1990 Yamaha XT 600 E Logo

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Anonymous Posted on Sep 30, 2013
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My 1990 XT 600 is spurting oil out of the crank case ventilation breather tube into the air filter box.

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onyeredson

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?
Please press the Blue Button for appraisal of my FREE! Effort.
Thank You! & Good Luck.
Paul 'W' U.K.

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Anonymous

  • 53 Answers
  • Posted on Mar 26, 2009

SOURCE: oil blowing out of trans breather tube

hi 81 yamaha i am concerned about the fuel smell coming out with the oil. could be the carbs flooding filling your crankcase with fuel? if not it sounds like you have blow by which would cause your crank case to be slightly pressured. this is caused by worn piston rings. do not plug your crank vent. if you leave your vent open install small filter to stop dirt from entering jim

Anonymous

  • 209 Answers
  • Posted on Apr 15, 2009

SOURCE: oil breather problem

keep your oil breather unblocked all the time's coz the pressure of it can destroy your gasket and oil seal.

Anonymous

  • 2 Answers
  • Posted on Apr 26, 2009

SOURCE: Gas & oil in air filter box

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

Anonymous

  • 1167 Answers
  • Posted on Sep 15, 2009

SOURCE: how many liters of oil for xt 600

hi buddy by the oil plug will be a number for example 70c /700cm2 this will mean 700ml or you can do it by looking at the oil sight glass should come 3/4 full but make sure you add more as the oil filter will be empty so that needs filling also remember before you drain the oil run the bike for 5 mins so the oil becomes thinner and all drains also dab some oil on the new oil filter seal buddy any more info get back to me

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I have a 1991 yamaha fzr 600r. the filter box keeps filling up with oil,,,,,,, the tube that goes from the breather box to the top of the motor is where the oil is coming from. i took off the breather,...
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Oct 09, 2013 • Yamaha FZR 600 Motorcycles
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1990 XT 600 Yamaha motorcycle BLOWING OIL OUT OF THE BREATHER TUBE ON THE CRANK CASE.
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Oil in the air filter ,RANGER 500 2X4/4X4
Has the oil been changed lately? A lot of times over filling the oil will cause oil to blow back thru the carburetor, Also if the air filter got caked with mud running the box with no lid or allot of dirt in the filter. The engine will try to use the crankcase breather hose as an air intake since not enough air was coming in the conventional way, therefore sucking in oil. Has it smoked at all? Sometimes if you try to shut it off oil will run back down the intake tubes into the air box. This may be applicable to your engine that the breather is being used to **** oil into the box due to lack of fresh air intake.
The other possibilities would be crank case pressure pushing the oil in (piston ring blow by), but that should (theoretically) result in low compression (since the cylinder pressure is getting to the crankcase instead of staying in the cylinder), the oil is overfull and being pushed out since air will compress but liquid will not, or poor crank case ventilation system design (but if that were the case likely there would be a recall as that would directly effect emissions which is federally regulated).
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Oct 07, 2010 • Polaris ATV
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Oil comes out the crank case breather tube engine runs good no exaust smoke oil is on full mark whats my problem?
IS THIS A 4 STROKE ENGINE? DID THE BIKE FALL OVER ON ITS SIDE FOR A LONG TIME? A PLUGED UP FILTER IN THE AIR FILTER BOX,OR A POSITIVE CRANKCASE VALVE PLUGGED UP? THE CRANKCASE VENTING,VAPORS NEED TO GO INTO THE AIR INTAKE AND BURNED IN THE COMBUSTION CHAMBER CYLINDER.
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Sep 09, 2010 • 2005 kawasaki KLX 110
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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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May 11, 2010 • 1995 Honda XR 600 R
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Oil blowing out of trans breather tube
hi 81 yamaha i am concerned about the fuel smell coming out with the oil. could be the carbs flooding filling your crankcase with fuel? if not it sounds like you have blow by which would cause your crank case to be slightly pressured. this is caused by worn piston rings. do not plug your crank vent. if you leave your vent open install small filter to stop dirt from entering jim
Read full answer
Mar 21, 2009 • 1981 Yamaha XJ 650
1helpful
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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?
Please press the Blue Button for appraisal of my FREE! Effort.
Thank You! & Good Luck.
Paul 'W' U.K.

Read full answer
Mar 05, 2009 • 2002 kawasaki ZZR 250
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Oil shooting in to the air box
Hello,
From your brief description I'm guessing a high mileage machine? or Previous owners have revved too much from cold?
It sounds like the engine is possibly breathing? the pistons and compression rings are worn so exhaust gasses and compression leaks past them and pressurizes the crank case sending oil out the breather, so the air filter draws it in.
If the bike is performing o.k. and you can live with it try a dribble/breather can? pop the vent pipe into a seperate container to catch it. Make sure you seal the hole in the air filter so contaminents can't get in. also the new breather needs air circulation so trial and error on a recepticle.
Good Luck!
Paul 'W' U.K.
Read full answer
Jan 08, 2009 • 1996 Yamaha FZR 1000
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2006 Suzuki DRZ400S oil leak from bottom of air cleaner.
Often times there is a engine breather tube that has to do with emissions that runs from the engine to the air filter breather box. This tube can in some cases blow oil through it when the engine is run hard. Make sure you're not over filling the engine with oil when you change it because this will cause the oil to "blow off" the excess and the air box is where it often goes.
There is also another possibility, are you using too much oil in your air filter after you clean it? This too is a common cause for oil in the air box, if that's the case I would not worry about it.
The last case scenario is one you don't want, that would be washed out rings which cause blow by and that in turn causes the engine to blow oil out of the breather tube which I'm confident it venting into the air box.
Please let me know if these resolve your question and if not give me more details and I will be happy to assist you further.
Regards,
RSelvy
Read full answer
Dec 08, 2008 • 2006 Suzuki DR-Z 400 SM
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1990 XT 600 E

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I have a 1991 yamaha fzr 600r. the filter box keeps filling up with oil,,,,,,, the tube that goes from the breather box to the top of the motor is where the oil is coming from. i took off the breather,...

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