suspension settings and played with the fuel injection again theirs practically no difference between the 09 and 10 crf450r's
186 hp
2007 CR250R and a 2010 CRF450R
i have an 03 crf450r mostly stock and ive hit 91 and might get about 93
101mph
.006 in. Intake .011 in Exhaust
2006 CRF450R=50HP, my 06 dyno'd in at between 39 to 51 within seven tests so I'd say a straight 50 to the back wheel is the correct HP for this machine
Motorcycle oil
Hi , i know from experience that a 04 crf450r tank does not fit a 06 crf450r so id say its a fair guess that the 250s dont fit either
2.7ft lbs or 32.4 inch lbs
you pull the black knob on the side of the motor tho help with cold starts.
I know this doesn't answer the complete question, but its insightful. try this site: http://en.wikipedia.org/wiki/List_of_motocross_World_Championship_results
Anywhere from 80 to 90 depending on where you r riding and you shouldn't be asking the top speed of a motor cross bike.