2-takt "Debbie" 2-stroke "Debbie"
2-takt "Sabine" 2- stroke "Sabine"
Ridders- 4-takt roterende klep Ridders- 4- stroke rotary valve
Ridders Glas Duo 4-takt MK2 Ridders Glass Twin 4-stroke MK2
Ridders 1-cil. glas 4-takt Ridders 1-cyl. glass 4-stroke
Duale 2-takt Dual 2-stroke
Tandwiel voor tandriem maken Cog wheel for geared belt