a 900 will go in without any problems, and the exhausts are the same size
Are you sure about the exhaust sizes? I know the 600 and 750 downpipes are the same part number (at least on the SS), but they look awfully restrictive for a 900.
Hi I did just this conversion started with a m600 dark 2000 fitted a 1997 900ss engine problems were 1/ single phase charging on SS sorted by just connecting to two of the where's on reg rec 2/ needed m900 exhaust headers as they are a different length 3/ needed oil cooler and hoses 4/ different neutral light switch wireing needs mod 5/ carbs are same size but different jet sizes use 900 dynajet kit 6/ need m900 inlet manifolds Engine bolts in no probs if you want any advise just ask done lots more mods aswell