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Discussion Starter #1
So I open my airbox and see there is a nice film of oil on everything. And the back end of the air box is a bit damp with oil. I raced the bike all last year and never had this issue. I don't overfill my oil so I am kinda puzzled as to why this is happening. I have the pair system in place and have the oil breather tube hooked up to the airbox (hence the oil). I am wondering if there might be something else going on with the motor, causing excess pressure internally and causing the oil to get into the airbox? The oil I am running is Motul double ester 300V.
 

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Probably condensed oil vapor or residual oil from an aftermarket air cleaner, has the bike been stood for a while ?
 

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Discussion Starter #3
Nope, bike hasn't been sitting for a long time. I am using a stock air cleaner. Other than overfilling the oil what else would cause the extra oil to go into the airbox?
 

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A lot of high performance engines do this , sometimes it is noticeable sometimes not depends on how you last rode it normally.
If you have done a sustained ride at high ambient temperatures I would expect to see it , and also short rides before engine temps have reached optimum.

There are several scenarios.

Blow by from a lot of detonation increasing windage and oil temps.
Blow by from cooler cylinder temps (heavy use with a cold engine)
Increased core temperatures from sustained riding and oil vaporisation.
Frothing from excessive slosh (normally track days).
Overfilling.
Constant lean angles.
Wheelies.

Like I say , it probably does it a lot of the time but most of the oil is consumed and the airbox remains dry, sometimes its just a case of how you put your bike to bed from a days riding.
 

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Discussion Starter #5
A lot of high performance engines do this , sometimes it is noticeable sometimes not depends on how you last rode it normally.
If you have done a sustained ride at high ambient temperatures I would expect to see it , and also short rides before engine temps have reached optimum.

There are several scenarios.

Blow by from a lot of detonation increasing windage and oil temps.
Blow by from cooler cylinder temps (heavy use with a cold engine)
Increased core temperatures from sustained riding and oil vaporisation.
Frothing from excessive slosh (normally track days).
Overfilling.
Constant lean angles.
Wheelies.

Like I say , it probably does it a lot of the time but most of the oil is consumed and the airbox remains dry, sometimes its just a case of how you put your bike to bed from a days riding.
I only race this bike so all riding is at the track. The frothing and constant lean angles could definitely explain it. I race at WSIR and a good portion of the track has to be ridden leaned over on the right side with RPMS pretty high most of that time.
 

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Ok here is what happened to me this weekend I dont have my crankcase hooked up to my air box it is actualy hooked to a hose that runs up along the side of my subframe on the right then has a breather filter hooked.
Well after hitting the mountain I pulled off waiting on friends and Poof bike starts smoking.Oil had reached the breather filter and leaked out dripping on the exhaust causing smoke. THIS HAS NEVER HAPPENED BEFORE -- so I wiped off the excess and allowed the bike to idle afterwards and no more issues.

All I can think of is that the elevation change and curves caused the crank to burp hard
Any ideas to this would be great
 

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this is common in the zx10r, just do like some have posted, remove it from the airbox, seal airbox, run a line up to the reat tail of the bike and put a breather on it if you like. cased by increased crank pressure from changing rpm's, more common in engines with raised compression and or engine mods
 

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So what you're saying is that the burp on my bike with the breather tube running up my subframe is normal and yes my bike is heavily modded -- Cause when it happened it scared the hell out of me at first I thought I had grenaded my motor but it was oil comming up and out the crankcase breather tube which has a mini K&N filter on it
 

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yep

So what you're saying is that the burp on my bike with the breather tube running up my subframe is normal and yes my bike is heavily modded -- Cause when it happened it scared the hell out of me at first I thought I had grenaded my motor but it was oil comming up and out the crankcase breather tube which has a mini K&N filter on it
YEP!!
 
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