I burned out a spark plug head on my Honda 600 sport bike and was sure it was taken care of but decided to rethread the hole with the coil. The plugs are in 8 inch deep holes and there is a bar over the holes so access to the plug hole was difficult. I bought a drill bit and spiral coils but I needed a 90 degree drill bit and there was no way to keep the drill bit aligned to redrill the hole cleanly then I would have to thread and coil the hole somehow. Then I saw this one kit and it solved all those problems. The stepped tap screws into the cork hole so that it aligns perfectly when the tap is larger. All I had to do was turn the tap all the way to thread the hole and suck up the shavings. The coil insertion tool worked great and the cutting tool placed the top of the coil spool flush with the head. I put the plugs in and put everything back together, after the repair I rode the bike 3000 miles and it works perfectly. This kit saved me from buying a new bike considering the cost is negligible.
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