TOPIC:

I have Z900 Motor in my race bike. 
I have a 1000J Falicon Crank in the motor. In order to use the Z900 Alternator cover I need to use the Z900 Rotor.
As you know the Z900 Crank has a 22mm taper and the 1000J has a 25mm taper.
Has anyone machined a RO99 Rotor to fit a 1000J Crank?
How did you do it. Do you have any dimensions?
Whats critical to ensure the stater clutch sprocket lines up?