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JA-Moo · August 28th, 2012, 12:19 PM

I just found the bore/stroke for these little guys. The safe factor (RPM) for many years was 40000ft/min. It is much higher now for a lot of bigger bikes.

But for the 250 it is 14,796 rpm for 4000 ft/min. So even thought they rev high, they are really in the safe zone even at 14,000 RPM.

August 28th, 2012, 12:19 PM	#75
JA-Moo ninjette.org member Name: John Location: Rio Rancho Join Date: Aug 2012 Motorcycle(s): many kawasaki 2 stroke triples and a 250R now. Well no more 250R, 2013 300 now Posts: 146	I just found the bore/stroke for these little guys. The safe factor (RPM) for many years was 40000ft/min. It is much higher now for a lot of bigger bikes. But for the 250 it is 14,796 rpm for 4000 ft/min. So even thought they rev high, they are really in the safe zone even at 14,000 RPM.