are clutches used on the 550 the same as 1000?

[ashdricky]

I am trying to figure out if the clutch centerhub drive splines are the same on the big 8 valve motors as they are on the 550 motor, do they both use essentially the same clutch basket assembly just attached to different Primary drive gears? I am asking because I have recently had a breakthrough with the BTL clutch that I am making, and am thinking of possibilities for the larger bikes.

thanks - Rob

[78gs750e]

I know that the 77-79 750 clutches and basket are smaller than the 79 1000 so I would guess that the 550 would be smaller yet or the same as the 750

[ashdricky]

This is good to know, what about the drive splines that connect the center hub to the gearbox input shaft?

[GregT]

The answer is a tentative yes...a while back agemax commented somewhere that the splined tab washer used to lock the clutch center nut on his 1000 was common to a surprisingly large number of models.
He didn't post a list or link but may still have the information.

[ashdricky]

Thanks greg! this information is crucial, as it obviously means that the slipper clutch conversion could potentially fit the large bikes too, I will upload some new pics to the Clutch build thread tonight.

[78gs750e]

The splines are the same for sure, I put a 750 tranny in my 1000 and all i had to change was the shaft for the sproket due to it being longer.

[ashdricky]

excellent thank you,