ssm gearboxes

[650xs]

hi i have several of these merc boxes with different numbers on them ,i don,t know which is what ...eg..j77h196.....j80e056.......580e05515...????? ??these are all off different powerheads but were used in uk on formular 3/4 cats,and poss on some monos,allpowered up to merc 700x or 650xs power heads,i have numerous props to suit aswell any one know which ratio they are????:cool: :rolleyes: ..also are these they used on twister 2 power heads?????

[Mark75H]

If they came off of 3 cylinder motors the ratio will probably be 13:16

They were used on Twister 2's with 15:16 or 14:14 gears

[alan akerstrom]

I have a NOS set of these to fit a SSM for 650x/700x. Someone needs to trade me for a NOS set of D merc gears!