Yz450f 2014

My bike blows a lot of oil out of the breather tube and it seems like the oil level has dropped alot. Can anyone tell me what it could be??

What conditions are you running in? Take it to the dealer you got it from they should be able to find your problem. If not. I'm sure someone on here owns a 14+ yz450. I own a 2015 yz250f and have never seen that.

Typically more coming out of the breather indicates piston ring wear.  It could be something wrong with the breather setup (hopefully).  

I bought the bike from someone else he said that id had +-20hours on and I've only driven it 20 hours so on 40 hours could it be the rings?? I drive in sandy conditions and the temperature is anything from 28°c to 40°c although i don't ride in the high temps.

What do you mean by the breather setup?

The three most common reasons you see oil exhausted from the crankcase vent are 

 

  1. Lots of high RPM, heavy load operation during the ride (like running in dunes for two hours)
  2. Oil overfilled
  3. Excessive combustion gasses in the crankcase due to worn rings or piston damage

How much oil are you talking about?  A certain amount of it is somewhat normal. 

Some breathers have a type of valve on them (some sort of reed/check valve) that could be causing issues.  

 

During the ride it was somewhat hot and i did have the throttle wide open... On the sight glass the oil dropped about a quarter to the low mark. If the piston is damaged or the rings are worn i would be able to feel a lack of performance right?

Some breathers have a type of valve on them (some sort of reed/check valve) that could be causing issues.  

 

 

There is no check valve involved in a YZF.

During the ride it was somewhat hot and i did have the throttle wide open... On the sight glass the oil dropped about a quarter to the low mark. If the piston is damaged or the rings are worn i would be able to feel a lack of performance right?

 

You might, might not.  But a leak down test will tell you categorically what's wrong, or not wrong, either way. 

Thanks for all the replies I'll have a look.

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