Exhaust Gaskets

**Sat Jan 07, 2006 2:14 am » Post: #1 » Download Post**

Do these need to be replaced now that my pipes are off? I have just cleaned them and there was a whole lot of carbon packed in the gap within the metal ring - not sure if there was a rubber o-ring or something in there. Thanks for any advice.

p.s. Picked up a new (used) cylinder head for $20 so now just waiting on a rebuild kit from Tyga...
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'87 MC16

**Sat Jan 07, 2006 2:23 am » Post: #2 » Download Post**

They can be reused if they aren't too compressed. You can usually use them a number of times over.

Don't worry, there's no o-ring that's supposed to live inside them! Smile

It won't hurt to use a little high temperature RTV sealant on them for good measure when you reassemble the exhausts.
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Andy.
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**Sat Jan 07, 2006 5:16 am » Post: #3 » Download Post**

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'87 MC16

**Sat Jan 07, 2006 7:04 am » Post: #4 » Download Post**

Andy wrote:
It won't hurt to use a little high temperature RTV sealant on them for good measure when you reassemble the exhausts.

any idea where you get this from?
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
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**Sat Jan 07, 2006 10:36 am » Post: #5 » Download Post**

RTV (room temperature vulcanized) just means it cures in open air at normal temps, this one claims to go to 300*c.
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**Sat Jan 07, 2006 10:58 am » Post: #6 » Download Post**

would normal silicone sealer work do we think Question

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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

**Sat Jan 07, 2006 3:21 pm » Post: #7 » Download Post**

Because of the location, I think it is better to use a "high temperature" RTV silicone sealant. Here in the States at least, Permatex makes one that is widely available at auto parts stores. A moto-shop that caters to dirt bikes would also likely have something suitable. Hope that helps.
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-Jim
'93 MC21

**Sat Jan 07, 2006 3:22 pm » Post: #8 » Download Post**

I'll find out soon enough because i am not taking the exhausts off again. Very Happy

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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

**Sat Jan 07, 2006 4:08 pm » Post: #9 » Download Post**

This is what I used:

http://www.permatex.com/auto/autouh.asp?automotive=yes&f_call=get_item&item_no=81878

**Sat Jan 07, 2006 5:08 pm » Post: #10 » Download Post**

yep, that's the one I use too - seems to do the trick.
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-Jim
'93 MC21

**Sat Jan 07, 2006 8:56 pm » Post: #11 » Download Post**

You guys have so little faith! Isn't that what the gasket is there for in the first place? If you look closely these rings look to be bimetallic Idea

- I'm guessing the copper inner portion would expand under heat (more so than Aluminium) and produce a very good seal. Why put on extra sealant that just has to be cleaned off the next time you pull the pipes off?
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'87 MC16

**Sat Jan 07, 2006 9:05 pm » Post: #12 » Download Post**

Well, of course you may be correct! Honda never uses sealant on the gaskets, but then again they aren't re-using them are they?! Wink

If you use brand new gaskets, and the mating surfaces are as Honda intended, then yes, assemble them "dry".
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Andy.
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**Sat Jan 07, 2006 9:25 pm » Post: #13 » Download Post**

Ahh but i fitted new ones as my old ones leaked and new ones are quite cheap but the new ones leaked,yes i did fit them poperley and cleaned up the exuausts and barrels.I should have used sealant in the first place Mad

**Sat Jan 07, 2006 9:40 pm » Post: #14 » Download Post**

nsr.wayne wrote:
Ahh but i fitted new ones as my old ones leaked and new ones are quite cheap but the new ones leaked,yes i did fit them poperley and cleaned up the exuausts and barrels.I should have used sealant in the first place

I don't think they were genuine Honda ones then! The Honda ones are about UK£12 each! Rolling Eyes

That ain't cheap in my book, not for a bloody exhaust gasket!
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Andy.
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**Sat Jan 07, 2006 10:33 pm » Post: #15 » Download Post**

I got them from Apex(it was before you could supply NSR parts Wink

)and they were Honda ones ,they were nice and shiny and came in little Honda bags Razz

,and yes i think they were about £12 each,i din'nt think that was a bad price Cool

but sealer would have been cheaper Mad