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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2005 1100 vstar oil leakig out of air box

This happens on any bike when it has been filled with too much oil and has been taken on a long run. There is a breather pipe (for air and oil fumes) between the engine and the air filter box. When there is too much oil in the engine it pushes up the pipe into the air box, then drips out where it can. Check oil level properly, ensure bike is level, not on sidestand, read manual on how to check the oil level. If necessary take some out, the easiest way is to do a normal oil change, or repeatedly syringe oil out of the oil filler hole. Then wipe clean the airbox interior and if the air filter is oily change it.

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I have an 1982 suzuki gs g. a few days ago someone bumped into and knocked it over in the night, the next morning when i tried to start it, it almost turned over, but a bunch of blue smoke came out and it...

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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Hi, Noel oil level readings are taken when the engine has reached normal operating temperature and the usual suspects are:
1. Overfilled oil tank dipstick reading should at or below full.
2. If the sight glass is full you are running to much oil.
3. Excessive blowby caused by worn out piston rings.
4. Piston rings never properly seated.
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8. Contaminated oil dirt-rust-water etc.
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I have my nephews 83 Maxim in my garage, when I start the bike oil flows from what I believe is the drive shaft vent tube into the air box. What would cause the pressure in the driveshaft to increase to...

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.
Have a close look at the oil level in the crankcase....Yamaha usually has an oil window ....down low on the side of the crankcase....with the bike warmed up and shut down a few minutes on the centerstand...the oil level should be about half way in the glass.....overfilling the crankcase will cause the oil carryover situation you describe.

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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?
The GS1150 is a real pain to get the precise oil level, and you may have just over filled it. As you are sitting on the bike, on the right hand side below the airbox (near the rear shouck adjuster), is a little plug. Just twist it to undo it and see if any oil comes out here.
My method to check the oil level on flat ground: After a run park the bike on its side stand for 10 mins. Place on the centre stand, wait anoth 5-10 mins, then check the oil level in the sight glass.

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Have you changed the oil lately? If there is to much oil in the motor the bike will push oil up into the airbox and foul the air filter out. This will cause the bike to run rich. check the oil level and then drain any excess out to the proper level. You will need to clean or replace the air filter in order to make the bike run well.

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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.

If it IS hooked up, it or the airbox is cracked and needs fixing/replacing. If the breather line has somehow become plugged (mud-daubers are amazing at finding holes to makes homes out of), the pressure buildup could have split your vent line.

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