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#6017
Stan Thomas
Participant

Hi Erik

Re your backfire through the carb.

Sounds like a bad case of a very weak mixture.

Assuming the bike starts O.K. then it does not appear to be air leaks at the joints or crankshaft packing glands etc.

Try checking the needle position – it should be the middle notch 9but it’s not that critical. Also try closing the air leaver when the backfire occurs and see if the rich mixture cures your problem.

I dont know what carb you have – but later 3 point fitting Amal ones with seperate float chambers meant you couldvary the fuel level. Start off by checking the float is at right-angles to the body.

Regards,

Stan Thomas.