Join Date: Mar 2010
Location: Mount Vernon, WA, USA
Re: Oil leak - I think it's the rear main seal
Won't hurt a thing to drain the oil. There is a huge set of threads on I-BMW.com on how to fix this. I have the special tools needed ready to lend, you pay the postage each way. In the tools is a new Viton Oring for your use no charge. The dealer will be glad to do this for about $1500. But the price goes up, your in there and will need to think about changing out all your transmission seals too. And any other wear parts. Between Clymer and the ibmw threads you can do it yourself but it is a big job. 20 hrs if you move along, 30 if your like me and look at everything....intake orings, throttle body seals, crankcase vent line, throttle cables. The bike really has to come apart to do this job. You will end up putting in new clutch friction disk as this is a lot of oil. You also need to check your clutch drive plate and driven plate. If any slipping has been going on they probably are warped. So you see this can really add up. But once that Viton oring is in there your set for life. Most everyone changes the rear main seal too, but this is seldom the leak.
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I change your tires $50, you buy them on the web.
K13S, S1000R (gone through a few GS's & RT's)