[lmntguy]

My sons 2006 CRF250R has 4hrs on it after installation of new factory cam and followers at a local Honda dealership, it now refuses to kickstart cold and when jumped smokes until warmed up,also does pop a bit more than ever before, runs fine when warmed up. They did a leakdown test on it and said it was fine.... I assume w/the new cam valve shimming is not an issue. any ideas....

[crfsonly]

welcome to CRF's Only. you should verify the valve clearances are in spec. here's a how-to on checking and adjusting:

http://crfsonly.com/howto/crf250x/crf-v ... stment.php

also, your jetting could now be lean. try going up one on the pilot and adjust the fuel screw out.

again, welcome!

ken

[lmntguy]

Thanks Ken,
The cold air up here in Maine probably requires seasonal jetting adjustments so we will try that.....