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Exhaust o-ring
Posted: 05:24 pm Nov 22 2012
by kdxlnt
I need o-rings for my 1990 kdx-200 expansion chamber. From Kawasaki they're about 10 bucks apiece. I'm sure McMaster-Carr sells them for way cheaper, but I don't know what size they are. Could someone please inform me?
Thanks in advance.
Re: Exhaust o-ring
Posted: 05:41 pm Nov 22 2012
by Slick_Nick
Measure the ID you'd need by measuring the groove in your pipe.
Exhaust o-ring
Posted: 08:12 pm Nov 22 2012
by diymirage
dont be afraid to put a bead of RTV sealant on it aswell
Exhaust o-ring
Posted: 09:40 pm Nov 22 2012
by rbates9
If you have the right o-rings then you shouldn't need RTV.
Exhaust o-ring
Posted: 10:12 pm Nov 22 2012
by Mr. Wibbens
If you don't have the o rings just use RTV, it seals up just fine
Exhaust o-ring
Posted: 10:16 pm Nov 22 2012
by Dekon
Don't quote me but I think they are 39mm.
Re: Exhaust o-ring
Posted: 11:15 pm Nov 22 2012
by KDXGarage
Read up on the different types of o-rings made before buying any old o-ring.
Exhaust o-ring
Posted: 10:22 am Nov 24 2012
by kdxlnt
Thanks much for the replies. I'll measure. I know that there is a high-temp material that exhaust o-rings are made from, Viton, I think it's called. If you've never bought from McMaster-Carr, you can get about 20 o-rings for 15 bucks. I'll check it out and report back.
Re: Exhaust o-ring
Posted: 02:54 pm Nov 24 2012
by diymirage
if you do get 20 ill take 4 of them off your hands...asuming you get the right ones ;)
Re: Exhaust o-ring
Posted: 03:06 pm Nov 25 2012
by kdxlnt
I pulled out the old ones from the pipe. I expected them to be halfway destroyed, but they were in perfect shape. I can reuse them no problem. I checked the McMaster Carr website and I was wrong about the price. They're about 5 bucks apiece. I was surprised because I bought a dozen of them for my KTM200 for a lot cheaper. Maybe the size is more common.
Exhaust o-ring
Posted: 11:06 am Nov 26 2012
by kdxlnt
The size of the o-rings I removed are 40mm ID by 3.5mm thick.
Exhaust o-ring
Posted: 08:48 am Nov 27 2012
by K D
kdxlnt wrote:I need o-rings for my 1990 kdx-200 expansion chamber.
kdxlnt wrote:
I pulled out the old ones from the pipe. I expected them to be halfway destroyed, but they were in perfect shape. I can reuse them no problem.
Sounds like you need to check how well the pipe fits into the cylinder it may be tweaked,and or the exhaust port may have some grooves where the Orings seal. I have 4 cylinders and they are all worn where the Orings sit, I always use sealer.
Re: Exhaust o-ring
Posted: 01:06 pm Dec 01 2012
by kdxlnt
I re-installed the o-rings I took out of if along with some red RTV silicone. All is well, thanks.
Exhaust o-ring
Posted: 10:52 pm Dec 01 2012
by rbates9
FWIW, I have a FRP torque ring. With the torque ring it spaces the pipe out to the point that the second O ring can be seen from the out side. And I have never had any leakage from the pipe at the cylinder. Not sure why, but I haven't. I think it has more to do with the pipe fitting squarely into the cylinder with enough spring tension to hold it tight against the copper sealing washer.