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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #11  
Old 4th June 2020
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rejeanprimeau rejeanprimeau is offline
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I've welded numerous sparkplug holes, the main reason of those bad stripped holes was lubricant. Once, the hole was eaten like an EDM has done it. The plating of the plug is chosen to act as a dry anti-seize. Anti-seize can act as a conductor, a bit too much and here go the coil.

Finger tight then the socket.
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  #12  
Old 4th June 2020
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by 60Gunner View Post
It's my understanding the NGKs are coated?
Yes they are. Champion (and others) are also. Multi-layer plating apparently. On the other side the FSM says to use anti-seize. Pick your poison I guess. I choose to use anti-seize. Maybe it's an "old habits" thing.

I think the vast majority of spark plug holes I heli-coiled on customer bikes had the threads came out with the plug. Galled threads, or they'd been cross threaded.
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  #13  
Old 4th June 2020
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is the White tip due to heat damage ? As this has only appeared since me starting to use higher speeds ...
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Who'd'a thought. 60Gunner and me agreeing.
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That's twice in 1 month. ;p


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