07 YZ450F Blowing oil out valve cover breather tube


4 replies to this topic
  • crj900pilot

Posted January 12, 2016 - 06:19 PM

#1

My YZ540F started blowing oil out the valve cover breather tube so I had the cylinder honed and put in a new piston and rings and valve seals thinking blow by. Now its blowing out even more. I had a puddle after 16 sec of running. Any ideas???  Thanks



  • grayracer513

Posted January 12, 2016 - 09:05 PM

#2

Oil overfilled?



Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • crj900pilot

Posted January 18, 2016 - 02:05 PM

#3

Its def not over filled. Anyone ever heard of a cavtating oil pump doing this?



  • drtrcr400

Posted January 18, 2016 - 06:23 PM

#4

As long as the oil isn't over filled you still have blow by. No two ways about it.

Edited by drtrcr400, January 18, 2016 - 06:25 PM.


  • grayracer513

Posted January 18, 2016 - 09:15 PM

#5

Its def not over filled. Anyone ever heard of a cavtating oil pump doing this?

 

Not cavitating, no.

 

Check this: If the dip stick is loosened or removed, will oil come from the dip stick hole? 







Related Content

Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Forums
Photo

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
Forums
Photo

First Hare scramble tips by dhend8


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

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride


Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies
 
x

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.