74 mm center.
it does actually have the Yamaha logo on it.. so I know I am in the right ballpark.
That JT Sprockets site is killer. I got these from Dock.. who got them from someone else.. so they were labeled as RD400 but we were never sure.
Worth noting that the sprocket side of the hub got 2 bearings doubled up. Last piece I really need to find is the damn collar for that side. the ID of the bearings is larger on that side than it is on the other... yamaha put a collar in there to reduce it and act as a spacer. (I guess). so if anyone has one of those little guys floating around, I would be interested.
Clem.. whats the Honda behind your Daytona? CB160? (Daytona looks great... btw.)