SLOW OR WHAT

Cant get my head round this its down to 70mph now… Dont suppose there is anyone near Glossop who know these motors is there ? The guy who had had it in the garage for the last few months seems to have done sod all with it Fed up of waiting now , took it out fitted a new battery ran it round the block and it felt just gutless…

Mine got like that, I had’nt noticed the loss in power till I jumped back onto the 500 then realised it was much quicker than the VF, an investigation into the carbs found two split diaphragms!

be nice if it was just stale petrol hey?