USER GUIDE
Contents
1. quality standards LRP guarantees this product to be free from defects in materials or workmanship for 90 days from the original date of purchase verified by sales receipt This limited warranty doesn t cover defects which are a result of normal wear misuse or improper mainte nance This applies among other things on Engine disassembly by customer Any modification of the engine done by the customer Rust inside the engine Dust or dirt inside the engine Damaged engine due to glow plug failure Overheating Scratches inside the engine caused by dirt or dust Water in fuel Wrong break in procedure Damaged piston due to piston stop devices Damaged cylinder exhaust port due to piston stop devices Breakages at high rpm without engine load To eliminate all other possibilities or improper handling first check all other components and the trouble shooting guide before you send in this product for repair or warranty Products sent in for repair that operate perfect have to be charged with a service fee By sending in this product you assign LRP to repair the product if it is no warranty case The Original sales receipt including date of purchase needs to be included Otherwise no warranty can be granted For quick repair and return service add your address and detailed description of the malfunction Our limited warranty liability shall be limited to repairing the unit to our original specifications In no case shall our liability exceed th2. smoke coming from the muffler now Tune the engine by leaning the main needle 1 8 turn at a time turn clockwise Your goal will be that the engine will just reach maximum RPM on the straightaway Open the main needle again by an 1 8 turn turn counter clockwise when you have reached nn should be the perfect setting for the main needle temperature of 110 130 C If the main needle is set too lean the engine will overheat and will not accelerate smoothly If this happens immediately stop the engine and richen the main needle counterclock wise 1 4 turn before a new attempt Adjust the mid range needle now Run 3 full laps stop the car near you and let it idle for 5secs Push off It should have slightly richened up idle rpm gets lower but still accelerate quickly If it died before the 5secs check the following ee rpm constantly decreases and finally the engine stops the mid range needle is too rich If the idle speed increases during idle the mid range needle is too lean You may have to re adjust the idle speed now If it idles too high the clutch may not release completely and you will lose snap off the corners If it idles too low it may stall at the start or at the end of the straightaway when you release the throttle Ways to measure the engine temperature e Temperature gauge method recommended Pull in quickly and immediately take a tempera ture reading Place the gauge directly over the en
3. MA000143 ORDER NO 32802 Z 28R SPEC 3 3 89 PS PULLSTART USER GUIDE LRP electronic GmbH Wilhelm Enssle Str 132 134 73630 Remshalden Germany Tel int 49 7181 4098 0 Fax int 49 7181 4098 30 INFO LRP ELECTRONIC DE WWW LRP ELECTRONIC DE TECHNICAL DATA Engine size 28 4 59ccm Exhaust Rear Bore 18 5mm Stroke 17 0mm Liner ABC Number of ports 8 1 8x transfer 1x exhaust port Crankshaft 13 0mm SG Shaft Crankcase LRP VTEC 28 Heavy Duty black coloured Piston Fully CNC machined high silicium alloy Connecting Rod Fork shaped aluminium using double bushings Glowplug LRP Standard style R5 No 35050 included Carburetor VTEC Competition slide carburetor 9 0mm venturi improved design Power Output 3 89 PS Max RPM 33 500 Weight 450g Figures may vary depending on used fuel muffler and tuning A WARNING NOTES Never leave your RC model unattended when the engine is running If a fault should occur the result could be a fire in the model which could destroy anything else in the vicinity e All nitro engines produce gases which are very dangerous for your health one of them is carbonium monoxide which can lead to death Always use your engine outdoors or in well ventilated areas only e Nitro engines and their surroundings get very hot You can seriously burn yourself when you touch them e Never try to stop a running engine with your fingers Pinch the fuel line or close the top of the carburetor Not suita
4. at there will be a new failure soon Some important matters Clean the outside of the engine properly before you open it Any dust or dirt which gets into the engine could make considerable damage Check the conrod frequently If you want to replace the conrod be sure the big end of your crankshaft is still round and at a good size If not also replace the crankshaft When you start putting your engine back together make sure that each part is totally clean before installation and please use some oil after run is suited well to lubricate everything Be careful that each part has its correct direction especially piston liner conrod Both the lower part of the piston and the lubrication hole in the conrod should be facing to the front direction to the carburetor Before you install the combustion chamber please doublecheck that you installed all head shims Use a hex wrench to install the screws When you start to feel resistance stop turning the screw Repeat this for each screw use the star technique to tighten all the screws complete ly Do not overtighten them TROUBLE SHOOTING GUIDE Engine does not start properly check the glow plug igniter Engine is set too rich check carburetor settings repeat tuning too much fuel hits back procedure unscrew the glow plug completely and pull the Pullstart 5 times Engine is too lean too little fuel does not start Engine doesn t suck in the fuel check the fuel line for possib
