Join Date: Feb 2011
Location: San Francisco Bay area
Thanked 70 Times in 70 Posts
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Re: Carburetor Adjustment
It's all guesswork without a CO meter, but the standard way to do it without, is to turn the screw in the lean direction until the engine begins to stall. Then turn it out slowly until it just runs nicely. You've now found the leanest mixture where it runs properly.
Bristol 31.1, San Francisco Bay