Martin,martin wrote:stan stevens told me all about the jetting when i had my 300cc conversion, he reckons standard pilot jet, needle in the second clip position from the top [standard second from bottom] and standard 135mains and [and maybe one size smaller main jet as there is a possability of the bike running rich at the top end] i am running mine all standard jetting with the 99e needle on the second clip from the top, i like you have had all sorts of problems getting the bike running right, i found that i needed to spend time getting the carbs right, they have to be spot bollock on. also found new coil and new stator made a big difference
I read somewhere you have some holes in your airbox. Did you try these taped up at all? Were these in there specifically for the 300 kit or is that how you got the bike? Have you got any details if you still have this lid fitted?
Cheers
Andrew