User manual MVVS 58 IRS LIMITED EDITION V1.7

[. . . ] 10) Always wear close-fitting, well-fastened clothes when starting or operating the running engine. 12) Always stop the engine either by turning off the ignition switch or by completely closing the carburetor throttle valve. Version 1. 7 13) Before starting the engine always make sure that the model is safely fixed in place and cannot start moving. 14) Fuel is combustible and therefore must be kept in an enclosed container at a safe distance from the engine when it is running. [. . . ] The situation is further complicated by environmental parameters (temperature and atmospheric pressure in particular): low temperature and high pressure increase propellers' input requirements by 20% in comparison with input in a hot weather. Suggested propeller dimensions: two-blade: 22x10, 22x12, 22x14 24x8, 24x9, 24x10, 24x12 25x7, 25x8, 25x9, 25x10, 25x12 26x7, 26x8, 26x9, 26x10 22x10, 22x12, 24x9, 24x10, 24x12 three-blade These values are only approximate and may vary with the factors described in the previous section, as well as with the type of the exhaust system used. MVVS 58 has been designed to generate maximum power at 6800 ­ 7100 RpM, according to the type of exhaust used. If you wish to utilize the maximum power output, choose a propeller, which allow the engine to reach these revolutions, or slightly lower revolutions (given the unloading of the propeller depending on the speed of flight) on the ground. We do not recommend using propellers with which the engine reaches more than 7500 RpM on the ground. Exhaust 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 secure 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 1turn and 45 min - adjusting needle (H) for high revolutions range 1 turn and 10 min The new engine comes adjusted to the basic setting. This setting should be kept during running the engine in! 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!Repeat three times ­ if the engine accelerates quickly and without a hiccup go to Step III. Step II Air pressure inlet Adjusting needle (H) Adjusting needle (L) Choke lever 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). 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 1 turn and 50 min and the adjusting needle H at 1 turn and 10 min. If engine does not accelerate properly, open the needle by another 10 min. [. . . ] Do not forget insert the gasket when reassembling the carburetor. Problem guide The engine would not start: check and possibly replace the spark plug (check the spark by inserting the plug into the plug socket and turning the engine. The correct electrode spacing is 0, 6 mm. ) check the fuel feed turn the engine to check its mechanical condition check whether the carburetor needles are adjusted correctly take the carburetor off and visually examine the condition of the carbon-fiber reed valve unscrew the carburetor cover on the side of the pressure inlet, check the fuel screen possibly give the carburetor a blow with a current of air; when reassembling, make sure you arrange the membrane and gasket in a correct order recheck the pressure hose attached to the carburetor Replacing the reed valve: unscrew and remove the carburetor (mind the gasket) unscrew four M4 screws on the flange, remove the flange and take off the reed valve (mind the gasket) unscrew four M2 screws and remove the old valves, replace them with new ones, screw the screws back in and tighten them gently when reassembling, make sure you fix the gasket correctly Mechanical faults of the engine must always be commit to a professional service department! Service information After each 20 hours of running or 1 year change the spark plug. After each 50 hours of operation time preventively check up the con-rod and the reed valve. [. . . ]