5. ble for children under 14 years this engine is not a toy Never use regular gasoline or airplane fuel Use fresh 2 stroke model car fuel only We recom mend using our line of LRP high quality fuels No 35710 25 1L No 35730 25 3 5L For the LRP Z 28R Spec 3 Pullstart engine we recommend a fuel with 25 nitro A higher nitro content decreases your engine s lifetime Therefore do never exceed 36 nitro AIRFILTER A good airfilter is very important for the life of your engine Never run without an airfilter as quick and permanent damage will result Don t forget to impregnate the airfilter with a suitable oil before usage Carefully clean the airfilter at least after every tenth tank Replace the airfilter every 3 litres 1 gallon of usage We recommend the use of our LRP Hi Flow 2 stage airfilter No 36560 together with our LRP Hi Flow airfilter oil No 36590 GLOWPLUG Use only standard style glow plugs for this engine We recommend using our line of high quality LRP Platinum Iridium glowplugs No 35030 No 35060 availabe as R3 to R6 Check them frequently and never run with worn out or old glow plugs since they could damage your engine They turn dull when your engine was too lean and should be replaced They should stay bright like chrome If the glowplugs wear out too fast an additional 0 1mm shim between burnroom and liner is recommended Whenever you have trouble with the engine stalling for no reason replace the gl
6. e original cost of this unit Because we don t have con trol over the installation or use of this product we can t accept any liability for any damages resulting from using this product By installing or operating this product the user accepts all resulting liability The specifications like weight size and others should be seen as guide values Due to ongoing technical improvements which are done in the interest of the product LRP does not take any responsibility for the accuracy of these specs LRP Distributor Service e Package your product carefully and include sales receipt and detailed description of mal function e Send parcel to your national LRP distributor e Distributor repairs or exchanges the product e Shipment back to you usually by COD cash on delivery but this is subject to your national LRP distributor s general policy
7. ead shims when the cooling head is mounted We suggest to start with 0 20mm 0 008 shims underneath the combustion chamber You may want to adjust the shims depending on nitro content see table or track layout Large tracks may require an extra 0 10mm 0 004 shim to reach higher topspeed and improved fuel consumption but this will decrease acceleration slightly Nitro content Real head clearance 0 65 0 025 0 75mm 0 029 0 80mm 0 031 Head shims 0 00mm 0 000 0 10mm 0 004 0 15mm 0 006 CARBURETOR The factory settings of the engine are as following and are a good starting point for you if you are not satisfied with your carburetor settings Turn in the needles completely Caution Do not overtighten them and loosen them the required number of turns again e Mid range 3 75 turns e Main 3 75 turns Idle screw No 1 Adjusts the air flow when carburetor is fully closed Turn CW for higher idle speed and CCW for lower idle speed Should be open 0 5 1 0mm Mid range needle No 2 Adjusts the mid low speed flow rate of the fuel Turn CW for leaner and CCW for richer setting Main speed needle No 3 Adjusts the main flow rate of the fuel when the throttle is opened significantly Turn CW for leaner and CCW for richer setting Proper run in of the engine is a very important step in ensuring that you get the highest perfor mance and lifetime of your engine Take your time for proper run in Do
8. gine pointed at the glow plug Spit method Pull in quickly and immediately put some spit on the engine s head The spittle should just slowly boil off 2 3secs It should not dance around as if it were on a hot griddle nor should it lay there and steam AFTER RUN Use after run oil to keep everything lubricated after you have finished your day After run oil helps for an easy start the next time and protects your internals against rust Use only after run oil specially formulated for R C engines Do not use silicone shock oil or similar as they will seriously harm your engine We recommend to use our LRP After Run oil No 37910 which you should use regularly after using your engine Procedure First let the tank run completely empty at idle until it runs out of fuel try re starting it several times next put a few drops down the open carburetor and a few drops down the glow plug hole Spin it over with the Pullstart at least 5 times and you are done MAINTENANCE Treat your engine with care and check it frequently This engine will rev up to 33 500 RPM and any fault at such high RPM can cause serious damage All moving parts inside the engine are subject to wear you must know if a piston liner conrod has worn out and if they need to be replaced If you replace one part please check if everything else is still in good shape at the same time If you only change one part and other parts are in bad shape there s the possibility th
