Bill and Tim,
What I know is my A came from the factory with a fine spline. Once it snapped clean off in 2010 I did some research and found original Suzuki documents that said they worked out they were breaking and then made the larger course splined ones which appears to have been put on the last of the A's and then the B's.
Sorry if I got it confused in any way. Might have been a beer thing.
Tim, you should try Alpha Sports Suzuki in the USA for a course splined kick starter. I don't think you can buy the fine splined one or the fine splined shaft new anymore.
Pete