Check the carburetor bolts for tightness and the carb gasket where it bolts onto the intake manifold. Check the gooseneck intake fitting bolts at each cylinder and the gooseneck gaskets. Extra air leaking in leans the mixture, and adding carb heat richens it back up again.

Syd



n3155h wrote:

We checked the carb heat hoses and shroud, all incoming hot air from
baffle in engine compartment. You mean intake on the carb,heat box?
Please give me some hints, where would you look?


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