That's what Rick told me as well,that the 39 did as much or more than the 42.

 

Bubba, thank you for the info. I was wondering what everyone thought about te 42mm.
BUT,I stillhave a problem with those dam float levels.
I ride Real hard and fast all the time and here In New Jersey we have alot of big deep woops so the floats must see alot of vibes. there seems there is nothing I can do but stay with the kehin even though everytime I ride it it starts to get very rich.It is even hard to keep run smooth.I'm allway f#@&ing with the dam thing to keep it LEAN. Evertime te floats get high THE bike gets rich .NOW I do even know how rght my Jetting is . I'm at sea level and i have a 160 main jet and a 35 pilot. DOES THIS SEEM RIGHT TO ANY OF YOU. AND I"M STILL TO RICH!!!!!!!!!!!!!!!

 

Fixitmatt,I'm at sea level also.I run a 178 main 35 pilot,EEG needle.I also switched from the B9ES plug to the B8ES.It seemed like i was kinda having the same tinkering problems,most of them went away with the hotter plug.