I have been tampering with this all day - This motor starts up and idles like a charm! however when I go to rev it up to a higher rpm it begins to smoke like crazy and wont open up all the way. It looks like its running real rich at high rpms. I took the 3 carbs off and cleaned them (I did not mess with the jets) and it still has the same trouble - any words of advice other than sell would be great!! Thanks Eddy