How do you adjust idle on 1987 BMW k75?

Same way on all k75 k100 motorcycles. With the engine off twist the throttle and look at the the part that moves on the throttle bodies about 1 foot below the gas tank near your left knee as you are sitting on the motorcycle. Make sure the bike is fully warmed up - take it for a 10 minute ride. Aim for about 1000 rpms at idle. Loosen the lock nut and turn the screw clockwise to increase the idle and counter clockwise to lower it. MrbiOS '92 k75s w/ 63K miles San Diego, ca To balance the 4 (or 3) cylinders, you will need a carb stix or similar device, to measure (and balance) them as you adjust the idle screws.