Z1 vs Z900 vs Z1000 Alternator rotor

I would have used the key.
Steve

You must fit the woodruff key, especially with the decreased contact area of the scored taper.
The 8mm bolt on its own isn't enough to stop the rotor spinning loose and increasing the torque will cause the bolt to shear.
This is why they increased the bolt size to 10mm and increased the torque when they stopped using a key.

Ok. I'll fit the key before riding

Would you use more than the 18Ft/lb torque on the rotor bolt?? . Keep in mind my bike does easily rev to the rev limiting of 10K rpm

Bozo wrote: Ok. I'll fit the key before riding

Would you use more than the 18Ft/lb torque on the rotor bolt?? . Keep in mind my bike does easily rev to the rev limiting of 10K rpm

Bump, Zed/Steve, see question above

That's what the book says. I just do it by hand. I had a problem with the rotor coming loose so I used blue lock tight on the taper. The rotor was coming apart later and I had to heat it up with a torch to get it off. If yours is in good shape and fits the taper well, it should stay on. Just use lock tight on the bolt.
Steve

Bozo wrote:

Bozo wrote: Ok. I'll fit the key before riding

Would you use more than the 18Ft/lb torque on the rotor bolt?? . Keep in mind my bike does easily rev to the rev limiting of 10K rpm

Bump, Zed/Steve, see question above

Just go with the std torque setting and Loctite on the bolt threads only.
Any more torque is just risking stretching the bolt and having it fail.
The rpm's aren't really the issue, it's the force on rapid acceleration that shears the fit between the rotor and crank.
My Supercharged Z1000A revs like a 2 stroke and will hit 12k if I let it, It too has a 900 crank and has done 1000's of miles with no problem.

I did as suggested, I also checked the fitting with the wider rubber washer, it is 0.7mm thicker which is a fair bit, and it did push against the rotor hard, so that might've caused the rotor not to tighten on the taper properly. Anyway I'll rechecked this unit (assuming it doesn't rattle beforehand) in a month just to be safe.