oil leaking out air filter housing

[toyotajoe]

I just purchased a new 2008 bmg Milan 150cc. Changed out the orignal oil first and replaced with 15w40 castrol gtx oil, took off for a 20 mile hard run shut off engine and had oil pouring out of the air filter
housing. Soooo I changed the oil again making sure not to overfill just sitting dipstick on top. The next day drove a mile or so no problem till about 6 more miles it stalled out at a stop oil coming out air filter housing again & will not restart. Anybody have an answer for me, the place I bought it from (countrymotorsports) say's they never heard of it.

[toyotajoe]

I,m sorry it's BMS not a bmg

[hotrodscoot]

on my scoot there is a blow by that is connected to the air box that might be what it is. are you running at high speed? check to make sure your blow by hose is attached.

[toyotajoe]

Was running at high speed to start with, blow by tube attached and was half full of what looked like water after first ride, so I drained it changed the oil again and same massive oil leak and is a no start now.

[Doug in San Diego]

It sounds to be like you blew the rings. Causing blow-by

Basically all the pressure that should be contained in the combustion chamber is blowing by the rings on the cylinder, then up to the valve area, then out your breather tube, to the airbox..dragging a bunch of oil along for the ride.

If this happened, and took all of the oil, you could have seized the engine.

It just seems odd that it happened on a brand new bike.

Wait and see what other Dawgs say. I could be totally wrong (would not be the first time)

Try this... try to turn the motor with a socket using the nut on the side of the white fan.
If it turns super easily (Problem)

If it feels like there is good compression at the top of the stroke (better)

Also - more info needed when you say no start...what exactly happens?

["Big Guy"]

Are you sure you didn't put too much oil in it? 750ml or half way up the dipstick is about normal (less than a quart).


-Rich

[toyotajoe]

Yea I'm sure there was not too much oil added (not my first scoot) I am pretty sure the oil rings went bad the engine turns over fine, think the spark plug is fouled with oil. Anyway I ordered a 158cc big bore kit, large valve preformance head, preformance camshaft, high output racing coil, NGK iridium plug, UNI filter, new jet for the carb and a MRP preformance exhaust from Enviromoto (Jeremy seem's like a great guy) I'm installing the part's 05.13.10 and will let you all know how it turn's out. Thank's for all your help and beware of countrymotorsports.

[toyotajoe]

And by the way Doug, you really sound like you know your stuff. Thank's again.

[Doug in San Diego]

Thanks, but not really

2 years ago I couldn't change my oil. Now I've done it all (except electrical thank God)

Oddly, the only reason I've done it all is because I messed something up first (like 2 sets of rings)

Anyway good luck.

I might suggest doing one thing at a time (I guess the top of the engine) then if anything is wrong you won't have to play the guessing game between 6 things (I did that too!)

Doug

[qwertydude]

Man what luck. I myself believe in a hard break in but what could you be doing to go through two sets of rings?

[toyotajoe]

Piston ring end gap is very important, so is clocking the ring's properly.

[toyotajoe]

Ok I think I found the problem, it's the valve cover. Almost sure the person that screwed the baffle onto the cover just said frick it when they broke off the screw head on 1 of the 4 screws during assembly of the part. The baffle plate is not down tight to its gasket under it, sticks up at what would be installed looking at front of engine, the top right corner has a circle on it fits right over the right top head nut & washer. Also almost sure the pressure from the engine is sending the oil through the vent tube on the cover instead of deflecting the oil back down into the case. Soon see, waiting on a new cover.

[Doug in San Diego]

Am I wrong?

I thought that the valve cover/valve area was not pressurized? I thought that if there was pressure up there it was a bad thing.

BTW - I believe I blew out my 2 sets of rings by keeping it a WOT down a really long hill every day, then keeping it at WOT up a really long hill every day.

Someone told me that htis creates a vacuum (the downhill) and oild gets sucked into the combustion chamber, then bam blown rings. I also used to drive my scooter like I stole it (hard hard hard all the time)

[qwertydude]

It was definitely the down hills. Cause I ride mine on the freway everyday wot on flats and uphills but back off on downhills.

[rockstar21]

I am having the same problem as you on my scooter. I checked my air filter a week ago and it was clean and checked it after my scooter starting losing speed and hesitating. My air filter was drenched in motor oil and the air intake tube is covered in oil. I changed the oil on the bike today and pulled the air filter out and it runs and drives perfect. Is it safe to ride it for now with no filter with the lid on?

[qwertydude]

You can ride around for a little bit but too much riding with no filter on will prematurely wear your engine. If you really need to ride I'd suggest washing down your air filter with carb cleaner, this'll get the majority of the oil out of the paper and let it flow again. You can do what some people do with the vent hose and put a long length of tube on the vent. Then with the long piece of tube you want to make it snake a path around to a higher elevation and back down, basically a long upside down U, into a small bottle attached to the frame. The large upside down U will allow as much misted oil to drain back into the engine and the bottle will catch the rest. Make sure to plug all the holes in the blow by system or remove it altogether and just plug the intake hole.

[rockstar21]

Thanks qwertydude, I am going to see if I can clean the filter until I can get a new one. I think I am going to work on that blow by system.