2008 subaru impreza wrx tuner

spark plug conversion from a Harley Davidson 6r12 plug to a Champion?

I want to convert my Harley Davidson plugs 6r12 to a Champion plug but can't find a book to do so
it's a 1999 883 sportster


Don't listen to chopperchopster. He builds choppers out of 350cc Hondas.
You can use a RA8HC or a QL16V S Champion plug.
Ride safe.

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