Exhaust heat shield screws, how deep??

[Guest]

On my '81 GS750L the two small heat shield pieces (under the front foot pegs) are only hanging on by one screw each - the other has been snapped off by the PO. The rattling noise is driving my crazy!!!

I am going to have to drill them all out in order to do a proper fix and I want to know how deep they are? I've tried PB Blaster on them for a couple of weeks, along with the heat from the exhaust: no dice, they won't budge.

So I'll be drilling out all 4 but would like to know the hole depth before I drill right through the exhaust!!

[Steve]

3, maybe 4 mm.

.

[Guest]

3, maybe 4 mm.

.

So, less than 3/16" deep - that aint too deep. Shouldn't be too hard to drill them out. gonna need a finish tap though...

[Tom MLC]

I just replaced 3 of my screws on my GS1100E. They were M5 x 10's. I also used a flat and a lock washer for each. Good thing I did, b'cuz the 10mm length was just a tad long.

BTW, I don't see any problem with drilling deeper. So what if you bust through into the pipe? The screw is gonna seal it up. For what it's worth, I did this on my GS1100L. Busted the screw. Had to drill & tap. I just went all the way in.

[rphillips]

I'd find a left hand drill, The heat & vibration will sometimes loosen the twisted off screw & turn it right out. If it doesn't, you still have a hole. The hole doesn't know if it was drilled lefty or righty. Just my opinion.

[Guest]

Thanks guys, this will be my next project...

Mike