Have recently done up my 21 with the usual upgrades of pipes, reed valves, rear head conversion etc. Yesterdays race weekend went well, but there are some issues with excess fuel/unburnt fuel.

When I came in after each session there was fuel almost dripping out of the cans. Initially I thought main jets, but with the helpful interpretation of a two stroke mechanic parked next to me I did a plug chop which showed a nice burn on the plugs. So it seems that there is not an issue with overfueling at high revs. And it definitely runs well, will rev the whole way up and lift a wheel with no issues, and faster than my brothers set up Aprilia (go Honda!).

However it does bog down heavilly between 7-8.5k and the abovementioned mechanic suggested that the main jets were probably good, but the pilot jets may be too large. Is this a likely cause of the excess fuel/unburnt fuel symptoms, or is it likely to be something else?

I'm not after specific jetting advice, just some helpful information. If it is indeed a specific question of jetting I will ask in the members forum.

Cheers guys!