07 CRF 250 Mod Jetting

[JW 123]

Just got done modding our CRF 250 07 model. We put in a PC hi-comp piston, Kibblewhite oversize valves, Hot Cam, polished the exhaust ports, Yoshi pipe.

Curious if anyone else has this setup and what your baseline setting is?

Using U-4. 300-400 ft above sea level

Thanks for any info

John Wilder

Cranked it up last night an it sounded like a 450 with the Yoshi.

[JW 123]

We are getting the dreaded off idle bog on this bike also. I did the AP mod on all our older bikes and it cured the problem, I thought they had changed the AP on the 07s.

[JW 123]

Went to a 180 main and this thing is a rocket! SOunds like a 450. Still if I quicky turn the throttle it will bog, as long as I roll the throttle it will go fine seems to handle jump landings its just the off idle bog I think there is a 42 pilot in there. Any suggestions.