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BF 40 hp idling high

zimnucks

Contributing Member
Ive got this old bf40 and I cant get the engine to idle lower , Ive done the carbs and she runs great but idles high . Any ideas ?
 
Have you tried backing off the idle stop screw on the bottom carburator?

You may not have cleaned the intake manifold gasket surface and you are allowing more air to enter the combustion chamber. Also, check the carb base gaskets to be sure all is well there.

Mike
 
You can answer Mike's question about intake leaks by spraying carb cleaner at those points that he mentioned while the engine is idling. If the tempo of the engine changes when you spray a particular place, then you have found your leak.
Good luck.
 
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