BMW Motorcycle R1100/850 Operations Manual Service Bulletin Subject: R1100/850 Model Throttle Cables Problem: Engine surges at constant speed. Difficult to adjust and balance the left and right throttle bodies. Cause: Differences in opening and closing of the throttle butterflies caused by friction in the throttle cable. Remedy: 1. Fit a low friction throttle cable. 2. Check the following to ensure optimum results: Ignition timing Spark plugs (FR 6DDC) type / condition (reference SI 2739 in Main Group 12) Valve clearances Read the rest of this entry »