Exhaust Bolt Size & Pitch?

[mmattockx]

My dumb question for the day... What size and thread pitch are the exhaust bolts on my 82 1100E?


Thanks,
Mark

[hannibal]

You can use the part number to determine bolt size. The part number for the exhaust bolts is 07130-0840B so they are M8 x 40mm. Pretty sure they are standard pitch (1.25).

[cowboyup3371]

It will be a bit easier to switch to studs with nuts on them too

[AMK]

It will be a bit easier to switch to studs with nuts on them too

Brass nuts if you can find them.

[mmattockx]

It will be a bit easier to switch to studs with nuts on them too

I had studs and switched to stainless socket head cap screws. I'm much happier with the SHCS than the studs. I thought I had one thread that had picked up on me the last time I pulled the exhaust to change oil but everything looks OK at the moment and I don't need to track down a tap for it.

Thanks to hannibal for the info.


Mark

[MechMessiah]

I also recommend switching to studs. There's a really great seller on ebay, Jons Auto shack, that sells nice stud sets. He even includes copper anti-seize packets with every order.

[hannibal]

I'm switching to stainless studs and nuts. I've heard a lot of different advice on anti seize and LocTite, but I'm planning to use LocTite Red on the studs.

[derwood]

It will be a bit easier to switch to studs with nuts on them too

I don't understand what is easier about studs,

personally, I prefer allen head bolts. very easy to start with a socket and wobbly extension. ( I remove my exhaust at least once a year )

stainless nuts really like to seize on stainless studs, that turns them into bolts no matter what loctite you use

[cowboyup3371]

I don't understand what is easier about studs,

personally, I prefer allen head bolts. very easy to start with a socket and wobbly extension. ( I remove my exhaust at least once a year )

stainless nuts really like to seize on stainless studs, that turns them into bolts no matter what loctite you use

Not if you use anti-seize on the section you put the nut on and loc-tite on the end into the engine head.

[JTGS850GL]

I don't understand what is easier about studs,

personally, I prefer allen head bolts. very easy to start with a socket and wobbly extension. ( I remove my exhaust at least once a year )

stainless nuts really like to seize on stainless studs, that turns them into bolts no matter what loctite you use

The advantage of the studs, beside simplicity of exhaust removal, is that the studs don't wear out the aluminum head threads every time the exhaust is removed. Alignment of the exhaust is simpler on re-installation as well. Stainless steel will work perfectly well if a high temp anti-seize is used on the threads going into the head.

[hannibal]

I agree with all of the above except anti seize on the studs in the head. Why not loctite? The studs are meant to be permanent per your explanation while the nuts are the removable bit. Why not loctite in the head and anti seize on the nuts?

[hannibal]

I see an advantage when it comes to allen head vs screws but the OEM exhaust bolts get the job done well enough. It's just torquing them and loosening them adds strain on the threads in the head.

[Agemax]

loctite the studs, anti sieze on the nuts

[derwood]

loctite the studs, anti sieze on the nuts

FYI, try not to use stainless on stainless, it may gaul and will not come apart.

studs being easier, I agree to disagree on that.

there seem to be many more threads of aggravation, drilling out broke studs and bolts than repairing worn out holes,

[Agemax]

FYI, try not to use stainless on stainless, it may gaul and will not come apart.

studs being easier, I agree to disagree on that.

there seem to be many more threads of aggravation, drilling out broke studs and bolts than repairing worn out holes,

Anti sieze on stainless nuts, on stainless studs will not be a problem. Certainly hasn't been on mine for over 15 years.