User manual MVVS 152 IRS TWIN SPARK V1.3

[. . . ] Operating instructions MVVS 152 IRS No: 3011 MVVS 152 IRS Twin Spark No: 3011TS Before using the engine, please read these instructions carefully. Congratulations on choosing the gas engine MVVS 152cc. MVVS 152cc has been designed and manufactured for propeller-powered radio-controlled model planes. It is able to meet all of your expectations of an acrobatic racing engine. Technical specifications Bore Stroke Weight of complete engine without ignition* Weight of ignition unit 48 mm 42 mm 3530 g Fuel Unleaded 95-octane fuel Oil with petrol in mixture 1:40 RpM range 1000 ­ 7500 RpM 270 g Lubrication * Some manufacturers state the weight of incomplete engines. The value in the table above stands for the weight of a completely assembled engine, including the spark plug, carburetor, drive washer and prop screws. Safety precautions Never use the engine for any manned vehicles. [. . . ] Suggested propeller dimensions: Exhaust Use only factory-made exhausts pipes designed for this type of engine. Preferably MVVS exhaust system, which also guarantees the announced power output. The manufacturer declines all responsibility for all engine damages arising from the use of improper exhaust systems. When mounting the exhaust follow the manufacturer's instructions. Make sure to secure sufficient cooling of the exhaust. Carburetor adjustment Carburetor is adjusted before you buy it. It is not usually needed to change this setting (always apply if used recommended exhaust system and propeller). In most common flights you will need to set up the main nozzle only (except races). The engine must be stopped while you adjust the carburetor in order to prevent injury by the propeller. Basic setting: - adjusting needle (L) for low revolutions range: 1 turn - adjusting needle (H) for high revolutions range: 1 turn (the values are derived from the position of clock-hands, starting position: fully closed needle) The new engine comes adjusted to the basic setting. This setting should be kept during the engine running in!Pressure inlet Step I Accelerate to 2/3 of the throttle range within approx. Repeat three times ­ if the engine accelerates quickly and without a hiccup go to Step III. If acceleration is not smooth go on to Step II. Step II Faulty acceleration with hiccups and a tendency to cut out is usually attributable to a poor fuel mixture in the medium-revolutions range. Stop the engine and recheck the fuel feed (the hose-pipe must not be pinched or broken; if fitted, check also the fuel filter permeability). Restart the engine and test acceleration again. If problems persist adjust the carburetor. Open the adjusting needle L by 5 min and retest acceleration. If acceleration is smooth, open the needle by another 3-5 min - this should be done because the needle was previously set at a boundary value; if atmospheric conditions changed during flight, the problems might recur. If the engine continues to malaccelerate open the needle by 10 min if the engine's operation does not improve, stop it and check the basic setting. Set the adjusting needle L at 1 turn and the adjusting needle H at 1 turn . Restart the engine and test acceleration. If the engine runs correctly go to Step III. [. . . ] Clean any possible petrol moisture ( i. e. an indication of engine overflow ) and screw it in again. Further starting should only be done with the throttle turned down. If the plug is dry then probably not enough fuel has been drawn into the carburetor. [. . . ]