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hi everyone, my honda z50r needs piston rings...and i figure why im at it should i put in a big bore kit??? it would be an 88cc, If you think i should, would high performance 20mm carby be ok to use with it?? And should i use stock head or buy new 1...

hi, my 1985 z50r keeps cuttin out on me, sometimes it wont start and then backfires when if finaly does start, smokes black at first....the spark plug is all oily after only like 2 mins of run time, does it need pistn rings???