BF motorcycles are in Knysna (Motorcycle graveyard). Beaming is in George(workshop owned by Donovan). Both reputable, but have no idea about the second hand section in George.
To my knowledge the smalest four stroke motor for a microlight from Rotax is the 912 wich is a four cylinder motor. Two strokes there are many smaller ones.
Ek verdink vir General Lee, as ek nie die pot mis sit nie werk hy by daardie kantore aan die onderkant van Majik Forest, een dan ook die kwessie van die swart helmut!