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Is his a trick question?
A 1991 R1100R?
Why not just buy the belt from your BMW dealer? It is a specific 4-rib poly-v groove belt in a small size not common to a lot of engines. Plus its less than $25.
Thanks for the answer.
I'm looking for an after market replacement. Not the BMW part number.
Old thread;
http://forums.bmwmoa.org/showthread.php?t=8983
When I bought my spare at NAPA in 2009 it was $12.29.
Actually, a good thing to do is write the NAPA part number in the owners manual, or somewhere under the plastic (under the belt cover) in case it should ever fail on the road. At least NAPA stores are far more common than BMW cycle dealers.
Since they don't weigh much or take much room I just carry one with me on long trips. A broken alternator belt will just wreck your whole day...
Dayco, (company I used to work for) makes automotive belts, and Dayco makes a belt for the Oilheads.
Dayco Polycog 5040240, 4PK0610
I've had one in my bike for the past 45,000 miles. I have an extra I carry on the bike.