I have an '85 GL1200LTD "fuel injected" that I bought about 2 months ago. I have been over it, did all the maintenance, rebuilt the brakes, did the final drive maintenance, oil, filters, belt change, and several other minor problems. It runs and rides great, but has one problem that is about to drive me crazy. First off, it has a vacuum leak somewhere in the intake system, which I have been unable to find. I know it is there, because when I spray carb cleaner in the area, the idle drops instantly. The other problem, which I think is actually part of the vacuum leak issue, is a really strange noise. It makes a high pitched er er er er er er er er noise when it is running. It is a very steady pulsing noise, and will do it even when the engine is just being turned by the starter, and not actually running. I would think a vacuum leak would make a steady sssssssss noise, but maybe not. I have replaced most of the vacuum lines on the intake system, but there may be something back in there I missed. Spark plugs are new and tight, compression is within spec for a new engine, and very close on all 4 cylinders. Anybody have any ideas? Bob.