Question about Honda CRF 450 R Motorcycles

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Oil is comong out of crank case breather,oil level in motor is correct

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Make sure u hav correct grade lubricant-the oil maybe to thick or double check level to make sure its not too high

Posted on Aug 30, 2010


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Posted on Jan 02, 2017


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Why 1992harley pumps oil when cranking over to star

Check your oil tank level. If it is empty or very low, the oil has seeped by the oil pump check valve and has filled the engine cases with oil. I assume the oil is coming out the air cleaner breather tube? If so, add a quart or so to the oil tank, run the breather hose into a can or bottle, and start it up. Oil will flow out the breather until the cases have been purged. When it stops pumping out refill the oil tank to the proper level. This can happen when the bike has been sitting for a few months or more.

Mar 12, 2015 | 1993 Harley Davidson FLSTF Fat boy

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I have a 1995 susuki rf 900 oil is coming out my motor into the breather box

how much oil , have you checked oil level correct , if you run the engine is there a lot of air pressure blowing out of the breather pipe and if so then you got crank case pressure build up and got a problem with rings or valve stems or seals etc ! check compressions too ! P..

Dec 25, 2013 | Motorcycles

1 Answer

Oil level rise on dipstick

Black smoke is either a rich running carburetor or oil is being burned. Most carburetors are adjustable. Try adjusting any screws for best run. Oil burning and level could be a plugged crank case breather (cleanable), bad rings or valve. Good luck with this one.

Dec 14, 2013 | Garden

1 Answer

Positive cranke case breather pipe leaking oil smoke when running

Check oil level and or change oil if necessary.

Oct 06, 2012 | Ural Motorcycles

1 Answer

What makes a 2005 Yamaha YZ 450 F Blow Oil Out The Crank Case Hose Into The Breather And White Smoke Out The Pipe Thanks

Hi, Shawn_luke_I 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.
5. Faulty breather valve or system.
6. Pinched or clogged breather line/hose.
7. Clogged or failed oil filter.
8. Contaminated oil dirt-rust-water etc.
9. Excessive oil foaming.
10. Wrong oil type not designed for your bike.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a wonderful day.
Oil coming from breather vent
Oil out of breather tube on YZ250F
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual

Aug 17, 2011 | 2005 Yamaha yZ 450 F

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I have a Honda XR250 dirt bike, When the bike is running oil is pumping out of the crank case breather. can you tell me how to stop it?

Sounds like one of two possible problems.
1.) You have overfilled the oil level.
2.) You have a faulty oil pump.

The 98 xr250 is a dry sump model and the oil pump, pumps oil back to the frame/tank (oil in frame).If you have too much oil in your system the oil tank overflows back into the engine the excess oil can affect the internal pressure in the engine this can cause some of the excess to be vented through the crank case breather. A more severe and urgent problem could be a failure of the oil pump to return oil to the tank , this could lead to severe engine damage as your oil system could be starved. Firstly drain all your oil and measure what comes out , should be no more than 1.4 litres, if you have more you have found the problem !! If the amount of oil is correct, then i am afraid you will have to open the engine and have the oil pump / lubrication system examined / replaced by a professional.
Hope this helps

Oct 08, 2010 | 1998 Honda XR 250 R

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Missing plug

On top of the motor. Are you sure it's on top of the motor or could you mean pump? There are two parts to a compressor electric or gas motor and the pump. Although the two are combine in small compressors they are still separate components.

You said it may be related to the oil plug correct?
Most compressors between 1/2 hp to 2hp come in two flavors. The first is oil less the second has an oil reservoir. For the latter the oil plug does double duty as the crankcase breather and the oil fill opening. If the opening where your missing nub was located leads down into the crank case it's most likely the oil cap. If that's the case then you need to replace it with a comparable oil breather cap. It can also be a real mess if you start a compressor without the breather in place.

So is your compressor oil less or oil lubricated type?

If yours is the former, oil less then you will need to include some information (make, model), about the compressor for any additional help.
So please respond back with that. Thanks.

Nov 11, 2009 | Air Tools & Compressors

1 Answer

2006 KX250F blowing oil out breather should I be concerned?

ther is a chance that being over filled will blow out of the crank breather so drain off to the correct level if then the bike still does this then you have to high crank presure meaning the bore and piston/rings are badly worn
thanks jay

Jun 23, 2009 | 2006 kawasaki KX 250 F

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