Ok I've taken it apart and cleaned it and it still is running poorly. Basically I can't run it much lower than full speed or somewhere between full and choke more accurately. I find a sweet spot and soon I engage the blade and rpm drops to near stall and it picks up then I engage drive and away I go but it's never running at constant speed.
Isn't there a sprung flap in carb throat that opens and closes according to engine speed? I see it move as engine nears stall. It's working but does this sound like my problem?
Needle valve was screwed down tightly, groove ground into tapered surface , is this critical?
What else do I look at?
Keith
