I have an '86 VF500F with clean carbs. It stumbles at approximately 5500 rpm. I'm told the problem might be the current reformulated gas, and possibly the local altitude (Denver at 5280 ft).
A Dynojet Stage 1 kit is supposed to help because the stock needle is not adjustable. Does anyone have suggestions for initial settings? Aside from a K&N filter, everything is stock and I'm doing a valve adjustment first.
Thanks!