Aha, another noise to worry about then.
Hi Micheal and welcome to TM - Three Wheeler Chapter.
The problem is that they all do all sorts of things, and as Peter said, get reading to find out what. Your noise doesn't actually sound like anything reported yet, but could be the bevel box whine, though this is not normally as high pitched as you have described.
If you buy one, they are fantastic fun, but you must go in with your eyes wide open, and be prepared for some or a lot of fettling, truth be told a little fettling is part of the fun.
Don't hesitate to get back to us on here with any or all of your questions, we're a really friendly and helpful bunch.
