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nwsmith89

high temp silicone as exhaust o rings?

15 posts in this topic

You still need o-rings even if you use silicone. Have you tried over-sized rings? What bike are you talking about? If it's the 250/300, there is an over-sized ring you can use that will typically solve your issues w/o using silicone.

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its a 2000 125 sx. the o rings will be here tomorrow i was just being impaitent to ride ill put sum silicone on with them just to be sure i dont get any leaks thank you for your suggestions

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I use high temp silicone on my exhaust seals and it works great. a thin layer works wonders, don't go heavy.

I have done this on an '09 xc 250 and an '01 yz 250. On the last re-build of the YZ, I could tell the difference easily when using old exhaust seals.

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Running without o-rings is not a good idea. Yes it will work. The problem is the o-rings keep the pipe from beating the hell out of the exhaust flange. It does not take much time to beat the exhaust flange. Here is a pic of the damage you do not want. Mark on ktmtalk sells the o-rings in bulk. I like to buy a bunch so I have plenty and keep them fresh.

Joe........

Extra large link: http://www.tripleateam.com/dirt/d/126237-1/DSCN9839.JPG

DSCN9839.JPG

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high temp wont last at the head pipe, too hot, Might get a ride or two out of it, The orange high temp will turn to powder, the copper silcone has a lower temp rating but leaves more of a gummy residue so sometime can stay sealed longer, I've used teflon tape in conjunction with silicon and orings and that has helped too. Had machines that it was just part of maintenance to pull the pipe every ride.

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+1 on Teflon tape, I wrap some folded between the O rings to build more "cushion surface" then 2 - 3 wraps over the O rings keeping it tight. Works good so far plus not messy and no set up time.

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Red high temp over good o-rings lasts many months.

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I have a 2013 KTM 200 XC-W and unfortunately, my exhaust flange looks like the picture of Joe M's above. Do I REALLY need to get a new flange? Luckily, it looks like it's a replaceable part on my bike. But would rather save the extra $100+  Also, with new o-rings, will that seal up properly?

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I Usually got about 10 hours with the kreft o rings and PC pipe. Hoping to get more with the bills

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10 hours? That's IT? That's 2, MAYBE 3 rides. And then you have to change the O-rings? That seems...not quite right. But thanks for input.

 

Any comments about the scored flange?

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10 hours? That's IT? That's 2, MAYBE 3 rides. And then you have to change the O-rings? That seems...not quite right. But thanks for input.

Any comments about the scored flange?

probably closer to 8-10 rides. I can usually get an hour of hard riding with a tank of gas. Same with racing mx. 2 10 minute practices then 2 15 minute motos.

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Been using it for years, put it on and let it cure overnight .

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Red high temp over good o-rings lasts many months.

 

I use the stuff from Harbor Freight and it last until I take it apart...usually about a year. I put a small bead between the two orings and slide her in. Really helps seal things up there, even when the pipe gets a bit kinked up.

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I have used sealing rope for stove doors , its immune to high heat and comes in different sizes.

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