John's comments are okay for a 200, but not for a 220. The pistons break, and when they do, the damage done ranges from simply replacing the piston and rings to the skirt jamming into and destroying the cases ($1200 US). I bought an '04 220 last year and rode it for 1/2 a season, then tore it down and put a wiseco piston in it. If I was doing it over again, I would probably change the piston before riding it at all, just to save having to break it in twice. As for greasing , you need to grease every joint in the suspension linkage, the swing arm bearings, and the steering head bearings.
Good Luck,
Mike.