OS MAX SPEED 21 V-SPEC 2 Graupner 2744

OS MAX SPEED 21 V-SPEC 2 Graupner 2744 3.46 cc capacity
Atsushi Hara won the 2008 1 : 8 World Off-Road Championships in North Carolina, USA with the OS SPEED POWER 21 VZ-B V-Spec II.

Aluminium heat-sink head for lower weight
Ceramic ballraces
Modified hard-plated crankshaft, finely dynamicallybalanced
Modified piston and liner
Modified Type 21 JS carburettor
Venturi inserts in sizes 7, 8 and 9, red eloxided aluminium

Capacity 3.46 cc
Power approx. kW (BHP): 1.84 (2.5) at 34,000 rpm
Speed range approx. 3000~40000 Rpm
Bore: 16.6 mm
Stroke: 16.0 mm
Carburettor: 21JS
Shaft thread: 1/4"-24 UNF
Weight 349 g