Originally Posted by Michael.lucinda
I am the owner of a bmw K1200rs. Living in Denmark.
Recently while idling the bike stop suddenly.
I opened up the left cover to see they the intake cam was NOT rotating. After removal I see that the little split pin holding the sprocket to the cam shaft was sheared broken. I removed the cam and am waiting for a new cam sprocket to arrive.
I have joined this forum because I hope one of you guys can help with some issues ..
1. Any chance that the valves have gone untouched. I have measured their height and they all seem to be in the same closed position.
2. How do I set the cams in the correct position once I have mounted the new sprocket?
If the valves are bent then I will buy another second hand engine. Any issues with the ECU from mine pairing with a new engine?
Any thing I should be aware of with an engine change?
Thanks a lot.
Welcome Michael !
Good intro in proper forum, BUT for future post / question you should use the appropriate k1200RS forum where you will get more answers - not many K1200RS owner will visit this "new memeber - intro" section.
K1200RS/GT "brick-engine" forum here: https://www.k-bikes.com/forums/42-k1200rs-gt-classic/
ABOUT YOUR current PROBLEM:
On these K1200RS/LT/GT "brick-engine" , in last 18 years, the only time we have seen such problem was a bad installation of the bolt at end of either camshaft(s) holding the sprocket(s). Either the torque was not proper (lower than spec), or someone has installed the sprocket just a bit offset from the slot machined in camshafts. Doubt very much this would be at factory - most probable is after a valve job OR a timing-cover removal job.
By experience on many other engines, I would say there is 99% chance one OR several valves are bent. Following proper installation of camshafts / Sprockets, you should do a compression test (or a leak-down test) to confirm any defective valves. Both the BMW service manual AND the CLYMER service manual (English only) will give you the method to align camshafts marks with piston Top-Dead-Center (TDC) to properly re-install camchain and sprockets (relative to TDC). The CLYMER manual is much better with more details and more pictures - about $US$ 43 on this side of the Atlantic.
A good used K1200RS engine is not so easy to find these days - many parts breaker (often insurance claims parted bike) will sell these on EBAY however not all these engines are as good as they may appear from the ad - you have to be carefull to buy from a seller having good reputation. There are some good deal if you are patient and do your homework and research. Brand new parts from BMW are much too expensive for such a project (cylinder head and maybe damaged pistons)
All K1200RS engine are basically the same for all years EXCEPT the early models (mainly 1997 and some early 1998) had connecting-rods issue that can cause major engine damage. You can also buy a K1200GT engine of 2003-2005 as they are the same as the late K1200RS. WARNING: DO NOT BUY a K1200LT engine !!
Any Motronic ECU from any K1200RS will work on any of these engine, although the last generation Motronic-ECU are a bit more fuel efficient (part number ending with "296"). It is possible your concerns are based on info you are read from later BMW models using CAN-BUS system like the K1200S, K1300S, K1300GT - these are very different systems with different more complex ECU - this does NOT apply to the earlier k1200RS/GT/LT - on our K1200RS the ECU are not coded with serial number or internal mileage / usage data.