I recently had my bike dyno`d & the reading came out at 25.1hp @ 8146 rpm,with 16.2ft lbs, this was taken from the crankshaft...at the wheel it read 22.8 hp 8146 rpm 14.8 ft lbs...this reading was with my bike suffering from worn crank bearings....
I had the motor stripped & fully rebuilt with all new genuine Kawasaki parts, I never replaced the piston as this was new only last year & has done very little use, the bore was excellent too & didn't require a replate, while it was apart I had the inlet & exhaust ports measured & professionally opened up & polished inc all the transfer ports etc, the head was also milled down, re-profiled & squish set, the piston was also modified to suit the inlet side. The jetting was dialled in on the dyno & the new reading was as follows...39.1 @ 9370rpm with 24.6 ft lbs (crank ) 35.9 bhp @ 9370 with 22.8 ft lbs.
So even after a full rebuild & tune my bike still doesn't perform like the manual says it should, was Kawasaki exaggerating the performance of these bikes?? I will say that even before the rebuild & tune my bike went very well & hard to believe with just 25 hp!....now its a real rocket ship with loads of power everywhere & I would say will give a 250 a good run for its money.
