Re: Tuning an H carb.. How???

Posted by CNKS on April 28, 2006 at 17:41:03 from (204.249.178.138):

In Reply to: Tuning an H carb.. How??? posted by Truck on April 28, 2006 at 15:14:06:

Initial setting is 2.5-3 turns out. It needs to be set as lean as possible, yet still give good performance. With the engine at operating temperature and with the throttle lever wide open, turn the main screw in until the engine begins to run rough, then out until smooth. Don't turn the screw out more than about 1/2 turn from that setting, none or 1/4 turn is probably better. You can set the idle mixture the same way, but with the throttle closed. Set the idle speed first, usually about as low as it will go without dying. Adjust the idle screw in or out until smooth, reset the speed to suit. Then open the throttle rapidly, the engine should accelerate without hesitation. If not repeat the entire process until it does. If it refuses, you have another problem that mixture adjustment won't fix.

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