I have a 2002 650 Kawaski Prairie ATV. I have oil getting into the air filter that houses the carb. I think that the oil breather is plugged. Where is the oil breather locaated so I can change it? I didn't find the make or model for my ATV in the "choose a model" tab?? Thanks, TMLA

Paul W

• 404 Answers
• Posted on Mar 05, 2009

SOURCE: oil leaks from breather box

Hi!
From your brief description It sounds like you are experiencing Crank Case pressure build up.
I presume your ZZR is of High mileage or possibly previous owners havn't serviced it regularly.
The problem being the compression Piston Rings wear and allow Blow Back gasses into the crank case there by building up pressure, this in turn sends an oil film up the breather tube to your air box resulting in your problem.
You could try an oil & filter change (Synthetic) Top jolly with maybe an additive plus similar for the fuel i.e. Red-Ex or similar, it may help but I doubt a cure.
If you want you could extend the breather pipe away from the box into a drip can or similar, be sure to filter it as you don't want to get contamination down in the cases.
Hope this sorts it for you?
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Thank You! & Good Luck.
Paul 'W' U.K.

SOURCE: Gas & oil in air filter box

P.C.V (positive crankcase ventalation) valve is bad.

SOURCE: oil leaking through the air breather. oil is

Just a possibility, i found this worked on some cars with similar problem (at least reduced the amount of oil going up the pipe)

Add a (bit at a time) bottle of STP oil treatment, the thick gooey stuff, it should increase the surface tension of the oil, keeping it in one piece, not splitting up and splattering around --> thus being less readily exhaled up the blow-off pipe.
just a thought. this will also increase the compression a little since it thickens the oil, will take up a little wear too coz it likes to cling on to bearings.

SOURCE: there is oil coming into the air breather on a harley 883

This is common, there is a oil bypass that dumps oil into your air filter. Most of us run the oil a little low to avoid this. I run mine with the oil midway between the full and low lines.

SOURCE: won't idle steadily

Check the rubber boot that joins the carby to the engine to often have seen the hose clamps over tightened therefore creating a split in the rubber letting to much air in giving the rough idle eventually you wont be able to start it at all (have a good thorough look inside an outside of boot doesnt take much)