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Thread: NGK spark plug question

  1. 03-17-2008, 10:27 PM #1
    smvorndran's Avatar
    smvorndran
    smvorndran is offline Just Too Addicted Arm chair racerJust too addicted
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    NGK spark plug question

    I goofed the threads on my 85 YTM225 the other day. The stock plug is a NGK D7EA. The thread diameter is 12mm. Is there any reason why I couldn't drill it out and tap it for 14mm and use a B7ES plug, which is 14mm thread? I believe you can swap a D7EA or a D7ES, so why couldn't I just run a little bit bigger thread diameter. It's almost the perfect save. If that one gets goofed, then I'll need another head. By the way, there's room by the valves, so I shouldn't have to worry about the seats. Any thoughts? I can fixture it up on a knee mill to get it true & round, and power tap it straight thru. I love working at a machine shop.

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  2. 03-17-2008, 10:30 PM #2
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    OldSchoolin86
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    Quote Originally Posted by smvorndran View Post
    I goofed the threads on my 85 YTM225 the other day. The stock plug is a NGK D7EA. The thread diameter is 12mm. Is there any reason why I couldn't drill it out and tap it for 14mm and use a B7ES plug, which is 14mm thread? I believe you can swap a D7EA or a D7ES, so why couldn't I just run a little bit bigger thread diameter. It's almost the perfect save. If that one gets goofed, then I'll need another head. By the way, there's room by the valves, so I shouldn't have to worry about the seats. Any thoughts? I can fixture it up on a knee mill to get it true & round, and power tap it straight thru. I love working at a machine shop.

    smvorndran
    Why not just install an insert and get it back to stock?
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  3. 03-17-2008, 11:02 PM #3
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    300rman
    300rman is offline My other user 3WW ID was Nitebiker07. Teaching quads a lesson
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    yeah, if it gets boogered up again, any machine shop can fix it no problem.

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  4. 03-18-2008, 01:31 PM #4
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    smvorndran
    smvorndran is offline Just Too Addicted Arm chair racerJust too addicted
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    My Honda dealer's going to throw a Helicoil in it for me tomorrow for $10. Problem solved! Thanks.

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