Final drive/swingarm leak

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jax BMW
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Location: jacksonville, florida

Final drive/swingarm leak

Post by jax BMW »

My 1997 R850R with 31K miles has had a leak that appears to be coming from the swingarm housing. I changed the final drive fluid last week and loosened the rubber boot between the swingarm and the final drive and noticed about a tablespoon of fluid at the rear of the swingarm. For about a couple of years there has been a buildup of residual fluid aroud the exterior of the swingarm, near the rubber boot. Does this sound like a leaking seal from the gearbox? By the way, I've changed both the final drive and gearbox and replaced it with Mobile One over the past 25K miles.

Should I be worried about this, or just keep an eye on the gearbox fluid level?

And, has this been a common problem associated with this motorcycle?

Thank you for any input.
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Biff's R
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Location: Newark, OH

Post by Biff's R »

It sounds like a final drive seal. I would just keep an eye on it, and go from there. Iff it starts leaking more, then you need to get the seal replaceed.

The transmission seal, will have more volume. Did you look up inside the paralever housing? You should be able to tell from which end it is leaking.
Jeff (lifer #289)
'17 F800GSA
'04 R1150R
There ain't no education in the second kick of a mule!
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