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spark plug life?

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My bike seems to eat spark plugs, it runs fine & is jetted correctly as far as I can tell....I havent managed to get more than 25-30 hours out of a plug before it becomes difficult to start due weak spark...all of which is rectified by a new plug...

Am interested to hear how many hours others get out of their plugs?

Guess I better by em in bullk...

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What bike?

I go a few hundred hours on my plugs usually, and end up changing them just because I think I should, not because of any starting or performance issues. On second plug with my current bike at 500 hours.

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Might be a bad cap too.  Do the plug terminals have a lot of carbon buildup at the top where the cap snaps on?

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