Jump to content

  • Follow us:

  • Facebook
  • YouTube
  • Twitter
  • Google+
  • Instagram
  • RSS Feed
  • Google+

Related Garage


Yamaha YZ400F (1999)

Owner: deweym21
Added on October 17, 2016

Related Reviews

Yamaha YZ450F 2009

Last review by w5rjh
* * * * -

Yamaha YZ450F 2011

Last review by Le_Racer
* * * * -

Yamaha YZ426F 2002

Last review by fiddyplus
* * * * -

Yamaha YZ450F 2013

Last review by danoyz450f
* * * * -

Yamaha YZ450F 2006

Last review by Matt Schiller
* * * * -
- - - - -

2006 yz450f smoking and metal shavings -Help

  • Please sign in to reply

3 replies to this topic
  • Yockeypuck

    TT Newbie

4 posts
Location: Illinois

Posted September 18, 2016 - 01:29 PM

So my buddy just picked up an 06 yz450f. We were riding today and all of a sudden it started blowing blue smoke out the exhaust. A pretty decent amount too. I know that means it's burning oil, but what I don't get is why it is burning oil. Supposedly it has 6 hours on a full rebuild- top and bottom. We took it back and drained the oil and took the filter out and there was some metal shavings on the filter. The oil was pretty dirty and dark gray as well, so it must not have been changed since the rebuild.

What's weird is it still runs just fine. Starts easy and idles perfectly. There is a little bit of a knocking noise, but it sounds like the decomp valve. Not 100% sure though.

Could it be the previous owner not breaking it in correctly or what? I'm confuzzled.

  • Slow and Jerky

    TT Bronze Member

433 posts
Location: Washington
Garage View Garage

Posted September 19, 2016 - 04:11 AM

It's not unusual for it to run fine and blow smoke, the oil rings probably failed. 

  • grayracer513
42,666 posts
Location: California
Garage View Garage

Posted September 19, 2016 - 07:12 AM

Noises are a normal part of YZF life, but some of them are abnormal.  Oil smoke is never normal, however, and neither is gray oil.  I'd have the head off and get a look at the bore.  It could be that oil ring was installed wrong (overlapped expander or a twisted ring end) or the bore was worn to the limit and reused anyway.  Could also be valve guide seals, but the symptoms are a little different with them.

  • Yockeypuck

    TT Newbie

4 posts
Location: Illinois

Posted September 19, 2016 - 09:44 AM

Alright thanks grayracer. I'll tear it apart sometime soon and have a look

Related Content


First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  35 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users


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.

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