9. le damage check the carburetor setting Engine stops after a Glow plug defective replace glow plug short time after glow Bad fuel replace fuel by fresh and correct type of fuel Au igniter la been Bad carburetor setting check the carburetor setting repeat tuning isconnecte procedure Dirt in fuel line or carburetor clean fuel line clean amp check carburetor Fuel line damaged replace fuel line Loose glow plug or cooling head tighten glow plug and or cooling head check carburetor setting repeat tuning procedure Air filter old or dirt clean or replace air filter Performance Engine is set too lean check the carburetor setting repeat tuning decreases after procedure reaching operating Glow plug defective or wron replace the glow plug by a correct type temperature or engine type ae 9 P N yP stalls from time to time Engine runs too hot run in process is not completed Shims under comb chamber check number of shims wrong Engine still keeps Bad carburetor setting open mid range needle 1 4 turn at a time and running at high RPM re adjust idle speed for a moment when set idle speed lower you release the trage Glow plug wrong type too hot use glow plug with higher number e g go from 5 to 6 Shims under comb chamber check number of shims wrong REPAIR PROCEDURES LIMITED WARRANTY All products from LRP electronic hereinafter called LRP are manufactured according to the highest
10. not use run in benches but use your car for run in Use the same fuel as you will be using for the life of the engine Special run in fuel is not needed If your engine doesn t start easily you may try loosen the glow plug by 2 turn to decompress the engine and try again Don t forget to tighten the glow plug again once the engine started Procedure Start the engine and set the main needle very rich i e excessive smoke coming from the muffler Let the engine idle for 2mins first to warm it up Now start driving your car it will be slow and sluggish but this is an important step Do not allow the engine to rev up too high run the engine at half speed on the straightaway The engine should not be too cold and not too hot during run in 70 90 C 160 195 F is per fect Let the engine cool down for 15mins after each tank during the run in period We recommend doing so for 4 tanks of fuel before you start tuning your engine EXPLOSIONSZEICHNUNG EXPLOSION DRAWING 32802 LRP Z 28R Spec 3 Pullstart complete carburetor gt CARBURETOR 38490 g 38332 contains 38130 ERSATZTEILE SPARE PARTS ORDER NO spare part description ORDER NO spare part description 39293 Z 28R Front Ball Bearing Z 28R Spec 3 Pullstart Crankshaft 38130 Z 28R Rear Ball Bearing 38237 Z 28R Burn Room amp Head Shim Set 38231 Z 28R Vari
11. ous Parts Bag 38232 Z 28R O Ring Set 38131 Z 28R Spec 3 Pullstart Slide Carburetor Set 38132 Z 28R Spec 3 Pullstart Cylinder Head Set 38491 Z 28R Freilauflager Seilzugstarter TUNINGTEILE OPTION PARTS BEST NR Artikelbezeichnung BEST NR Artikelbezeichnung ORDER NO spare part description ORDER NO spare part description 36261 Monstertruck Hi Monstertruck Hi Performance Resorohr Resorohr 35030 LRP Platinum Iridium Glowplug R3 standard style 38134 Z 28R Rotostart oo 35040 LRP Platinum Iridium Glowplug R4 standard style 38136 Z 28R Rotostartaufnahme inkl Getriebe 35050 LRP Platinum Iridium Glowplug R5 standard style S 35060 LRP Platinum Iridium Glowplug R6 standard style TUNING It never hurts to have the mixture too rich but NEVER let the mixture get too lean Always tune from rich to lean If in doubt richen it up first Never try to tune a cold engine run 3 5 minutes to get the engine up to running temperature before doing any adjustments Basic tuning procedure is as follows 1 Set the engine s idle speed up slightly higher than normal 2 Start tuning your engine with the settings too rich 3 Always tune main speed needle top end first 4 Tune mid range needle next 5 Reset idle speed screw Procedure Set the idle speed so your engine doesn t stall slightly higher then normal Go to the track with the main needle set too rich there should be heavy
12. ow plug first TIP Our LRP Team normaly uses a LRP Platinum Iridium R5 No 35050 plug for the LRP Z 28R Spec 3 Pullstart engine Under race conditions a LRP Platinum Iridium R6 No 35060 plug is used Dear Customer thank you for your trust in this LRP product By purchasing a LRP nitro engine you have choosen a high performance and highly sophisticated product which doesn t make any compromise between maximum performance and easy tuneability We hope you enjoy your new engine Please read the following instructions to ensure that your LRP Z 28R Spec 3 Pullstart engine always works up to your full satisfaction Please read and understand these instructions completely before you use this product With operating this product you accept the LRP warranty terms EXHAUST SYSTEM Never run without a pipe since this will cause excessive overheating and may damage your engine A good pipe has a very huge effect on the performance of a 2 stroke engine For the LRP Z 28R Spec 3 Pullstart we recommend using our LRP Monstertruck Hi Performance pipe No 36261 for maximum performance HEAD CLEARANCE We recommend a real head clearance between piston and burnroom of about 0 75mm 0 029 or more when the piston is at Top Dead Center The real head clearance can be calculated as follows Real head clearance Thickness of head shims 0 65mm that s due to the internal construction of the engine and the compression of the h
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