Always fill to the lower of the two screw plugs on the side. Seen here wire-locked on the right hand side.
The gearbox is inverted on other set ups so the screw we see on top becomes their bottom one.
The oil needs replacing every 100 hrs or two years. Use the latest special type oil given in the most recent/current Rotax web manual.
One of my projects for next summer is a reduction gearbox for our garage.
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