I have the tm40-6 and for the most part i am happy with it. i run a 140 main jet and a 25 pilot jet currently with the needle all the way up, 1.2 air jet and a 45 pump nozzle. For the record i have this on a 2005 Yamaha V-Star 1100, all custom by myself. Made my own manifold on the intake and on the highway i average about 50mpg or around 230 miles on a tank.
The only issue i have with the carb is that the pilot jet, weather it is a 17.5, 20, or 22.5, all seem to cause it to backfire occasionally. Tried every air jet from 0.5 up to 1.8 as well. the a/f screw doesn't seem to make any difference wheather it is closed or open, ( no change anywhere in between) in rpm or anything. Anyone have a suggestion(s) on what to change?
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