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Cb750 misfire

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750rideruk:
OK
Engine top end rebuild clean carbs, new plugs, carbs balanced, timing spot on but have a misfire. Bogs down over half throttle and pops on overrun as if the exhaust is leaking.
The only thing I can find is that the rubber bellmouths are not a great fit into the air filter casing as they have shrunk with age.
Any of the experts out there with any clues?

Trigger:
Is the popping coming from the airbox ?

750rideruk:
Thanks for the reply Trigger
No the backfire is through the Zorst mainly

Bitsa (Ralph Wright - RIP):
What have you set the air screws at from fully closed?Did you change all the moving carb parts what else have you done? More info please? :D
Cheers
Bitsa

750rideruk:
air screws 1 1/2 turns out.
Carbs partially  stripped cleaned rebuilt and balanced

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