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K1 oil/water pump rebuild
- Thread starter E.L. Buff
- Start date
From an older post within the ones in the Similar Threads pane below, I figured I'd check Motobins. They show an oil/water pump repair kit...currently shows under 30 British pounds. So, there appears to be sources out there. 
https://www.motobins.co.uk/
https://www.motobins.co.uk/
AntonLargiader
Active member
I rebuild them, and usually have all of the parts in stock. There are a few special tools that greatly simplify the process, so it's not a great DIY project.
It seems like every 80's vintage K I owned would leak coolant, usually within a year of my buying it (used). I did a lot of oil/water pump rebuilds, back when BMW sold a kit. Did them with no special tools as I recall.
When I moved up to 90's vintage K11s, the first rebuild I did failed, as it continued to leak. At that point I switched to buying used pumps instead of rebuilding. Never went back.
When I moved up to 90's vintage K11s, the first rebuild I did failed, as it continued to leak. At that point I switched to buying used pumps instead of rebuilding. Never went back.
Get the upgraded parts compared to my orig. 85 K100RS pump.
My 85 K100RS had an old "style" shaft that I upgraded with the rebuild. The old shaft used a nut onto a stepped down shaft, well the step down cracked, loose at first, and oil and water mixed. The upgrade used a bolt into a tapped hole that will last a lot longer.
My 85 K100RS had an old "style" shaft that I upgraded with the rebuild. The old shaft used a nut onto a stepped down shaft, well the step down cracked, loose at first, and oil and water mixed. The upgrade used a bolt into a tapped hole that will last a lot longer.
After a lot of review this summer, I determined that this particular job is best left to a professional. I was able to take the water pump out of the bike, take it to the dealer, and have them put in new seals. The cost associated was on par with me buying a kit, doing a botched job, then having to install yet another kit 
(Plus it's under warranty for a while, in case they also messed up)
(Plus it's under warranty for a while, in case they also messed up)
