1000 gearbox into a 750
- Thread starter CLEMTOG
- Start date
B
bob
Guest
Dunno about that Clem but I seem to recall Gavin Spencer tried to do the opposite [SFC 750 gearbox into a series 1 180] and I'm fairly certain it didn't fit. Might be an idea to give Gav a quick ring and ask him.
Clem,
Yes... and no.
Although they are basically the same gearbox, the 750 mainshaft is shorter and several ratios do not match.
The 5th gear sprockets are the same in both boxes, but other ratios need to be swapped as pairs if you use one box to repair another.
piet
Yes... and no.
Although they are basically the same gearbox, the 750 mainshaft is shorter and several ratios do not match.
The 5th gear sprockets are the same in both boxes, but other ratios need to be swapped as pairs if you use one box to repair another.
piet
CLEMTOG
Hero member
not quite what I was after Piet, I would like to fit the whole caboodle, and get the triple ratios into a 750, I am aware that the mainshaft is a different length, and the clutch on the 750 is a smaller diameter, I do have a triple gearbox cluster and selectors but not any 750 parts, it sound like its probably not worth the grief.
CLEM
CLEM
Just swap the cogs.
HansL
Senior member
- Location
- Netherlands
Cluster is the same, except for the notch which activates the neutral switch.
Hans
Hans
Selector drum and shafts are interchangable as a set due to opposed orientation of the internal shift lever mechanism. Selector forks are identical, except for very early 750 1st./2nd. gear forks that are not notched for clearance to later larger 1st. gear layshaft sprocket. 2nd, 3rd. and 4th gear sprockets can be swapped to and fro to attain either wider or closer spaced ratios. Either way, you end up with a big gap somewhere along the line... 
Some triple gears are the same tooth count as the corresponding 750SFC gears. (3rd? 4th? dunno, couldn't be bothered looking it up)
Guess the gear change shaft from one to the other model can be used to alter the gear change pattern to up-for-down/down-for-up, preferred by many racers. Probably takes a bit of fiddling with the selector shaft that works the drum. Increases the pressures required at the shift lever if installing 750 bits in a triple though.
piet
Some triple gears are the same tooth count as the corresponding 750SFC gears. (3rd? 4th? dunno, couldn't be bothered looking it up)
Guess the gear change shaft from one to the other model can be used to alter the gear change pattern to up-for-down/down-for-up, preferred by many racers. Probably takes a bit of fiddling with the selector shaft that works the drum. Increases the pressures required at the shift lever if installing 750 bits in a triple though.
piet