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I went for a ride today and I noticed when I arrived after an hour of riding at about 80mph average I had a bunch of oil on the side of my bike coming from my breather.
So I decided I was gonna change the location of it to down the swing arm at the tail of the bike so it doesn't leak on the tire or anything anymore.
But while pulling it apart I noticed one side has a pool of oil and the other is just barely even wet. Now you can notice the puddle side has the threads in it a little and the other is mostly flush but it's still looking bad. Like why the hell is there so much oil on there? Is that what would normally be flowing into my intake and through the carburator? It seems quite excessive and I since I've seen the breather mod on other bikes without the oil trail that I have, so I am lead to believe something is wrong on my bike. I've pulled the plug off the air cleaner and I don't recall ever seeing a giant puddle of oil in the past.
I'm case you don't know the breather mod I'm talking about the last pic is there for an explanation.
The excess oil is coming from the umbrella valve. Time to replace both of them. Oil is heavier than air and gravity helps the oil flow down, not up. Your external breather fitting exit under the the throttle body and the oil heavier than air gravity kicks in. Remove the fitting and plug the holes. Place the fitting going upward to vent air out with the hose exiting between the swingarm and rear fender. Say Bye Bye to oil mess.
The excess oil is coming from the umbrella valve. Time to replace both of them. Oil is heavier than air and gravity helps the oil flow down, not up. Your external breather fitting exit under the the throttle body and the oil heavier than air gravity kicks in. Remove the fitting and plug the holes. Place the fitting going upward to vent air out with the hose exiting between the swingarm and rear fender. Say Bye Bye to oil mess.
The umbrella valves are prob pretty old as I can't remember ever changing them.
But I disagree with the reposition of the fittings as I've seen quite a lot of bikes with the same thing and no oil mess.
Originally Posted by chopper_man
Start simple, did you recently change or add oil to your bike? Could simply be over-filled.
My last oil change I filed the bike as normal not over. I just checked my oil now, the bike is cold and the oil level is about 1/4 between add and full
A lot of the oil carryover, at least on my bikes, comes from high RPM running. If I’m tooling around for hours I get home with nothing. However now that I’m in Florida, the highways are racetracks and I’m constantly doing 80-85 just to keep up with traffic. When I do higher RPM’s I get a little drips. I too keep my cold oil just below half on the stick and think it’s just the nature of the beast. Get a catch can if it’s bothering you.
That looks like maybe a quarter teaspoon of oil. If you did that every day for a month you’d still only lose less then an ounce of oil. It looks far worse then it is.
A lot of the oil carryover, at least on my bikes, comes from high RPM running. If Im tooling around for hours I get home with nothing. However now that Im in Florida, the highways are racetracks and Im constantly doing 80-85 just to keep up with traffic. When I do higher RPMs I get a little drips. I too keep my cold oil just below half on the stick and think its just the nature of the beast. Get a catch can if its bothering you.
That looks like maybe a quarter teaspoon of oil. If you did that every day for a month youd still only lose less then an ounce of oil. It looks far worse then it is.
Maybe, I rerouted my hose to a T and ran that line down by where the clutch cable goes into the tranny. I'm going for a longer ride today and I'll keep an eye on the spatter and oil level. But at least it won't spatter on my engine, and my exhaust pipe is brown with all the burnt on oil spray and that crap takes forever to clean off.
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Breather has too much oil
