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Either the guide fitment in the cylinder head, or the guide/valve clearence.
It could also be migrating over the firelip from the oil drain.
Dissassembly and inspection will tell all.
Scott
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"If a street Harley doesn't have torque, how much horsepower it makes, simply does not matter."
"Treat your dogs with respect, keep your traps oiled and checked, and Beechnut is the tabacco to chew." The Renn, date unknown.
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