Why not call Bobby at Cactus 520-721-0087 or Gerhard at AircraftInternational 731-761-0997.
www.cactusaviation.com
www.aircraftinternational.com
The instruction manual that comes with purchased engines doesn't offer a parts listing, or exploded view either. I would imagine this is due to a pretty low parts count on 2 stroke engines. You'll have to give one of these guys a call.