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On a 1997 and 1998 BMW K1200RS gearbox oil should be inspected each 20,000km. Changing the oil is very easy, and shouldn't take more than a few minutes as it down't look like the side panels need to be removed.
As for the lever sticking at 3rd gear, try lubricating the selector. If it is a more serious problem then you may need to rebuild your gearbox. However I would put up with the problem for as long as you can.
If it will go into all other gears but not second, the transmission may have damage like a bent shift fork, damaged gears and/or shift drum. If the bike has been raced or accelerated hard and gear shifts have been missed, it most likely has transmission damage and the engine will have to come out and be torn down in order to repair. If the bike was hopping in and out of second gear before it stopped going into second, the transmission is most likely damaged. One more thing to try is to take the shift lever and push momentarily down or up on the lever and see if it smoothly returns to its original center position. If it does return to the center position the lever is not sticking and ir it does not return to center position then the shift lever is sticking and that will keep the trans from up or down shifting.
Check the side stand switch and switch on clutch lever. Both can cause problems. In this case the switch on the clutch lever may well be sticking and the engine is being stopped because the system believes you have started the bike in gear with the clutch engaged. ( Which is obviously not the case)
Cleaning / spraying with WD 40 or similar in the area of the switch may be all that is needed.
Hope this helps
Chances are strong the bike has a bent shift fork. This is a major repair requiring a complete engine tear down. As far as the leak goes, there is a shift shaft seal, drive-shaft ( sprocket shaft ) seal, Kick shaft seal. shift drum switch seal, crank shaft seals and clutch shaft seal. Also, there is the right outer case cover gasket, oil filler "O" ring seal, and the center case mating surface seal. The center case seal is actually a semi-liquid gasket compound applied to the mating surfaces prior to the center case re-assembly. The shift fork repair is not recommended for the unexperienced home mechanic. Below are the main parts if a Suzuki shift mechanism and a diagram of how the shift forks move left and right to change gears. Please rate my answer. Thanks!
If shaft and lever is undamaged, more than likely the gear selector shaft spring is misaligned or broken. Place in neutral. Remove pinch bolt from gear lever and remove lever. Undo covers and sprocket for access to selector mechanism.
The link below has exploded view diagrams and part numbers/names for the whole bike in sections.
Gear shifting is 6th from bottom of list.
Goodluck and Cheers.
Just below 6000 rpm on mine... also.. I could also only find 5 gears... its very easy to go through 2 gears instead of one. The other gears are there, just be gentle with the change lever and you should be fine.
If you still cant find them, put the bike on its centre stand and rotate the back wheel manually and change the gears by hand ...you should find em all.
Yes it does have either a "sir-clip" or a "C-clip" that holds the shaft in place. You mentioned the bike was dropped, this is very typical when that happens. If the lever is part of a linkage system you will find a groove on the shaft that that is moving where the clip belongs. If it is a sir-clip there is a good chance it is just popped off the groove and all you may have to do is slip it back on by pushing it with a screw driver, if the clip is gone you may be able to measure the shaft diameter and go to the local automotive parts house and get a standard snap ring that will fit your shaft.