Jonsered 630 stripped muffler studs... fix or big bore?

[J-Red]

Cross posted to the general Jonsered thread...

I’ve got an ‘84 630 with stripped out threads in the head for the muffler studs and am trying to decide on the best course of action...

The saw runs great, you’d never know it was 35 years old- and had a career in the woods before I got it.

I guess my options are:

1. Helicoil and repair the threads
2. Replace the jug and piston

If I replace the top end I’m tempted to go with a big bore kit but will the stock 630 carburetor keep up?

Let me know if any pics might help. Thanks for the input!

 

[Ronie]

If it runs good and your happy with the power it has I would try repairing the threads with some Helicoils or threaded inserts. Or you could tap it to the next size.

 

[grizz55chev]

If it runs good and your happy with the power it has I would try repairing the threads with some Helicoils or threaded inserts. Or you could tap it to the next size.

+1 on tap to the next size!

 

[HiOctane]

Try Helicoil and if the saw got the old 5mm size,go to newer ones at 6mm . And use a muffler bracket,you wont break studs anymore.

 

[J-Red]

Thanks for the input! I think I'll try the threaded inserts first and then weld/retap if that doesn't work. The saw has what I assume is a stock muffler bracket but I've lost the lower anchoring screw a few times and that probably let the studs work loose... I'll be using Loctite there in the future!