Originally Posted by netjustin
Not to speak of. I ran my Hyperpak XT550 at sears point to a very high RPM -- well beyond peak torque with my 266-x4 megacycle top end. Probably about 8500 RPM. Never hit a hard limit on the ignition side, just a subtle release in arm stretching surge that told me it was time to shift; way higher than the 7K RPM redline on my stock XT600.
I think the reason he is trying to ask is because he wants a rev limiter. Nothing will shorten a 4 stroke motor life quicker than over revving, especially a single!
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