Getting right to the point, this bike rips! The RM-Z motor got the full treatment with a head mod, high compression piston, cams, titanium valves, clutch springs, full titanium exhaust and several other goodies. The result of these upgrades was quite impressive. Obviously it’s fast, which makes everyone happy, but what’s most impressive, is how the power is delivered. It has a very broad power curve for a 250. The feeling is closer to that of a 450 than a standard 250 because it always feels like you are in the right gear. It has tons of torque and still pulls hard up top, so you can short shift, pull a taller gear in the turns much like a 450, or you can rev it out. Either way the motor always feels like it is pulling. It is very responsive, and not “hard to control” responsive, but “right there when you want it” responsive. The motor does exactly what you want when you twist the throttle, without any hesitation. The power delivery is smooth, but strong. If you think you need a gnarly hit to have a fast motor, forget about it, this bike pulled 195lbs over doubles and triples right out of turns with ease, and that’s impressive for a 250F. The stiffer clutch springs added a little more pull at the lever, but that was only noticeable when the bike was on the stand. I was happy with the stock RM-Z motor, but just wanted a little more power all the way around. The PC motor went above and beyond that and made this bike a lot of fun to ride.