I was wondering how to get rid of that annoying bottom end bog as soon as you hit the throtle, my ride is a 1990 trail boss 350L 4x4 with a k&n air filter and a U.F.O. in the carb. my clutching is as follows: brown/green primary spring 55 gram weights ,in my secondary i have a blue spring with a stock helix. ive also made gearing changes the gearing at the time is 12:30. oh ya dont tell me its jetting because thats what my dealer said adt they were wrong.

 

Would you believe the UFO?

 

Niel I'm sure you fiddeled with the main jet. How about the piolet jet or ajusting the needle?