- 3480 engine, 344 chassis, JAP KOY / W 3480 S engine
- JAP single-cylinder 4-stroke engine with dual exhaust, 490 cm3 (85.7 x 85), 19 hp at 4000 rpm
- Overhead valves
- Magneto ignition
- STURMEY-ARCHER 3-speed gearbox on right-hand side
- ALPAX light alloy beam frame acting as an oil reservoir in its lower section
- Parallelogram front fork suspension
- Coupled front/rear braking on right foot with distributor
- No rear suspension