank may need to be lowered See fuel tank size and orientation to carburetor on next page Engines mounted inverted tend to run richer during idle and transition to full throttle and are generally more difficult to set up and tune properly Q Engine Bolts and Firewall Requirements The XL 61RFS engine should be mounted to a glass filled or metal motor mount Dave Brown Products 218141 recommended or to an integrated wood beam mount built into the fuselage structure of the aircraft Use only high quality 6 sheet metal screws and washers to mount the engine to a glass filled mount Use 6 32 socket cap screws washers and lock nuts to mount the engine to a wood beam mount If using a glass filled mount the firewall in the airplan
26. the ideal location A fuel tank that is posi tioned higher than the ideal location usually doesn t pose any problem ex cept when itis mounted excessively higher and or used in conjunction with an inverted mounted engine or during extreme aerobatic flight If you mount your engine inverted it is advised to lower the fuel tank so that the stopper assembly is slightly below the high speed needle valve Doing this will prevent fuel from siphoning into the engine and flooding it when the fuel tank is full If you cannot lower the fuel tank far enough we suggest lowering it as far as possible in your particular application The size of the fuel tank used should be 100z 120z depending on the model and the length of flights desired Use of a 100z tank will pro vide between 15 20 minutes of run time at full throttle Use of a fuel tank any larger than 120z can lead to excessive leaning of the engine during flight and is not recommended Q Idle Stop Screw Rotor Bolt amp Breather Nipple The idle stop screw adjusts the closure of the throttle barrel Turning the z idle stop screw clockwise will make the throttle barrel stay open more Turning it counter clock wise will allow the throttle bar rel to be closed more A djust the idle stop screw so that you can close the throttle barrel com pletely to shut off the engine The rotor bolt holds the throttle barrel in the carburetor body and pre vents the throttle barrel from being over rotate
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