high temp silicone as exhaust o rings?

7 replies to this topic
  • nwsmith89

Posted April 29, 2012 - 06:26 PM


just as the tittle says does it work?

  • dhdrider

Posted April 30, 2012 - 07:49 AM


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.

  • nwsmith89

Posted April 30, 2012 - 05:34 PM


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

  • Mudhand

Posted May 12, 2012 - 02:56 PM


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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  • JoeMcLaughlin

Posted May 12, 2012 - 07:25 PM


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.
Extra large link: http://www.tripleate...-1/DSCN9839.JPG

Posted Image

  • highmarker

Posted May 12, 2012 - 07:56 PM


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.

  • SAthump

Posted May 13, 2012 - 06:57 AM


+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.

  • SkiDaddy

Posted May 15, 2012 - 11:45 AM


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


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