Oil leaking

3 replies to this topic
  • Emiliano

Posted September 13, 2005 - 06:42 AM


Hi there everyone, i just need to know this.

I have a 99 YZ400 and it was in the garage for 8 month and yesterday I toke it for a Little ride, it started fist kick everything was correct, but after a few minutes it was stooped it leaked some oil from the vent hose, it was gray, is that normal or should I worry?.

Thanks every one in advance

  • Pincushion

Posted September 13, 2005 - 06:50 AM


Smell any coolant in the oil?

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

Posted September 13, 2005 - 07:08 AM


A bike that sits for that long is bound to get moisture in crankcase and when you mix that with oil, it comes out white. That hose is the valve cover breather hose and not unusual to see oil come out with a little white foam in it if you ride in humid or wet conditions. I would change the oil and ride it some more. Does the oil in the bike have any white foam in it? If it does then you may have a coolant leak, maybe the water pump seal.

I would just change the oil, check the antifreeze level and then ride the bike. Stop once in a while to check the condition of the oil and antifreeze level (careful, it'll be hot). Your bike is most likely fine, just built up condensation.

  • Emiliano

Posted September 13, 2005 - 07:35 AM


Yeah Thanks guys it must be that, I LL change the oil, no coolant smell on it.

Related Content


Yamaha YZ450F 2017 by Chris.GVS

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

BIGBORE FOR YZ450F 2006? by Taattie94

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies

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

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.