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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Cadyfatcat on April 19, 2012, 07:18:02 PM

Title: Got my bike working - concerned about bubbles in oil
Post by: Cadyfatcat on April 19, 2012, 07:18:02 PM

So I got a K75 in pieces from the PO. After the last few days I was able to piece it back together and get it running. Seems like it runs great. After checking the oil window after a short (10 mile) run, I noticed there were some brown bubbles on the top. They seem to dissipate within 15 minutes or so. Should this be something I am concerned about? Or is this how oil always looks after a ride, I just never looked at it through a window...

http://imgur.com/6AbX5 (http://imgur.com/6AbX5)

Title: Re: Got my bike working - concerned about bubbles in oil
Post by: frankenduck on April 19, 2012, 07:23:29 PM

The water and oil pump are driven by the same shaft.  There is a seal on it that keeps the coolant and oil separate.  Yours is failing and letting water into the oil - hence the bubbles.

You'll need to replace that seal.

http://www.motobrick.com/index.php/topic,1925.0.html (http://www.motobrick.com/index.php/topic,1925.0.html)