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Is it a real backfire or just spitting back?


In my experience, leanness in the carbs will cause more of a spitback than an actual backfire.


The only times I've experienced consistent backfiring has been with clearly failing exhaust components, apart that is from the old Boyer connections syndrome but that is usually much less consistent and more like a case of the blind staggers, usually under load.


Is there any significance in the valve overhaul a year ago ? A sticking valve could cause the problem.


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