crf ignition with stock vavles?

[flees41]

Is anyone running the CRF bike ignition with stock vavles? I have ran the set up with ty vavles. Just want to know if the stock vavles with hold up with the extra rpm's

Thanks

[DirtDevilBT]

People are running the stock valves with dyna and vortex ignitions. If you are going to be raising the rpm limiter and possibly hitting it once in a while, I'd run some stiffer springs and possibly change to some KW SS valves. The intakes will cup, mine did after 80 hours.