'97 with big end bearing trouble.
I am dipping my feet into the sea of road bikes again here. Managed to find a very very clean k1200rs that cosmetically was good and only had a seized engine. The description said it would not turn over.
The price was worth just getting it and parting it out if the damage was too much. So took it home and started tearing away at the usual suspects. Gearbox is good, bevel drive is good, clutch is good.
What I did find was that the drained sump oil looked like copper grease so off came the head and the crank cover. The cam shafts, the valves and the piston bores are all ok. The main bearings were also good.
However the bearing on the first conrod big end was fubar. It was all flaked out and had also galled itself to the crank. This obviously needs grinding to the stage 1 that BMW spec.
Question here is if anybody else has ever had to grind a k1200 series crank? Any experiences?
I have given the crank to a engine reconditioner who will grind the crank to the stage 1 as speced in the maintenance manual. It also calls for heat treatment of the journals once ground. does anybody have any ideas on this one?
Once the grinding is done I plan to purchase the 3 different colour stage 1 shells and find the best fitting using plastigauges. Again comments welcome.
The whole process will be marginally cheaper than getting a second hand crank btw
Pics of the failure to follow