Page 6-62 of the service manual describes how to inspect engine idle speed, but it really looks like an inspection of throttle-body synchronization. It says to check that the vacuum difference is within 30 mmHg, and if not, check the usual: valve clearance, ignition timing, and clogged exhaust. If these aren't causing the problem, replace the throttle-body assembly. They have to be kidding: What's the matter with adjusting the synchronization screws like I do with the 6 carbs on my CBX? Has anyone else looked at this?