Quote:
Originally Posted by M42
... threw in a new plug. It found the end of the thread without a problem, but I could only finger tighten it 1/4 of a turn before it stopped. Tightened it another turn or so with a wrench. I don't actually remember how far in the plug threads go on the bike, but they probably should go in a little farther when tightening with fingers iirc... turned the bike on, both cylinders worked, warmed it up, seemed ok. Sounds normal...
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That's encouraging! Especially considering the electrode is way up in the threaded hole instead of down lower where it should be.
If I were faced with your situation, I'd try to shove a toothbrush loaded with my favorite solvent down the hole and twist it in hopes of cleaning out the threads the best I could. (May be impossible due to overhead obstructions?). Then I'd put some grease or anti-seize compound on the threads, get the plug started straight, and run it in as far as I could without cranking too tight.
Worst case outcome: If the threads are yacked up, you're in for a helicoil job anyway.
Best case outcome: it goes in OK and you're ready to ride.