Re: H Carb Adjustment???

Posted by CNKS on November 05, 2006 at 07:50:46 from (204.249.178.135):

In Reply to: Re: H Carb Adjustment??? posted by Tom Windsor on November 04, 2006 at 20:44:06:

The correct way to adjust a letter series carb (NOT the Super Series or the C113/123 with no main jet adjustment is: Use the 3 or so turns out to get it started. Let it warm up. Fiddle with the rpm and idle mixture screws until it idles smoothly. Set at full throttle. Turn the main jet screw in until it begins to stumble. Turn out until it runs smooth plus maybe 1/4 turn or so (this is arbitrary). Return to idle. Open throttle rapidly. If the engine does not accelerate rapidly without stumbling, you need to do the idle and main jst adjustments again. Do not turn the main jet out until it smokes, then in until it stops. Instead, if it seems to lack power under load, then open the main jet about a quarter turn at a time. What I presented is what the operators manual says, it has not failed me yet. This assumes that the carb is clean, float at the by the book height, and that the engine, ignition, etc, and the valve adjustment is correct. It is a very simple adjustment. If it fails you have carb ignition, or engine problems.

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