Clicking sound is the solenoid working, starter won't turn over the engine as the brushes are worn out or not connecting with inside of the starter through a build up of waste carbon dust.
The most likely cause is the fuel pump controller. It is positioned under the cover just left of your instrument cluster, on top of the fuel tank. These units are not repairable and it will need to be replaced. this is what it looks like.
smell your oil, does it smell burnt? if it does, then you probably have worn clutch plates. but there is also the possibility that your clutch springs are to weak or broken.
this is funny to me because i dont work on bmw bikes at all but i have been around tps sensors at an old bmw job to know they are so sensitive to temperature changes that increase and decrease the psi. if thats not the case you might need a new one.
There is a seat lock on the LHS side of the bike just below where the front and rear seats meet.
Turn the key clockwise and remove the rear seat. Now turn the key anti clockwise and remove the front seat. If it doesn't release, just put a bit of pressure on the rear of the seat (or bang it with your fist) while turning the key.
Your starter bendix possibly needs cleaning. Unfortunately these are sealed units and can only be dismantled and re-assembled with specialized equipment. They can be purchased loose.
Have a look here: Starting
This is the part you are looking for:
Looks like that the clutch needs adjustment or may need a replacement. This issues really occur when the clutch is worn out. I suggest that you have it replaced to resolve the problem.
Hope this helps and thank you for using Fixya! have a good one!
The battery hides just underneath the rear of the fuel tank. The video shows how to replace it by lifting the rear of the tank. This is the new battery specifications
depending on your scanner you may not retrieve abs codes check fuses the usual problem is a failed or damaged abs sensor borrow or have a shop run /scan for codes
On a 2008 BMW 650i, the fuse for the headlights is located in the fuse box under the hood. The specific fuse you need is Fuse #61, which is a 20-amp fuse located in the third row of fuses from the top.
To access the fuse box, open the hood and locate the black plastic cover on the right side of the engine bay. There should be a diagram on the underside of the cover showing the layout of the fuses. Once you've found the correct fuse, you can use a fuse puller or a pair of needle-nose pliers to remove it from the fuse box.
It's always a good idea to check the owner's manual for your specific vehicle to get the most accurate and up-to-date information on the location and function of the various fuses.