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· Official Curmudgeon
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5,207 Posts
The whistle sound like a vacuum leak. Spray carb cleaner around the gaskets and hoses until it quits
then you've found the leak. If the mixture you're talking about is the screws at the bottom of the carb,
that's for idle air adjustment (not to bee confused with the one on the linkage for idle speed adjustment).


 

· Official Curmudgeon
Joined
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5,207 Posts
I'd say if the whistle is worse the more you close the screws and better if you open them, you defiantly
have a vacuum leak. Close the screws as much as you can and still keep the engine running and
check for leaks.

If the whistle gets worse as you open the screws, I really don't know unless you have them open way
too far or have a plugged passage hole. The rule of thumb for most carbs is to close both screws and
open them one and a half to two turns but read the directions that came with the rebuild kit. From that
point you make slight adjustments until the engine is smooth and slightly below the highest RPM you
can get. I hope I'm remembering correctly, check the instructions.


 
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