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Oil coming in breather box out of carb - Motorcycles

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  • 342 Answers

Check you oil level and for gas in the oil.

Posted on Nov 03, 2012

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Posted on Jan 02, 2017

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onyeredson
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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?
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Posted on Mar 05, 2009

raffaiel
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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.

Posted on Apr 15, 2009

wd4ity
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SOURCE: 89 Harley FLTCU oil coming from the crankcase breather tube and

This is an age old problem for the Harley engine. In you 89 model, the crankcase breaths from behind the oil pump through a tube that runs to the backside of the air filter assembly. Most people that I know, simply remove the tube coming up to the air filter and block the hole in the air filter assembly backing plate. At the breather, they run a short hose to just behind the transmission and cut it off there. This is similar to the earlier Shovelhead engine and the way it breathes. In 1994, Harley went to the "head breather system" which was better but it still gets oil into the air filter assembly.

There is one thing I saw on the aftermarket assessories market once called a "CatchCan". The breather tube ran to it and it seperated the oil from the air and the held it in a small container to be emptied on a regular basis. I have never used one nor have I ever seen one so all I can tell you is what the book said. Matter of fact, I cannot remember where I saw it now. Custom Chorme catalog, maybe. Good Luck, Steve

Posted on Apr 30, 2010

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2005 hyunsung comet 250 blowing oil and gas out of breather while running.


It may be running ridiculously rich or the float in the carburetor is stuck open and pouring fuel into the cylinder while it sits. Drain the oil and if fuel is in it, you probably have a carb issue. Getting oil in the air filter box is not unheard of because a hose connects the crankcase to the breather box to let unburned fumes back into the cylinder. I'm not familiar with this bike but I've known some bikes had a tendency to cough up oil into the air intake if you ran it wide open on the throttle. The older big displacement kawasaki vulcan cruisers come to mind.

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Oil coming via the engine breather can mean a worn engine, it could be as simple as an over filled sump, or the breather valve itself is not working, the breather valve allows the crankcase pressure out of the engine.

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Remove the Oil Breather from the side of the engine near the base of the valves and clean it with both engine degreaser and carb cleaner. If the reed assy sticks on the breather the crank case will over pressurize and port oil into the breather. Also if the engine was over-serviced with oil it will present the symptom you describe. Sometimes a carb problem will allow fuel to leak into the crank case after sitting for a long time and the oil will have gas in the oil. Sniff check the oil. If it smells like gas you may also have a sticking carb float or float needle.

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This is probably not a blown gasket issue. A bad head gasket can allow oil to enter the cylinder head/combustion chamber if it's not sealing off the valve area. A simple suggestion is to check on the engine opposite the carb side for the oil/crankcase breather. It will have 2 screws holding it onto the block. It has a type of filter media in it that traps excessive oil and oil vapors from the engine. It is also connected by a tube to the air filter housing. When you tipped, you probably put too much oil in the breather and it was inducted over to the air filter/carb intake side.
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Your oil breather (on the side of the engine opposite the carb) may be malfunctioning/defective allowing the carb to **** oil from it. There is a breather tube that crosses over the top of the cylinder connecting the crankcase( oil) breather to the air filter housing. Check the oil level and the condition of the air filter and esp. the oil breather. It serves the same function as a PCV on a car engine.

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