stripped spark plug thread

[tricky1961]

hi my son just picked up a 140cc bike for next to nothing as it wasent running, we soon found the reason was it didn't have a spark plug cause the previous owner had striped the spark plug thread in the head, my question is can you get some sort of repair kit like a helicoil ect with the head in place or dose the head have to com off it to repair it or do we have to to replace the head thanks richy

 

[xLOCOx]

so you will have to pull the head off... due to if you decide to recut the thread you would get swarf and debris in the barrel.... it may need a new head depending on how bad the thread is stripped... but thats in a case where the whole is too big for the tap to recut the thread (rare case)...
could you chuck a pic up?
cheers loco!

 

[ricky_191]

I did this to a bike a long time ago and end up taking the bike apart, parting it out and keeping some. I didn't have a forum like this for ideas though or ebay lol. Good luck

 

[my67xr]

so how bad is it stripped ?
i have made a tap out of an old spark plug to help correct crossed threads




you can get a helicoil for them, M10 x 1mm, but not a lot of places keep them in stock
they are long enough to do the whole thread length but may get you out of trouble
Helicoil Type Thread Repair KIT M10 X 1 00mm | eBay

and you can also get these from a few Fasteners shops/bearing shops too,

 

[stoozo]

Good idea with the spark plug....mind you that pitpro motor was looking a little cross threaded. May need a helicoil not sure let me know if it does I'll grab one tomorrow or wednesday!