Turn needle valve (high speed) clockwise until it closes. Do not force, stop when screw closes. Now open needle valve 1 1/8 turns counterclockwise. This will permit engine to start and final adjustment can be made after engine warms up.

– FINAL ADJUSTMENT Place governor speed control in “FAST” position (that means open throttle all the way). Turn needle valve in clockwise until engine slows(lean). Then turn it out counterclockwise past the smooth operating point(rich). Now turn the needle valve to the midpoint between lean and rich. Next adjust the idle mixture. Rotate the throttle counterclockwise and hold against stop.Adjust idle speed adjusting screw to obtain 1750 RPM. Holding throttle against the stop turn idle valve in (lean) and out (rich). Set at mid point between lean and rich. Re-check idle RPM. Release throttle. If engine will not accelerate properly, the carburetor should be re-adjusted, usually to a slightly richer mixture.