Thread: Twin Plug DIY?
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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,622
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I've just about finished the first head. After starting to machine through the fins I decided to go with the 12mm plug. It was just too scary cutting with an endmill large enough for the 13/16" socket. I cut the pocket with a 3/4" endmill and then followed with a 1" endmill to make room for the 5/8" socket. I should be set up to crank out the remaining 5 pretty quick. Then I'll change the set up and relieve the combustion chamber side with a ball end mill.

Is it worth the trouble? NO, I don't recommend this as a DIY job. Every cut I make makes me feel like I'm taking the final critical cut on something I've spent 20 hours machining.

As for the plug wires, does anyone know a source for matching plug wires to fit the 14mm and 12mm plugs?
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Old 07-10-2004, 11:29 AM
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