Question about Motorcycles
I have a shovelhead motorcycle and just started leaking oil from the air breather wich wets my rear tire. i changed the cam cover from a worn bearing but still leaks. also there was a plastic part which i was toldwas to slow oil preasure is that true. why is it still leaking from my air breather
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Posted on Jan 02, 2017
Just a possibility, i found this worked on some cars with similar problem (at least reduced the amount of oil going up the pipe)
Add a (bit at a time) bottle of STP oil treatment, the thick gooey stuff, it should increase the surface tension of the oil, keeping it in one piece, not splitting up and splattering around --> thus being less readily exhaled up the blow-off pipe.
just a thought. this will also increase the compression a little since it thickens the oil, will take up a little wear too coz it likes to cling on to bearings.
Posted on Apr 30, 2009
SOURCE: oil leak out of a breather hose
a small amount of oil from the crankcase vent hose under hard acceleration is most likely normal.American bikes don't leak oil,they mark their spot!
Posted on Sep 29, 2009
is it The cover behind the front tire with the 2 allen screws holding it on ?, this is the cover for the lifter adjustment. i believe its chrome. Remove the cover and you'll see the valve spring and rocker arm. This is where you make the valve adjustment. The cover has a rubber type gasket around it. You can purchase them from your Yamaha dealer. Replace the rubber gasket and your problem is over. Once you remove the cover you will see. Good Luck!
Posted on Jan 23, 2010
Testimonial: "Thank you for your answer it was very helpful"
You have a crankcase breather hose that may be blocked, allowing excessive oil pressure to push oil out. It should be routed to the airbox. This may also be the overflow hose you are speaking about. Your oil type may not be suited to a motorcycle engine, automotive oils are NOT suitable for bike engines for many reasons, notably shared gearbox and engine oil and a wet clutch. Check function of the oil pressure switch as this should send a signal of loss or excessive oil pressure. Check your manual for correct weight and quantity and type of oil filter needed. The oil level is indicated on the stem of the oil filler cap.
Posted on May 13, 2010
SOURCE: my 95 xr600r dirt bike leaks oil
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.
Posted on Jun 01, 2010
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