hehe, cleaned your carb yet?

As soon as you do, your question will be answered for you, and do not believe the last guy that said he already did it.

The main needle in the middle of the slider, that goes down thru the tube at the bottom of which is the main jet, has an E-clip attached to it in a position, one of 5 positions, in the middle slot will be self explanatory when you take your carbs apart for the spring cleaning. Several good websites on here with detailed directions if you have never done it.

First things first, what carbs do you have? as in year, or span of years?

H.C.C.M.F. Local 6978
http://hondacb750parts.net