My pinto sounded tappety when she had been stood a long time. Took her out for a good thrash soon sorted it out. Change the oil put some cheap 10/40 in fit prop give her a good rag up and down the road let it idle til the fan kicks in then see if its still tapping. If not put good oil in if tapping rag it some more. If it gets worse after a rag call it a day and swap the engine its the cheaper option.
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