Question about 2007 Yamaha YZF-R1

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Oil inside airbox why - 2007 Yamaha YZF-R1

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HOW HARD DO YOU REV THE THING CHECK OIL LEVELS

Posted on Jul 26, 2009

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You may have too much oil in the engine or maybe you do wheelies for too great of a distance

Posted on May 17, 2009

  • rayetcaro May 17, 2009

    you may have too much oil in the engine or maybe you do wheelies for too great of a distance

  • rayetcaro May 17, 2009

    you may have too much oil in the engine or maybe you do wheelies for too great of a distance

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Oil in air box


Yep, its somewhat normal. Your crankcase ventilation tube connects to the back of the airbox. There is a small foam to dampen the airflow and remove the droplets from the flow - but other than that the crankcase is connected to the airbox. Now the good question is that what amount is normal, i.e. under what conditions there may be excessive amounts of oil generating so much positive pressure to crankcase that the oil becomes clearly visible in airbox... one reason may be too high oil level to start with ? Other reasons may relate to some kind of piston blowby - like rings glued into the piston? Also it is sometimes possible that PAIR lets air to move back to the airbox - but have not seen that happening in a busa, just in a car. In that case rather than oil its black carbon residue which feels a bit oil'ish. You can test the crancase pressure by removing the hose from the back of the airbox and feel the pressure when engine is running. It should not be blowing air out - but some pressure, or more like pulses will be felt. (Its so long time when I have last done this test, so maybe someone could describe this better...) Anyway this reminded me about the fact that in cars there is often a PCV valve, positive crankcase ventilation valve. I am just wondering why we dont have that in busa ? The performance related desire to have negative crankcase pressure surely is not the reason...

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1 Answer

Oil in air box


Yep, its somewhat normal. Your crankcase ventilation tube connects to the back of the airbox. There is a small foam to dampen the airflow and remove the droplets from the flow - but other than that the crankcase is connected to the airbox. Now the good question is that what amount is normal, i.e. under what conditions there may be excessive amounts of oil generating so much positive pressure to crankcase that the oil becomes clearly visible in airbox... one reason may be too high oil level to start with ? Other reasons may relate to some kind of piston blowby - like rings glued into the piston? Also it is sometimes possible that PAIR lets air to move back to the airbox - but have not seen that happening in a busa, just in a car. In that case rather than oil its black carbon residue which feels a bit oil'ish. You can test the crancase pressure by removing the hose from the back of the airbox and feel the pressure when engine is running. It should not be blowing air out - but some pressure, or more like pulses will be felt. (Its so long time when I have last done this test, so maybe someone could describe this better...) Anyway this reminded me about the fact that in cars there is often a PCV valve, positive crankcase ventilation valve. I am just wondering why we dont have that in busa ? The performance related desire to have negative crankcase pressure surely is not the reason...

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2 Answers

Kawasaki GPZ250R


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.

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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.

Feb 04, 2008 | Computers & Internet

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