Stripped thread on head

[j2tgw]

Hi Ive stripped the head on one of my engines and I'm looking for a helicoil kit to repair it ?
I have seen them advertised on the web but cant seam to find it
Anybody know the thread size ? or where I can get the repair kit
Chers Tom

[waveydavey]

M3 is pretty standard for 50 and 90 sized engines and ebay is your friend, or send it me and I'll do it for you

THREAD REPAIR KIT M3 X 0.5 SUITS HELICOIL INSERTS ETC FROM CHRONOS | eBay

[j2tgw]

Sorry I should have said ! It's not the head bolts that are striped
its the plug! I bought the engine from guy in club and he had put plug
in cross theaded ! And when I took it out it striped
so it's the plug thread that's gone
Tom

[glenflyer]

There is a guy on bmfa advertises threading heads he posts regular

[waveydavey]

What engine is it, I've got some spares kicking about

[Planehazza]

For this reason I ALWAYS turn it anti clockwise a couple of times until you feel/hear it click. You then know the threads are aligned and ready for installing. I do the same with spark plugs.

[davec_7]

Here you go
https://bmfa.org/class1/id/29123