standard cam new needle jet, i have replaced every part in the carb, only thing that could have affected i think is when i took the bell mouth off, the ring with the two allen key studs, it had an o ring of sorts commpressed into a machined groove, this was not fitted correctly and over lapped, i cut in down to fit correctly ensuring that the join was resealed with engineering sealant, also away from any appetures, and let it go off then re fitted, a neat job by all accounts, so am very sure this is not the problem, it was a flush fit so i dont think that there is any air leakage!!! sorry to be pissy pants about this but am a bit miffed by it!!!! only had the bike since summer and have been systematically replacing all parts affected by wear, this was meant to be the last job on the road to wheelie heaven!!!