Oil breather dripping oil- need breather tank?

Hey all,
I kept finding small oil puddles under my bike and have finally narrowed it down- the crankcase oil breather filter is getting saturated and dripping on the ground after I park.

I looked up some 1 qt breather tanks on summit racing, and found a plastic one for $32... Summit racing is 10 mins from my house, so I might go pick one up.

My question is- should this be necessary? I have the 810 wiseco kit and k+n pods. The bike runs perfect. Not sure if I should be blowing that much oil?

Thanks,
Mike

The first thing I'd do is check the oil level to make sure it isn't over filled --- bike level & on the center stand.

Yep, did you fill oil on side stand.....would cause an oil over fill.


+1

overfilled with oil or piston/cylinder clearance scoring blow bye....... :ohmy: if not overfilled with oil do a leak down test :blink:

Check what they said first,then do this.
Take that k&n filter off of the crankcase vent.
Run a piece of clear vinyl tubing from the vent up bottem of seat,zip tie it to frame to keep from kinking then loop it back down towards the rear tire.

All that oil is a symptom of a problem. Don't try and fix the symptom find the actual problem and fix that, overfilling the oil, blowby from bad rings, ect.

All motors will create oil vapours, particualy high power small jap bike motors. Bore it out and the problem is worse.

Usually on a standard bike the vapours vent back to the airbox. When you lose the airbox a catch tank is better like on race bikes.

On my former yoshimura gpz I vented the rocker cover and the clutch cover to a catch tank. Some oil residue is normal, too much is a problem.

If the bike is smoking heavily then that is a sure sign that you have excessive cranckcase compression.

Never really believed in filters here , a tube to a vented catch tank is better imo.

In the uk it was 'normal' to have pods and a breather pipe vented to a beer can on tuned bikes. Some race bikes even used the hollow swinging arm as a catch tank.

If you remove the oil cap and rev it-does it puff exhaust smoke???










i

My BSA race engine vented the crankcase through a short hose that terminated just above the counter-sprocket. It kept the drive chain lubed. Efficient - yes. Messy - YES!!! :laugh: :laugh: :laugh: Ed

I'm with Baldy on this, that much oil is a symptom of some other problem,My guess is that it is probably not minor in nature.

PLUMMEN- I wouldn't want that hose that might put out oil anywhere near my back tire

No need for a filter on that vent line....someone??? posted an informative article on this site detailing such
Mine has been unhooked from the airbox for36 years and still doesn't put out oil that drips anywhere. :ohmy:

Not literally on the rear tire,just in that general direction under the seat! :laugh: If you run the hose like I said you will have nothing but vapor coming out the end of the hose,the oil will drain back down before it ever reaches the top.
Ive done it the same way for close to 30 years on more bikes than I care to try and count.

The oil breather may be vented by a hose routed to exit underneath the bike.

Normal engine performance should not produce a discharge of liquid oil from the hose.

An aftermarket filter added to the breather or at end of hose is imo a worthless troublemaker, except of course in the unlikely event where needed to prevent alien oil-ravenous lifeforms from entering the breather.

A catch-can is used in racing situations to help avoid any expelled oil from being deposited onto the track surface.

Good Fortune!

cool, thank you everyone!

The oil is not overfilled.

I went investigating and it seems that although the oil SEEMED to have been dripping from the spot above where the breather is, after some riding and another puddle the whole breather assembly was dry.

I looked closer and it seems that it is coming from the valve cover, seeping down towards the inner cylinder, then coming out a relief hole near the tach drive. The tach drive was my first suspect, due to the oil around it, but after replacing the o-ring to no avail, I think I have finally tracked it down.

I gave the valve cover bolts a slight tightening around the area and we'll see what happens. If it doesn't fix it then it's time for a new gasket.

Thanks again for everyone's input! It did help me to eliminate the breather as a suspect.