I just had Eric do the 265 and mo' betta porting on my '02 CR250. A friend of mine has the same bike so it was very easy to make comparisons. My 265 literally runs away from his 250 now. The bike runs much stronger from the bottom through the top. It may lose a bit on the very top, but not that much. The bike is very easy to ride as the power is smooth and strong. Traction is easier to find, also. The ONLY thing I regret is not doing it sooner! I also recommend Eric's services highly. His work is excellent, and he is a great guy to deal with.