Question about 2002 kawasaki ZZR 1200

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Oil in airbox

I have oil in my air box how do i stop this problem, ialso found that there are two lines that run down beside the bike with plugs in them can i drain them.

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  • Patrick Dennehy May 11, 2010

    These lines just dead end somewhere? Are they oil lines, or do you know?



    Back to your original question: Unless you have clogged crankcase ventilation, I would suspect the bike is overfilled with oil. Did you change it yourself, do you know it has the proper amount? Otherwise excessive blowby, or a mismatched exhaust system to jetting could cause oil backing out of the carbs, but I assume you have looked for other entry points for this oil, right?

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Sounds like your getting alot of crank case blow by   or the engine is over full with oil  may also be in need of oil change  these will all cause this to happen  is this a high milage bike  it to can  cause blow by  

Posted on Feb 16, 2009

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Since the bike laid on its side all night,oil got into your top end and just needs to be run till all oil is cleared out.Clean the air box and anything connected to it.The breather from the crank case runs to the air box,that's why there's oil in it.Should only be a fine mist when running.This is the bottom ends only way to breathe,piston goes up,pulls air in from breather hose.Piston goes down,makes pressure and has to have a means to releave that pressure from the cases.This is how the bulk of bigger bikes are set up to opperate.Just laying on it's side for any length of time won't hurt anything other than what I just said.Takes a bit of time for it to finally clear all oil from tha breather system,and you'll have to change your plugs a coupl of times.Use NGK's that burn oil.

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I think what you are looking at is the crankcase vent line.....the blowby gases from the engine flow into the airbox to be burnt with the incoming air.
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Do you know exactly where the oil is coming from? Remember the bike has an oil cooler at the front, could you have disturbed a connection and its running down the pipe?
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This hose should be connected to the air filter box.

It's for ventilation of the crankcase, much like the PCV (Positive Crankcase Ventilation) in cars. As the bike runs, the crankcase gets hot enough to vaporize some of the oil. And since there's always at least a little bit of combustion blowby in the cylinders, you get a bit of fuel/air thrown into the mix and an oil/fuel/air "atmosphere" in the crankcase, which isn't an ideal situation. So, when the hose is connected to the air filter box, it slightly vacuums off this atmosphere, letting the engine burn it and expel it through the exhaust.

If it's not connected to the airbox, the vapors can condense back to oil and just drip out.

If a lot of oil is coming out ("a lot" is hard to quantify), you could be getting excessive blowby because of a broken ring or cracked piston.

Hook that breather line back up to the airbox and unless the bike smokes excessively, I wouldn't worry about it.

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