Hello Harvo

At least you now know the ratio now.

I'm sure you will solve this issue.
Please keep us informed as to your progress - as this is valuable
information for members repairing aging Rover ride-ons.

It would appear that the axle assembly (with sprocket) is still available.
It would be A10336 (replacing A10242).

https://www.outdoorking-forum.com.au/index.p...arch_in_description=1&keyword=A10336

Hope this helps.
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Jack