Modern Buddy

I have a Blackjack.

I just took off my cracked Prima exhaust. There was no gasket, just sealant.

I just ordered an NCY exhaust from monsterscooter however it doesn't look like the gasket comes with it.

So do I need the stock round gasket or one of the gaskets shaped like the exhaust flange? or both? I have seen prioes from 99 cents to $10 for the same thing so now Im confused haha.

If your engine is anything like my Blur's engine, then the gasket surface on your head should be flat with no recess for a gasket. The exhaust flange should have a recess built into it for a 30.5mm OD ring seal, such as this one found on eBay: http://www.ebay.com/itm/2-GY6-Exhaust-M ... rA&vxp=mtr

You can probably use a "flange" type gasket, but I've never tried it myself so you're on your own there.

Instead of the correct gasket, some lazy people have used a bead of silicone gasket sealant as a (poor) substitute, but this in not a good idea because the exhaust gases are much hotter than the silicone can handle and will burn off leaving you with an exhaust leak.

I did an ncy pipe on a vino 125 and it came with a stock style gasket ring. My prima came with a flange style and it is reusable. I keep both laying around just in case.

I've used both types with my Prima exhaust and currently have a spare of each sitting in my tool cabinet. The pipe has to come off when doing a tire change and I prefer to go with a new gasket (they're cheap!) rather than re-using the old.

Both seem to work OK.

Thanks for the replies! So it seems either will work?

My Buddy 125 came with no gasket or sealant. I was surprised to find that out at 6,000 miles when I changed my rear tire. I didn't have a gasket at the time, so I bolted it back on as-is.

I ordered an NCY performance exhaust and it didn't have a gasket. But, by that time I had some spare gaskets on hand. I used one that looks like the flange. It doesn't sound right to me after installation though. It sounds like there's a leak, but I can't find one. I chalked it up to the new sound of the performance pipe.

Xsolusx wrote:Thanks for the replies! So it seems either will work?

That would be my experience, at least. The best advice I can give you is as you are tightening down the nuts, to do each nut a little at a time. If you first cinch down one nut while leaving the other nut loose the gasket will not be evenly compressed and may leak.

HowHH wrote:

Xsolusx wrote:Thanks for the replies! So it seems either will work?

That would be my experience, at least. The best advice I can give you is as you are tightening down the nuts, to do each nut a little at a time. If you first cinch down one nut while leaving the other nut loose the gasket will not be evenly compressed and may leak.

Sounds good. I just ordered 5 just in case haha.

Just for good measure, I like to put a little bit of anti-seize grease on the threads of the exhaust manifold studs before installing the nuts. Will help prevent corrosion from freezing the nuts onto the studs in the future.