That quote from JHS Racing sounds deeply worrying. Piston slap is caused by the bore becoming out of round, and this is mostly caused by leakage past the piston rings. Now why would that be? Are they not measuring everything correctly? Are they using the wrong honing grade for the rings? The wrong break-in procedure? If the kit is fundamentally flawed by design then why are they taking hard-earned cash from people to do dodgy work?
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