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Piston/vaulve smaking the plug??
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03-12-2015, 04:09 PM
ckau
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Join Date: Dec 2009
Location: central North Carolina
Posts: 915
you got the right plug? NGK-CR7HS. plug should have a 12.7mm (1/2") reach.
I don't see the crush washer on that plug. If your using it without the washer it is most likely protruding to far into the cylinder thus making contact with the piston.
ckau
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