Exhaust paste..

[bmwsport]

Guys,

I've got to refit the exhaust on my rs125, is there a particular type of exhaust paste/sealant stuff your meant to use of will any dedicated exhaust paste be ok?

Cheers.

[stirlinggaz]

Hi,
as long as you have the exhaust gasket, sealant isnt a neccessity.
but no harm in using a little ordinary high temp exhaust paste.
i think it even says to do this in the workshop manual, but i can honestly say i have never used it on an rs.
with a new gasket & a clean mounting stub/manifold,& tight springs, i have never seen the need for it.
especially on the more expensive exhausts like the jl, where the manifold fits onto the cylinder & the exhaust like a glove.
self sealing with built in o-rings- no leaks whatsover.
cheers,
GAZ

[finpos]

Exhaust paste is 100% utterly useless for making joints. It sets hard, so within weeks the vibration in the joint breaks it up and it falls out. There's now a space where the paste was, i.e. your exhaust is leaking.

Use proper gaskets, if you must fill some inexplicable voids, use high temperature silicone, or silicone bathroom sealant at a push. Choose a pretty colour, obv.

f.

[stirlinggaz]

hi,
i presumed he was talking about coating the surfaces around the gasket area.
not instead of a gasket.
which is why i recommended high temp sealant. flexible stuff would be better obviously, but tbh i dont see the need for ANY sealant, with a decent gasket & springs.
cheers,
GAZ

[finpos]

I presumed that too. It's not what exhaust paste is for* and it'll fail either way

f.

* Exhaust paste is for selling to gullible people that think it can plug holes in terminally rotten exhausts, thus increasing the profitability of Halfords.

[bmwsport]

Hi guys,

Ok cheers, my exhaust is an Arrow item, which on my bike slides over the manifold stub, its quite snug and theres no signs of soot etc around the manifold, i just want to put it back together properly and to make sure there are no leaks.

[NSR Mick]

Leave it clean, a slight leak on it is fine. I get i bit of soot leaking out of mine.
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[temeluchus]

you can use a little coppaslip if you need a bit of lube for assembling.
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[Vincent]

For any sealant on two stroke exhausts that's needed around the flange, use Permatex "Ultra Copper" high temp silicone sealant. I think the stuff finpos is talking about is "Exhaust putty" which is pretty rubbish.

https://i77.photobucket.com/albums/j71/Drewskovitch/Permatex.jpg
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[bmwsport]

cool thanks vincent,

Is that stuff available from most diy places?

[finpos]

Just to be clear, if you spend £2 on a new gasket, it won't need sealant and it won't leak.

f.

[bmwsport]

Thanks.. but i don't think there is a gasket.. i'm not talking about the manifold here..

[finpos]

You could have said!

Generally, there will be a gasket at any joint, you only need to revert to silicone* if it's bodged and/or broken. If it's a sleeve joint (one tube fits up inside another) it should be so tight when it's clamped that it won't need sealant anyhoo.

f.

* Seriously, if it's towards the back of the exhaust where it's a bit cooler, any decent silicone from B&Q will hold out fine. You'll need to find a motor factors (or chimney installer!) for the high temp stuff.

[bmwsport]

[stirlinggaz]

hi,
you dont need anything between those 2 parts.
should slide together & fit snugly.(as long as there both clean)
decent springs will hold them together.
(which is why the springs are a c*nt to hook on, lol)
cheers,
GAZ

[mapex]

Any tips on getting a tight gasket into place....mine just
wont go in its so tight
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[Ichy]