I've grown tired of having a fully functioning speedo but inactive odometer. I must have put on an additional 35000 kms over the past eighteen months with my daily travels, the trip to Victoria, up to Cape York, and last year's Long Ride Round OZ. So, I've got my speedometer apart on the bench in front of me right now and have stripped it down to the essentials.
Using a strong magnifying glass I was able to spot part numbers and teeth count on the back of each cog. I've verified the teeth count by marking them, and I've taken pictures of the disassembly through the various stages and will post them with descriptions when I reassemble the cluster.
This is the tooth count and gear colour for Km/h speedo heads:
(My 'bike is a 1986 K100RS, and this
might differ for yours.)
Part number 236 is white with 11/33 teeth (The pink colour has blended onto this cog from the other one)
Part number 237 is pink with 23 teeth
Part number 238 is brown/orange with 34/40 teeth (this is the one that's totally stuffed)
Part number 239 is red/orange with 16/44 teeth
The primary gear is brown with 12 teeth
(Warning, I am mildly colour blind, as most blokes are!)
The 34/40 tooth cog is stripped of half its teeth and the rest of the cogs are in good nick. Fragments of the teeth were spread throughout the cluster. The bits had jammed the odometer completely. Once cleaned out the cluster spun freely.
It turns out the recently discovered Redcliffe, Queensland seller (by the name of Parts Lunacy on eBay) DOES NOT have any Motometer gear sets for BMW motorbikes. I am now hot on the trail of the nearest seller who does supply them in Australia. Ray Peake BMW repair of Canungra has the set but he's two hours away by road, and a tad expensive. I might have to mail order them from him if my rock-turning-over session turns up nothing locally. I'll keep ya's posted. Cheers!
Update: I'm taking a spin down to Otto's in Salisbury (on the southside of Brissy) tomorrow. I rang him and although he was reluctant to sell the gears separately (says he only repairs the units) he agreed that if I was in that far he'd let me have 'em. Bonus.
Here's another US site in Virginia with some useful information:
http://www.odometergears.com/products/BMW/R+%26+K+Motorcycles/42Click the link then select the drop-down at the bottom of the page for replacement single gears. I hope this helps someone. Cheers!