The Airheads Beemer Club is a non-profit club reclaiming the 'Legendary Motorcycles of Germany'

Topic-icon 1979 R100 Final Drive Oil Loss

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3 months 2 weeks ago #4634 by Wobbly
1979 R100 Final Drive Oil Loss was created by Wobbly
1979 R100 RT
I left my house when it was 38°F and rode up the expressway to a ride meeting point. It's 7 miles to the freeway at 45-50mph, and then another 10 mile jaunt on the 65mph limited access road. Bike is kept in an unheated but closed garage.

When I arrived at the ride meeting place, there was evidence that final drive oil had blown itself out the breather, covering most of the final drive housing. It's quite evident that it came out the breather at the very top of the housing and not one of the seals. I've put over 35,000 miles on this bike (albeit at much more comfortable temperatures) with the same weight final drive oil and never seen this behavior.

Was it the cold temps, or does this indicate something else ?

Don't hide 'em, Ride 'em !!
#15150

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3 months 1 week ago - 3 months 1 week ago #4648 by 8053
Replied by 8053 on topic 1979 R100 Final Drive Oil Loss
It was probably the cold temps that caused this. Be sure to monitor the oil level closely. It happened to one of our IL. members last year on his first ride of spring time. He was concerned and kept a close eye on it, but it never happened again.

James Strickland, IL. Airmarshal
Last edit: 3 months 1 week ago by 8053.

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3 months 1 week ago #4651 by Wobbly
Replied by Wobbly on topic 1979 R100 Final Drive Oil Loss
Many thanks, Jim.

I have not had time to clean the bike, but the oil has been replenished and the loss was about 40cc. Not great, but on the other hand not enough to damage the final drive either.

Don't hide 'em, Ride 'em !!
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