Question about Buell M2 Cyclone Motorcycles

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I'm getting a lot of oil blow back coming from the vent tube off the side case. What could be causing this.

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  • 473 Answers

Blow by is what causes it - Those motors weren't really designed to be turning RPM's all day. You will want to install a oil catch can inline to help pull the oil out of the breather assembly. There is no way to stop it unless you upgrade to the newer XB PCV breather setup.

Posted on Nov 05, 2013

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Posted on Jan 02, 2017

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jackiaria
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SOURCE: 2001YZ426F oil blowing out vent tube

Dear pmg1, Sat 02-21-2009 5:37pm EST (USA)

RE: 2002 Yamaha YZ 426 F
or
2001 YZ426F

"Hard to Start if any and/or Oil Blowing Out Vent Tube"

RE: ABOVE is what I'm reading @ the fixya Site @
http://www.fixya.com/PostAnswer.aspx?thid=1695323&prdid=986097&ctgid=391 so.......

Is your Yamaha a 2000 or 2001?
Did You try to start it several times, then it kicked in a little, then a little more, then
started spitting oil and won't even start?
Has it been sitting for quite some time?
Did you put new gas in it?
If so...................................................
Check the OIL and replace if needed..........................................
Put in a can of high test GAS...Spend at least $10.00!.................
Spray a lot of Starter Fluid ($3) into the Air Intake........................
Crank Engine!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !

When you get it running, IF IT'S STILL BLOWING OIL .............................
Add a can of CRANKCASE SEAL'S LEAKS (less than $10) for conditioning
the seals............................................and......................................................

NEVER USE YEAR OLD GAS AGAIN AND ADD FUEL CLEANER AT
EVERY OIL CHANGE!

jack
b806e68.jpg

Posted on Feb 21, 2009

  • 409 Answers

SOURCE: 85 honda xr 350.. blowing oil out of the vent tube

Might be time for a rebuild. You need to check the crankcase breather to make sure it is not stopped up, if it is good might be time for a re ring.

Posted on Mar 15, 2010

  • 365 Answers

SOURCE: i have a lot of oil blowing out the over flow tube

sounds like you may have broken rings and it pressurised the sump and blowing the oil up the tube

Posted on Jun 18, 2010

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2 Answers

There appears to be some kind of breather tube (?) going back into the top of the transaxle of my kubota g1800 tractor and is blowing hyd fluid out around where it attaches. what might be my problem?


if it is a breather tube and pressure is building up , it is possible that there is oil in the tube and combined with dust it has gone solid and is blocking the breathe
check for any low areas of the hose that might retain oil

Jun 30, 2016 | Kubota Garden

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How can I stop oil from coming from my dipstick?


Depends on the cause.
Blow-by is when oil blows by the rings in the cylinders into the combustion chambers or compression blows by the rings into the crankcase. It can also be caused when too much pressure builds up in the crankcase because of a venting problem.
So blow-by can cause smoke out the tailpipe from oil burning with gasoline, or oil collecting in the air cleaner, or blowing out a seal or other place like your dipstick tube.
If it is caused by worn piston rings, the rings have to be replaced.
If it is a venting problem, you need to open up the vent, like the PCV valve or the air intake port.
If you remove the cap where you add oil and there is a vacuum when the engine is running, the venting system is working. If oil blows out the hole, there is too much pressure in the crankcase.

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1 Answer

Oil coming out of crankcase vent tube


I'd quicker think piston ring blow by the piston thus compression leaking / blowing into the engines base.

Mar 01, 2014 | Motorcycles

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While my 88 isuzu is running or when you shut it off, oil pours out the vent tube coming off the fuel pump... why is this happing and what can i do to fix it?


Sounds to me that you are getting oil in you fuel, I would take and get pressure tested to see if any crack's in head or block. Good luck.

Apr 01, 2011 | 1988 Isuzu Pickup 2WD

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1988fxstc. Oil is blowing out of what looks like a oil tank vent hose that ends down by the rear tire. This is not the drain hose, but looks like a venting hose that is open near the rear tire. Anyone...


Without seeing the bike, I would guess that this is the crankcase vent. Originally, the crankcase vent tube came up from behind the oil pump and went to the backside of the air filter. A lot of owners changed the routing of this hose due to oil being blown into the air filter. They simply remove the metal part of the tube and replaced it with a short open ended hose running back and ending just forward of the rear tire.

As for the oil blowing out of the tube, it depends on how much oil blows out of the tube. If it's just a mist that will sometimes coalese into a droplet, this is about normal. But, if it's a steady drip or flowing oil, this is not right.

If the mist is heavy, this could be caused by excessive blowby on the rings creating high crankcase pressures. The use of synthetic oil should not increase the blowby unless the rings are in poor shape, then it will. The use of synthetic oil seems to aggrevate any minor leak turning it into a much larger leak.

If the oil is coming out in a steady stream or pumping the oil out of the engine, you proabably have sheared a key in the scavenge gears of the oil pump and it's not pumping the oil back into the oil tank.

Now there is a vent hose on the oil tank but it should be routed to a fitting on the crankcase that is located just above and slightly behind the top of the oil pump.

Good Luck
Steve

Oct 17, 2010 | Harley Davidson FXST Softail Standard...

2 Answers

I got a 92 Ford F250 and I was recently changing filters on it (its got the 5.0) and I noticed that the crankcase breather located in the air box always falls apart (i have had several of these types of...


Your PCV valve is usually about a $2 part and is suppose to keep oil out of this tube. Follow the tube back to the valve cover and the PCV valve should be there.

Excessive blow by could also cause oil to get into this tube. The blow by is usually caused by worn piston rings or valve guides. The compressed air/fuel mixture or exhaust pushes past these areas and make it into the crank case. Usually if you have a lot of blow by, you'll see your dipstick tube popped out a bit too.

PCV valve is cheap and easy to change... I'd give it a try.

Mar 30, 2010 | 1992 Ford F250

1 Answer

1989 r100gs veeps oil out of left side vent on


you may have a lot of piston blow by and its to much presher for the vent to cope with

Mar 23, 2010 | 1989 BMW R 80

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Whaen car idles its fine but when driving it sputters an when it builds boost it blows the intake pipe off the throttle body an oil comes out of the throttle body


in your car the air ventilation system is freeze up causing a build up of pressure which caused the oil to burst out. there is the mosture sludge build up under the oil fill cap . its advisable to clean everything up and then check out by starting the car. also spray crab cleaner in the throttle body and check out. as per me the problem is causing because of :-- I guess the breather vent tube was full of oil - frozen in there somehow. Must have to do with that sludge buildup on my oil fill cap. This is the one coming off the front on the left side of the oil filter. It goes down under the engine. This blockage caused a pressure buildup in the crankcase which caused oil to blow by the pistons and into the combustion chamber and out into the air intake hose and throttle body. get the spark plugs removed and cleaned up all the oil. The reason it sputter is because of all the oil in the combustion chamber. No air could get in. get the oil change and insulate the breather pipe in case of future freeze ups. This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya

Feb 27, 2010 | Saab 9 3 Cars & Trucks

1 Answer

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

Mar 21, 2009 | 1981 Yamaha XJ 650

1 Answer

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

Dec 08, 2008 | 2006 Suzuki DR-Z 400 SM

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