Friend of mine bought a CB400 with a sticker on the side cover saying "version R". He figures it's a '95 or a '96, the obvious difference is a small fairing around the headlight. We both wonder what's up with the "R" designation; is it just cosmetic or does it have more power? How can you find the exact model year? By frame number? Also he'd like to get an english manual for the bike - any suggestions?