In order to adjust the valves (by installing different thickness shims) on a K75 or 2V K100, you need a couple of special tools: one to compress the valve spring and another to hold it down while you swap the shims. The Clymer manual lists these as part numbers 111720 and 111722 respectively. You can by them from BMW for $100 (see attached drawing below)
Or you can purchase some homemade ones:
(text from a post by Chaos)
Yes, "Valve Adjusting Tools" and “Clutch Pilots” are available for the BMW 2 valve "K" engine.
“Valve Adjusting Tools” (both K75 & K100) are 2 pieces made from 3/16” Laser cut steel. Working contours are identical to factory tools. "Valve Adjusting Tools" are new, from steel, w/ instructions.
"Valve Adjusting Tools" for BMW 2 valve "K" engines are $28 S/H included.
Clutch pilots for BMW K's (both K75 & K100) are available also. New, from steel.
Clutch Pilots for BMW K's , are $18.50 S/H included.
Cashiers Check, Money Order or Personal Check are welcome.
“Pay Pal” accepted also. Please apply “Pay Pal” to: firstname.lastname@example.org