Stripped threads for valve cover bolt holes in head. 1980 KZ250

[brieweb]

I have a 1980 Kawasaki KZ250. After adjusting the valves, I was putting the bolts into the valve covers and I stripped the threads in the head for the hole that the bolt goes into. How do repair the threads?

brian

[oldcoldankles]

Hi brieweb and welcome to the forum. Timeserts are probably your best bet:
http://www.timesert.com/

[techy]

Agree! Those are much better than heli-coils.

[wiredgeorge]

While they may be a lot better than Helicoil, they are also many times more expensive. I use Recoil inserts because of their function and reasonable cost. You will need 6mm inserts. These come in "kit" form. Any insert kit will contain a tap for cutting a new threaded hole. You will also an install tool for putting the insert in the hole. Some insert kits will also give you a drill bit for pre-sizing the to-be-threaded new hole and of course, a handfull of new inserts. Again, 6mm inserts and no more than 15mm length of so. The kits will have inserts in different lengths depending on the manufacturer. I would spend the money on Timeserts for plug thread but not case screw/bolt hole repair.