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Kx250f spark plug thread repair

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Ok so got my head all re-done and machined with new stainless valve kit, got it back from shop to find threads for spark plug all messed up. Ran a thread chaser and there is enough material for it to snug up, but don't trust it. Has anyone used the heli coil sparknplug repair kits on one of these bikes? Is there enough room so I don't have to pull the head again(I have it running just don't trust it for the long haul). I am a auto technician of 15 years so I have used plenty of these kits on Ford 3 valve engines. Just seeing if the tool will fit so I don't have to tear top end off again

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