Does Boulevard S40 have backfire or popping problems?

[blaine]

Originally Posted by dentheman

This leaves me wondering if similar adjustments can be done to the GZ to improve its performance? You may be able to tell I am still trying to 'get smart' about motorcycles. (I used to be a jet mechanic, but this is all new to me.)

If you check under "performance mods" there is a big section on on shiming the needle jet and changing main jet.I rejeted my bike and find a big difference in performance.The G.Z. and the S40 have very similar carbs.