a little backfire

[warriorkid23]

When i Rev up my engine and let off i get a little backfire. Does that mean im running too lean? How far should the air fuel screw be turned out?
Thanks
Justin

 

[yamarider]

Could be lean or rich, an extreme condition either way can cause backfiring.

Stock position for the fuel screw is 2-1/4 or 2-1/2 turns out. (it's not an air screw on 4 strokes, the further out it's turned, the more fuel it will deliver)

 

[warriorkid23]

Ok ill check that out Thanks!! One more thing when you say 2 1/4 turns is that a full 360 degree turn? Or is it just 180 degree. Im sorry i know its such a noob question.

 

[91warrior]

it should be 360 degrees for one turn. does it backfire when your just in neutral and rev it? or is it only when your riding it?

 

[warriorkid23]

only when im in neutral.