Lots of bikes in that period had right hand drive chain.
All the yamaha sports bikes up to the one you posted did.
The one you posted was called the YDS6 in the UK.
The model after it, the YDS7 looked like the first RD in the motor in the motor department but without the reed blocks.
Even Honda had some right side drive models in the Dream and Super Dream series.
These consisted of the C72 and C77 tourers and the CB72 and CB77 sports bikes.
If my memory is correct, the kick start on the sports models kicked forward, know THATS what you call unusual.
Sam.
