User manual MVVS 50 IRS V1.3

[. . . ] Operating instructions MVVS 50 IRS No: 3005L/3005S Before using the engine, please read these instructions carefully. Congratulations on choosing the MVVS 50 gas engine. The MVVS 50 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 40 mm 38 mm 1560 g 190 g Fuel Lubrication Unleaded 95octane fuel Oil with petrol in mixture 1:40 RpM range 1000 ­ 7500 RpM * 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 1) 2) 3) 4) 5) 6) Never use the engine for any manned vehicles. [. . . ] When fixing the propeller to the engine tighten the central nut and each screw several times over. Finally tighten the washer screws once again in sequence across each other. Exhaust System Use only factory-made exhausts pipes designed for this type of engine, preferably brand-name MVVS engines with which you also get the power output guaranteed. 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 ensure sufficient cooling of the exhaust. Carburetor Adjustment Basic setting: (The values are derived from the position of clock-hands) adjusting needle (L) for low revolutions range 2 turns and 0 min adjusting needle (H) for high revolutions range 1 turn and 30 min Caution!Never over-tighten adjusting needles by force, because it can cause damage to the needles and carburetor. Carburetors worn like this can not be adjusted and will need to be changed for a new one. After the engine has been run in, adjust it following the instructions below: - start the engine and warm it up - let the engine run at idle speed for approx. 5 seconds If the engine starts to run backwards do not open the throttle - stop the engine immediately!Step I Accelerate to 2/3 of the throttle range within approx. Repeat three times ­ if the engine accelerates quickly and without hesitation, go to Step III. If acceleration is not smooth go on to Step II. Step II Adjusting needle (L) Adjusting needle (H) Throttle lever Throttle stop screw Faulty acceleration with hesitation 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 still has bad acceleration, open the needle by 10 min (60 degree). If the engine's operation does not improve afterwards, stop it and check the basic setting. Set the adjusting needle L at 2 turns and the adjusting needle H at 1 turn and 30 min. Restart the engine again and test acceleration. [. . . ] Switch the ignition off and on again and restart the engine with throttle turned slightly down and the choke valve set open. 4) If the engine still would not start, unscrew the plug and check its contacts. Clean any possible petrol moisture (i. e. an indication of engine flooding) and screw it in again. [. . . ]