Not knowing anything about older drive shaft bikes.
You can change sprocket on chain drive bike, has any of the older drive shaft bikes every came out with different
aftermarket gearing for them ?
If so, what sites might carry them ?
I had a shaft drive on my '82 Yamaha 650, and never heard of any aftermarket shafts being made. Might just be economics - sprockets can be used on a lot of different bikes, but drive shafts might be unique(?)
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