2001 yz426 valve cover

3 replies to this topic
  • 09speeddemon

Posted June 19, 2010 - 08:24 PM


Ok guys i have a 2001 yz426 Today i took it for the very first ride since i bought the bike. Well today i noticed there was oil leaking out of the valve cover vent tube why is this??? The bike is not running hot and the bike runs very strong.

  • grayracer513

Posted June 20, 2010 - 06:46 AM


The big 12mm tube that runs down the frame? That would be somewhat normal if you mean that there's a drip or two coming from that, especially when you run it hard. It's the crankcase breather. Things that could result in an excess of oil expelled would be a fairly gross oil overfill or weak rings.

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  • Ryan426

Posted June 20, 2010 - 07:19 AM


When I first got my 426 I took it out to ck the oil while it was cold and thought it needed it some. Added a full qt. before it read on the stick. Found out that I read it wrong. Warm it up first then check oil after you shut it down:bonk:

  • 09speeddemon

Posted June 20, 2010 - 07:41 AM


I noticed it was leaking quit a bit ( it looks like a lot to me) every time we would stop riding and take a break for 5 mins i would see about 3-6 drops and a little oil on the frame.

Thanx for the help

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