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Is there any issues to being �overpowered�?
Hi Mick
In this case - NO!

The 13 Series was an engine from the old school - smaller bore; longer stroke.
To my knowledge, the 13 was used on 21" walk-behind up to 26" ride-ons.
With its CI flywheel it produced max torque at a lower RPM than modern designs.

You have the latter engine with dual element air-cleaner, but before electronic ignition.
As I said, a sensible approach.

Cheers
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Jack