Constant misfire ??????

[JohnD]

Never forget...if you think it is ignition it is probably fuel - and vice versa.

 I had a misfire that plagued the mag engined cup model for a few years, i was convinved it was the ignition, i had the mag rebuilt, and changed plugs for warmer, colder etc etc and it made no real difference, i was truly at my wits end with it.

Mr Dunford from Alba Austins offered to have a looked, and with a fresh set of eyes, within half an hour it was disagnosed that a very small twig had found its way into the carb needle and was restricting flow - removed it was back to normal. 

 I was convinced it was electrical as anytime you took the carb off, it was full of fuel, it would start and rev ok and was only when driven hard it would misfire, which was then when it was warm and so i was convinced somthing electrical had broken down!

I would speak with the builder as its more than likley be somthing small and trivial like my issue