Hf 79cc ptv clearance

Mattjb · Jun 20, 2013

I searched but didn't see anything so if this is an already covered topic I apologize.
79cc predator. Current specs of .08 intake and .130 exhaust ptv clearance with the lash set at .006.
My question is whats the minimum ptv clearance required for max rpm (gov removed)? I'm gonna machine the head down, was thinking .030. Thanks for any input from experience. Matt

racie35 · Jun 20, 2013

Increased valve spring pressure would allow less.... You shouldn't borderline it though unless you're okay with a valve slap...I don't think anyone makes a racing can really for those but if they did the ramp profile could change what's allowed too...getting the valve out ta the way sooner. 30 is probably good though

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Hf 79cc ptv clearance

Mattjb

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racie35

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