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Kawasaki GPZ250R I have a Kawasaki GPZ250R that keeps on filling the airbox up with oil via the crankcase breather. Is the supposed to be a vavle that stops this happening?

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  • sroldfield Feb 04, 2008

    Thanks for you excellent response - much appreciated! This has only happened since doing an oil change so I also suspect option1 - however, we drained the oil and only put in 1.6ltrs and it still does it - I wonder now tho' if draining oil by removing oil filter plate drains less that using the drain plug? Will investigate - cheers

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Hi,

A very light very thin film of oil inside the airbox is good/normal since this help absorb dust that is not filtered in the air. Too much though is an indication of something is not quite right inside the crankcase. This could either be:
1. too much oil in the engine;
2. carbs varnishing. This is related to fuel overflow right into the Venturi entering the cylinder and into the crankcase. The oil gets saturated;
3. engine overheating and cooks the oil.

Of the above, I tend to suspect the first. Kawas of this design are meant to have oil filled to the halfway mark of the glass window when the bike is on its center stand or completely upright.

Kawasaki GPZ250R - 0608eb7.jpg

Alternately, if you warrant a temporary remedy, a small PCV valve placed in line with the breather should prevent oil coming back out. These are oneway valves and will only allow air to come in but not out.

Another is to cut short the breather and install a small K & N filter while plugging the other half going to the airbox.

Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

P.S.

Doing wheelies could also be the cause.

Ride Safe.

Posted on Feb 04, 2008

  • Louie  Role
    Louie Role Feb 04, 2008

    Hi again,

    Appreciate your post back for update info. One of my bikes, a ZZR, has basically the same engine and manual says needs 1.9liters of engine oil. Everytime the oil is changed, what will drain out would be less than 1.9 liters. I suspect that a good amount would be left above the cylinder head or in the oil galleries. Normally, I change oil after a good run (to make the engine really hot) and leave it overnight draining.

    I have removed the airbox and replaced it with two (2) K & N airfilter slip-ons. The oil breather is likewise terminated using a small K & N filter.

    Hope this be of further help/info.

    Would appreciate if you can rate this response as you see it fit.

    Cheers.

×

Wrong site friend.

Posted on Feb 04, 2008


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