Originally Posted by Dave has 2 yfm80s

Carb was carbon fouling plugs and running poorly when warm. Even an Amazon replacement carb tdid exactly the same way. Obviously running too rich. Finally figured out that the top of the throttle slide needle has a circlip for adjusting mixture. Moved the circlip to the top position which puts the needle lower into the carburetor and runs much leaner. The badger ran perfectly after that.