OS SPEED 21 VZ-B V-Spec. (Bug Graupner 2720

OS SPEED 21 VZ-B V-Spec. (Bug Graupner 2720 3.46 cc capacity. Mark Pavidis wins the 2006 1 : 8 Off-road World Championships in Jakarta with OS-Speed power.

- Magnesium heat-sink head: 30% weight reduction
- Ceramic ballraces
- Modified, hard-coated, finely balanced crankshaft
- Modified piston / cylinder
- Modified carburettor
- Red eloxided aluminium venturi inserts, sizes 7, 8 and 9

Capacity [cc]: 3.46
Power approx.[kW (BHP)]: 1.84 (2.5) at 34,000 rpm
Rotational speed approx.[rpm]: 3,000 - 40,000
Bore [mm]: 16.6
Stroke[mm]: 16.0
Carburettor: 21 H
Shaft thread: 1/4"-28 UNF
Weight approx.[g]: 320.5