Thanks heaps for the help!

If I'm to adjust the jetting on a per-cylinder basis, how do I tell which is running rich and which is lean? I used to struggle as it was to tell if my cbr250 as a whole was running rich or lean unless it was really obvious. Is there any easier methods other than plug-chops? ( eg. by "feel" methods, like when its bogging down with slow response it tends to mean the bike as a whole is running rich).

I'm only mucking around and not getting to serious, so I might just set it up on the local dyno and get them to do it (but getting it re-dyno'd after every change is goign to get expensive! - not that I think they'd know the first thing about 2-strokes either!).