My 2003 M620Dark with 4000mi was put away for the winter recently, I have made an effort to start it up about once a week just to keep oil in the cylinders, battery somewhat fresh, etc... For some reason when I started it up last week and with the choke open it idled at 1000rpm! the engine seemed to make a strange clicking sound that may or may not have been there before the problems started and was just covered up by the engine working properly (could be normal engine noise). Anyway, my buddy who owns a 900 was telling me it sounded like it was firing on 1 cylinder. I had taken it out for a short drive and it had no power at all. I would have to rev it up to 4000rpm and then release the clutch at which point the revs would go down to 2000rpm and the bike would lurch away. This was not good!!! Is there anything else I can check for myself besides the plugs being fouled? Even if that's the problem, what could I do to fix it? I would like to get a rough idea before taking it to the dealer.