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Detailed instructions for use are in the User's Guide.
[. . . ] Do not use four cycle fuel due to low oil content. The needle valve should be set so that the engine is running at a rich setting. Run the engine approximately 20 minutes with this setting. [. . . ] Select a good quality propeller that will turn in the 9, 000 to 12, 000 rpm range. We recommend sizes 11x7-11x9, 12x6-12x8.
LOW SPEED ADJUSTMENT
This engine is equipped with a new low speed needle valve to adjust the mixture from low to mid throttle. This needle valve is located on the side of the throttle barrel opposite the throttle arm (Fig. 1). Open the low speed needle to 1 turns from fully closed position.
DIAPHRAGM AND CHECK VALVE DISASSEMBLY
Diaphragm 1. Remove the adjustment screw of the valve, and then remove the inside valve and spring. Clean the inside with alcohol or appropriate cleaner. Screw in the regulator screw until flush with the diaphragm body. Open the valve by rotating the body counterclockwise. Reassemble the check valve carefully.
IMPORTANT!Silicone rubber is used in many parts of the YS engine. Use only glow fuel or methanol for cleaning. Gasoline and other volatile solutions will damage the silicone if used.
START UP GLOW PLUG
Select the most appropriate plug from those designed specifically for 4 cycle engines. Glow plug selection greatly affects the maximum engine output and low idle. Remove tube B from the filter: remove tube A from the check valve, then fill the tank. (CAUTION: If tank is filled or under pressure remove tube A first, then tube B. Fuel will eject if tube B is removed while the tank is pressurized. [. . . ] Back plate Disc valve Disc valve pin Disc valve set screw Back plate gasket Back plate screws Carburetor assy. Carburetor body Throttle barrell Throttle barrell seal Throttle barrell retainer Throttle arm set Throttle stop screw Throttle stop spring Needle valve assy. Needle valve Needle valve O ring Needle socket Needle socket O ring set Needle valve detent Fuel nipple Low speed needle valve Low speed needle valve O ring Carburetor gasket Carburetor screws Regulator assy. [. . . ]
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