Question about 2000 BMW R 1100 R

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Spark o guys, need a bit of advice on the best way way to fix my spark plug threads. the plug goes in like halfway, then starts to tighten, but never fully tightens, just turns. should i run a thread chaser thru it? tap it? helicoil? and my followup question, whats the best way to prevent whatever metal shavings that u get, from falling into the cylinder?

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You're going to need to helicoil it. If you can flip the engine upside down. If you can't do that, then apply grease to the drill bit, then the tap when you're cutting the threads. Go very slowly. Alternately snap-on and MAC tools make specially designed thread cutters that compress, go into the hole, then expand outwards to cut the threads. They have little cups to hold the shavings, but cost about $100 each.

Posted on Nov 20, 2008

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They're better than heli-coils, because they give full thread strength.
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But it it's something that you'll remove and reinstall time after time (like a spark plug, or a drain plug), eventually the heli-coil starts to UNcoil on you.

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1 Answer

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RPM Northwest

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