Thread: Piston/vaulve smaking the plug??
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Old 03-12-2015, 04:09 PM
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ckau ckau is offline
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Join Date: Dec 2009
Location: central North Carolina
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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.