Engine Oil in Airbox? crf250r

garrettcibak71
Edited Date/Time 8/10/2015 11:29am
I noticed engine oil in my airbox today when I was changing my air filter and have never had this problem before. My bike is a 2012 crf250r and like stated, it's not filter oil, it's definitely engine oil. Anybody know why this is happening and if I should be worried?
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motox11
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motox11 12/12/2014 8:09pm
12/12/2014 8:09pm
That's a breather line that runs from the crankcase into your airbox. Normal for the crf250r. Applied racing makes a kit that blocks that line to the air box and instead uses a billet aluminum filter system off the crankcase and gives you a plug to put into the airboot so that doesn't happen.
Thelen20
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Thelen20 12/12/2014 8:23pm
12/12/2014 8:23pm
I got a ton of engine oil in the airbox on my 04 crf250r when it munched the crank seal, good luck

Note: i had never noticed oil in the airbox before
Paw Paw 271
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Paw Paw 271 12/13/2014 3:36am
12/13/2014 3:36am
9 times out of 10 this is caused by putting too much oil in the engine. I have seen some model bikes that do this new with the correct oil level. It can be corrected by rerouting the breather lines.

Paw Paw

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MotoX85
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MotoX85 12/13/2014 3:39am
12/13/2014 3:39am
Too much oil in the cases. Nothing to do with crank seals. There's an over flow that goes into the air box
ky_savage
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ky_savage 12/13/2014 4:07am
12/13/2014 4:07am
Paw Paw 271 wrote:
9 times out of 10 this is caused by putting too much oil in the engine. I have seen some model bikes that do this new...
9 times out of 10 this is caused by putting too much oil in the engine. I have seen some model bikes that do this new with the correct oil level. It can be corrected by rerouting the breather lines.

Paw Paw
^^^this is what I've seen the most that causes it.
jtiger12
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jtiger12 12/13/2014 5:10am
12/13/2014 5:10am
If you dropped the bike while it was running, you'll get oil in there sometimes as well. Get the breather kit, your bike will run a little better with it.
Redrcr34
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Redrcr34 12/14/2014 11:23am
12/14/2014 11:23am
Thelen20 wrote:
I got a ton of engine oil in the airbox on my 04 crf250r when it munched the crank seal, good luck Note: i had never...
I got a ton of engine oil in the airbox on my 04 crf250r when it munched the crank seal, good luck

Note: i had never noticed oil in the airbox before
Mine was a bad crank seal on my 07 crf250
-espionage-
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-espionage- 12/14/2014 11:34am
12/14/2014 11:34am
If you lay it over and the engine is higher then the air filter it will drain oil out the breather hose into the air box.
rolandk
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rolandk 12/14/2014 11:37am
12/14/2014 11:37am
jtiger12 wrote:
If you dropped the bike while it was running, you'll get oil in there sometimes as well. Get the breather kit, your bike will run a...
If you dropped the bike while it was running, you'll get oil in there sometimes as well. Get the breather kit, your bike will run a little better with it.
+1. Had a minor tip over once where the bike was laying on its side running ~10 seconds before I could pick it up, the air filter got soaked with engine oil.
Idaho747
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Idaho747 8/10/2015 11:28am
8/10/2015 11:28am
So this happened to my wife's bike yesterday. I'm hoping it's just the over flow some of you had talked about.
Idaho747
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Idaho747 8/10/2015 11:29am
8/10/2015 11:29am
Paw Paw 271 wrote:
9 times out of 10 this is caused by putting too much oil in the engine. I have seen some model bikes that do this new...
9 times out of 10 this is caused by putting too much oil in the engine. I have seen some model bikes that do this new with the correct oil level. It can be corrected by rerouting the breather lines.

Paw Paw
What is the best way to re route the breather?

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