Water pump.
Fan switch.
Exhaust seals.
If it's the water pump seals the oil will be chocolate brown from coolant getting past the load bearing lip seal. The resulting mess neither cools nor lubricates. You need a seal kit and enough fresh fluids to flush and replace.
The fan switch is mounted on it's side yet uses a gravity return! Jump the wires, set the fan running and see if the problem goes away. Replace the switch if it does.
If the exhaust is leaking at the header it will run hot rather than fully over heat. You need to replace the gaskets but tighten a quarter turn at a time on each bolt so it draws on very squarely. It was years ago when I last did this but IMHO the gasket was too thin. You could try using two or adding sealant.
Do not run this engine when over hot, that will warp the head and give the effects of a blown head gasket but at a much more expensive repair. If a new head gasket won't seal you need to lay the head on a glass plate and see how flat the surface is. The best solution if the head does warp probably involves a gallon of petrol a box of matches and a trip to the nearest place selling bikes without Rotax engines.
Andy
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