bike is bogging on bottom end

[motocgd]

I recently had my motor modified from a 125 to a 144. It is a rocket but boggs really bad on the bottom end. When it finally hits, it hits hard (almost uncontrollable). What do I do to my jetting????

 

[splatt]

Sounds like it's a little rich mine had the same problem after I had it big bored. It usually cleaned out and launched at the worst possible moment. You'll have to lean it out by adjusting the air screw,changing the pilot jet, or dropping the needle. Make only one change at a time though so you can keep track of whats going on.

 

Steve