The CRF450R makes less horsepower than the YZ450F. The CRF450R has valve problems, unlike the YZ450F. The CRF450R has been proven to handle way sloppier than the YZ450F. The CRF450R holds less oil and burns it alot quicker than the YZ450F. ...make the right decision. -Doug Doug do you have to beat around the bush so much. Why not be more concise next time?