Oil leak out of breather tube!



10 replies to this topic
  • jon333

Posted February 10, 2016 - 08:43 AM

#1

I have a 2009 yz450, fresh rebuilt about 10 hours ago. Did some hard riding last night and laid it down pretty good and sat there for about a minute while running. Went home after and Parked it, all was running fine just like normal. When I parked it like 4 drops of oil came out of breather tube, is this normal or should I be worried. It's never done this before.

  • CSAR FE

Posted February 10, 2016 - 09:16 AM

#2

I had the exact same experience verbatim with my 16 yz450f this weekend. I don't think it's a big deal.

  • grayracer513

Posted February 10, 2016 - 10:28 AM

#3

Entirely normal



  • Edge316

Posted February 10, 2016 - 10:34 AM

#4

It's normal.....usually due to being over filled with oil. Both the yz250f and yz450f seem to be sensitive in regards to the correct oil level.Over fill them even alittle and they leak. Our 2016 yz450f doesn't leak to much but or 2016 yz250f does it all the time...our 2014 yz250f leaked too.

  • grayracer513

Posted February 10, 2016 - 10:37 AM

#5

You don't need to overfill to get this behavior, although that will exaggerate it.  All that's required is to ride it hard. 



Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • jon333

Posted February 10, 2016 - 11:15 AM

#6

Thanks guys! Appreciate it! Thought Maybe blew a piston ring or something.

  • Edge316

Posted February 10, 2016 - 06:47 PM

#7

You don't need to overfill to get this behavior, although that will exaggerate it. All that's required is to ride it hard.


You're probably right but I will say this...on my kids 250f if I keep the oil level right in the middle of the sight glass we don't get too much dripping out the breather compared to if its at the top of the sight glass. On my 450f I hardly ever get any drops coming out the breather tube but then I'm old, slow, and don't ride to hard anymore!!!

Edited by Edge316, February 10, 2016 - 06:53 PM.


  • Jdav262

Posted February 11, 2016 - 05:38 PM

#8

Oil is slingin everywhere in the case when u ride a little bit will come out sooner or later

  • Hammbone2

Posted March 08, 2016 - 06:22 AM

#9

I have a 426 2001 that blowing oil out the pcv valve. I'll ride 20-30 min. and I'll be down 1/2 a quart. It there anything under the valve cover that needs to be looked at? And does the engine have to be pulled to get the valve cover off to take a look? This bike is new to me. I know it's not burning oil. Any Ideas Fellow Thumper Riders?



  • Jdav262

Posted March 08, 2016 - 09:46 AM

#10

I have a 426 2001 that blowing oil out the pcv valve. I'll ride 20-30 min. and I'll be down 1/2 a quart. It there anything under the valve cover that needs to be looked at? And does the engine have to be pulled to get the valve cover off to take a look? This bike is new to me. I know it's not burning oil. Any Ideas Fellow Thumper Riders?


Head or base gasket could be blown, as far as taking the engine off i try to do as little as possible you should be able to get in there without removing the engine

  • grayracer513

Posted March 08, 2016 - 11:06 AM

#11

Overfilling is the most common cause of this.  Be sure you check the oil level only after the bike has been run for at least a minute, and within 5 minutes of shut down.  The breather is a simple 12mm hose, no valve of any kind, and very little baffling.  Nothing to really inspect. 

 

You can completely disassemble the entire top end in the bike. 







Related Content

 
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.