What engine/bike?

[Chrisl]

What engine does this bike have in? Aircooled Rotax?

https://www.gumtree.co.za/a-motorcycles-scooters/other/armstrong-mt-500/1001082946640910011199209

 

[Chrisl]

 

[Woestynhond]

 

[witblitz]

 

[Woestynhond]

 

[Chrisl]

 

[2StrokeDan]

 

[LRFan]