oil out of the exhaust?

5 replies to this topic
  • tetondrtbag

Posted May 22, 2008 - 05:01 AM


my wr400 is blowing little tiny specs of oil/soot out of my exhaust.
any ideas?
it started at the end of last summer

  • grayracer513

Posted May 22, 2008 - 05:55 AM


If it really is, it should be smoking. No?

  • Kasjok

Posted May 22, 2008 - 06:11 AM


Could it be actually water from washing it?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted May 22, 2008 - 06:17 AM


Chunks of crud from the interior of the exhaust flaking away is most likely in the absence of any smoke. Part of that could be due to water, yes.

  • Twistedtrik

Posted May 22, 2008 - 06:32 AM


Carbon build up maybe coming loose? Might be something to look at.

  • matt4x4

Posted May 22, 2008 - 07:06 AM


The only thing I could see possibly giving you unburned oil coming out the pipe would be the exhaust valve guides wearing and oil running past them onto the valve, and the exhaust gasses blowing it out, however, oil is pretty sticky and one would think it would deposit on the carbon in the pipe before exiting out the back....
Check your packing like stated before.

Related Content


2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.