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Ralph S
12-21-2010, 11:47 PM
Does anyone have a problem with leaking breather bolts? Rear cylinder breather bolt on my 00 M2 is leaking oil, not a lot,but enough to see traces of oil on the side of the bike.

aaronbuell
12-22-2010, 07:22 AM
My 98 S3 does the same thing. I plan on switching to an aftermarket set up.

Ralph S
12-22-2010, 10:36 AM
Aaronbuell, did the level of oil in your tank affect this at all, or did it leak regardless?

aaronbuell
12-23-2010, 01:51 AM
Oil level didn't seem to matter. I think on the stock set-up there was a little o-ring gasket behind the locknut, my back bolt was loose and I saw pieces of the gasket fall off when I tighened it.

Ralph S
12-23-2010, 09:06 AM
The ones on my bike are the 90 degree banjo type, not sure how tight they are suppose to be. I was wondering if i have to much oil in the bike. I guess these bikes like when the oil is on the low side and right now mine is half way between the marks on the dipstick.

aaronbuell
12-23-2010, 10:52 AM
They do like to run on the low side I keep mine at about the halfway mark. I filled mine to the top once and started it in my garage and blew the fill plug out and had an oil all the way to the celling.

I'm still running the stock 90 degree breather bolts (pic below)It's hard to see but you can see the fins on the rear head have a light oil build up.

http://www.buellxb.com/buell_images/3033_20090824112801_L.jpg

Ralph S
12-23-2010, 10:46 PM
Mine are definitelly aftermarket ones. I will drain a little oil out and see if that helps, if not i guess i will replace them. Thanks for your help.

Eviltwins
01-02-2011, 03:44 PM
http://www.buellxb.com/buell_images/8674_20110102093526_L.jpg

They do leak a bit, there is an umbrella valve in the head that works like a reed valve only allowing air/oil to travel in 1 direction if the leak is bad that could be the source. With a good umbrella and running on the low end of oil in the tank you can vent directly to air and get no oil push.