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It has an abrasive centerpiece….no idea what it is for.

I have been moping around for a a day contemplating this debacle. Now I can carefully, drill to the bottom and reinstall another coil. Man i don’t care, I didn’t have anything to lose. I hope i didn’t mangle the boss too much. This coil was pretty bomber i just didn't have enough room for the...

I am capable, but not precision machining with serious consequences. What was I thinking? Dont answer lol.

Ye, before I do more damage, i am pulling the head and taking it to the shop. I’m not a machinist or a motorcycle engine mechanic and I am sure as hell had no business trying to do this the way I did it. Thanks for your help to Everyone, happy holidays.. I found four right hand heads on ebay...

Good thinking this through. If the bit was slightly misaligned the bolt would go only so far maybe?

I could have pulled the head off, and used my drill press, but i didnt. I measured the coil, measured the flat spot, and marked the drill Bit As in previous posts.

I think i need the helicoil removal tool. I have a sharpe pick but it isnt giving me anything to grab. I used a drill.

It why i had the bright idea of using the brace but the bit wouldn't fit it…to drill slow and deliberate.

That’s it, it wint ruin what j have already drilled?

Well, everything went swimmingly until reintroduced the bolt into the hole and it wasn't deep enough , after installation of the Helicoil. I might be able to remove the helicoil but then what?

I should have never tried doing this. I apparently didn't drill the hole deep enough. A disaster in so many levels as I see it.

$30. I guess i can use a 6.3mm bit or a 1/4” bit.

I have spent a lot of time reading reviews, one common issue with the helicoil brand is the tang breaks off…it does not come with a drill bit matched to the kit scary…. Thank s for helping…fretting! :(

Ye, i cannot afford to mess this up and i am already seeing who carries the Helicoil brand. I don’t want to say , “you get what you paid for in this case”.

I was just reading your post earlier. Interesting. There is only 14mm of usable thread….i have to see what i get with this inexpensive kit I ordered from amazon…

This kit arrives today. I suppose there isn't much of a rush now since there is snow on the ground, wo if i need a high quality kit, i have time. The helicoil brand was not available, that i could find in Amazon, without a long wait. This had decent reviews. I measured everything so I could plan...

Really? The helicoil is stainless isn’t?

I went back and re-read every post so far. This head has never leaked oil. The two bolts only go in so far before they tighten and can go no further. I wonder if I used a driver to put the bolts back and had it on an unnecessarily high torque setting by mistake. Anyway, this is a very low torque...

Boots or bolt?

I am the original owner of this 1980 cx-500c.