This is what I found on my 09 EC250R for Hawaii
38p/172m/2 1/4as - good traction, slow rev, excellent mpg
40p/172m/2 1/4as - good traction, great power, revs good. Current jetting
42p/180m/2 1/4-1/2 - motocross like, lots of power, quick rev signs off early, low traction wheel spin
We ride...