I need to replace the chain on my 94 F2 and want to lower the gearing for shorter tracks like Putnam and BH. I've heard either -1 front, or -1 front and +2 rear. Anyone out there with a similar bike have any advice? Also, since I'm a trackday addicted rider, but not racing, is it worth going to a 520 chain? (It's not set up yet to be a track only bike). Thanks, DO