User`s Manual for Roto 85 FS Engine
Contents
1. a place where it cannot be affected by excessive heat from the cylinder heads or the exhaust system If the ignition reaches a temperature of 60 C it will automatically turn off and the engine will stop running Warning Make sure the ignition gets sufficient cooling Connect the high voltage spark plug wires to the spark plugs and secure them with a 3mm screw that is between the ribs on the upper side of the cylinder head Warning The spark plug wires can be connected in any order Do not bend them Connecting the Ignition Recommended power for ignition is a 4 9V The batteries used for ignition have to be the high demand type Some NiMH types might not work well for ignition purposes Warning The batteries should be fully charged before each flight Starting for the First Time The first start has to follow these steps MII Make sure the ignition is turned off 111 TIT TTTTT TIT Engage the carburetor choke while if possible covering the carburetor air intake with your finger to achieve the best engine suction Spin the propeller blade approximately ten times then uncover the carburetor air intake turn the choke off turn the ignition on and start the engine without the choke The only time this method is used is during the initial suction of gasoline into the carburetor Allow the engine to warm up to its operating temperature Let the engine run for 15 20 minutes occasionally increasing the rpms The next s2. Engine Oil Discharge There is a small amount of unburnd engine oil used to lubricate the crankcase that needs to be discharged Please remove the cap from the small yellow threaded nozzle on the bottom side of the engine and connect a hose to it routing the oil away toward the chassis is preferred Warning Keep the discharge hose clear otherwise engine damage can occur Propeller Mounting It is very important to mount the propeller correctly There are 8 high strength steel 4mm screws used Please tighten them evenly Also make sure that the propeller is sitting flush with the mounting plate Warning Check for tightness of the screws regularly especially when the propeller is new and made of wood If the propeller comes loose the mounting screws can break and the engine would require authorized repair work In order to mount the propeller flush with the mounting plate you can measure the distance between one blade of the propeller and an attached object then rotate the blade 180 and measure the distance between the other blade and an attached object The distance must be the same Engine Lubrication The correct engine lubrication is achieved by adding engine oil to the gasoline in a 1 30 ratio Gas Oil Liter Liter 7 0 175 Use 95 98 octane gasoline The engine oil used should be high performance two stroke engine oil Warning To achieve long lasting engine performance always use high performance superior quality en
3. Operating instructions The second of a new generation of 4 stroke engines O C7 C O Czech Republic User s Manual for Roto 85 FS Engine Congratulations on purchasing the four stroke engine ROTO manufactured exclusively in the Czech Republic You have purchased a new four stroke twin cylinder gasoline engine It is important to follow a few necessary steps to insure a successful first start in your model airplane Since the engine has been started and tested by the manufacturer it will perform as required The engine has been adjusted and tested with an attached 25 10 propeller and the ROTO FS exhaust Recommended rpm are 1200 6000 Packaging content Engine 1 piece Ignition 1 piece Sparkplug wrench 1 piece Silicon hose 2 pieces Tie straps 4 pieces Engine Mounting For mounting the engine inside the model airplane we recommend using 5mm high strength steel bolts large flat washers and lock nuts Warning Check the engine mounting for tightness periodically Engine Installation It is necessary to provide enough fresh air to the intake of the carburetor In case of lack of air the engine may exhibit poor performance and it may fluctuate at the maximum speed It is necessary to ensure sufficient cooling of the cylinder heads and of the cylinders by sufficient supply of fresh air from the propeller and or from the ambient environment Exhaust The elbows of the exhaust can rotate As soon as the desired posi
4. gine oil Valve Adjustment In order to achieve long lasting engine performance the valve clearance needs to be checked and adjusted if necessary after 2 3 hours of operation To check and adjust the valve clearance remove the valve cover by unscrewing the mounting screws moving the engine into its top dead center position the mark on the propeller carrier needs to be aligned with the parting plane on the upper side of the engine After that you can start adjusting the valve clearance on the side of the engine where neither of the rocker arms are engaged Clearance adjustment Loosen the lock nut using a wrench After the desired clearance is achieved by turning the screw with a screwdriver retighten the lock nut Then proceed to the next valve Intake valve 0 1mm or 0 004 Exhaust valve 0 1mm or 0 004 After rotating the crankshaft by 360 repeat on the next valves and reassemble it If you do not have much experience doing the valve adjustment in this manner 1 Send the engine to an authorized repair shop for the valve adjustment 2 Get the information from the manufacturer at techinfo rotomotor cz Now the engine has been set up and no further adjustment will be needed unless other engine work is being done Ignition Warning Don t remove the sensor of the ignition from the back engine cover Installing the ignition is an important part of mounting the engine into the model airplane The ignition has to be placed in
5. ourself Do not jeopardize your safety follow the instructions and enjoy your new ROTO engine Peter Cita Manufacturer of ROTO Engines WARANTY REGISTRATION CARD Product name Type Product serial number Date of purchase Signature Dealer s name address Stamp ROTOmotor s r o Zbe n k 259 549 31 Hronov Czech Republic www rotomotor cz e mail rotomotor rotomotor cz Tel 00420 491 485 211 00420 777 596 8
6. tep is fine tuning the carburetor according to which exhaust system and propeller have been used Use the knob marked H to fine tune the highest output of the engine and the knob marked L to fine tune the highest rpm The idle speed can be adjusted using the controls on the radio transmitter For regular engine starting use of the choke less method is recommended Turn off the ignition activate the carburetor choke spin the propeller several times in order to suck gasoline into the engine then turn the choke off turn the ignition on and start the engine Warning This method of starting the engine is recommended if the engine is started several times per week If it is done less frequently another method is preferred Another way of starting the engine First turn the carburetor choke and the ignition on After the engine turns over turn the choke off and start the engine Warning Do not remove the gasoline from the chamber after use This would let air into the system and make it harder for the engine to start Safety Instructions Always use caution when handling the engine Even slow spinning of the propeller can start the engine and cause an injury Make sure to have the model airplane secured in place when starting the engine so it does not take off and cause an injury Do not approach people with the model airplane while its engine is running Do not touch the engine after flight you can burn y
7. tion is achieved the center 19 mm bolt can be tightened to fix them in place Warning Do not damage the exhaust elbows ends The extension pieces that can be attached to them might not seal properly The silicon hose is used to seal the joint between the exhaust elbows and the ROTO FS exhaust pipes or between the extension piece and the ROTO FS exhaust pipe The extension piece and the ROTO FS exhaust pipe are not part of the packaging Use the included tie straps on both ends of the silicon hose to connect the extension piece or the exhaust pipe 2 Warning Do not reduce the diameter of the exhaust pipes Warning The silicone hose properly seals only if the contact surfaces are clean of dirt and grease If repeated connection is made contact surfaces have to be cleaned and degreased Warning The gap between the elbows and the exhaust pipe should not exceed 2mm Fuel System The gas line needs to be connected to the carburetor Remove the protective cap from the carburetor s threaded nozzle and connect the gas line to it Warning Reinstalling the protective cap during extended periods while the engine is removed is recommended to prevent the carburetor from drying up and therefore causing the engine to malfunction Carburetor There is an air intake attached to the carburetor that must not be covered Warning Do not remove or alter the air intake It is a part of the engine responsible for its correct operation
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