I recently stripped the threads on a Honda CT70 minitrail. I purchased a steel thread insert (not a helicoil) from the local hardware store. basically what you do is drill out the stripped threads to the correct new size indicated on the insert and then tap it out to the tap size also recommended. I did use JB Weld only to lock the threads in the new hole. this should work even better on you ped because you don't have valves to worry about. It has worked perfectly with no apparent loss of compression. All of the above was done with the head removed. personally I think this is a better alternative than purchasing an expensive new head. Also, I have not heard much positive commentary about the 70cc kits. Be VERY careful with that plug barely in the head. I have seen plugs fire out of the head with some dangerous velocity. Hope this helps!