Graupner,OS MAX 21 VZ-B V-Spec,2721

OS MAX 21 VZ-B V-Spec Graupner 2721 The new OS MAX 21 VZ-B »V Spec.« motor is a real eye-catcher with its futuristic heat-sink head design and black crankcase. A new »Turbo« head insert has been designed exclusively for this motor, including the new P3 turbo-glowplug; this was required in order to achieve the special combustion chamber shape and the optimum compression ratio. The valve timing of the intake / exhaust ports and the transfer channels in the cylinder liner have also been further developed, and the type 21C carburettor is also new. It is possible to select different throat diameters by simple swapping the carburettor inserts, according to the need for reduced fuel consumption or »High Power«.

Capacity 3.46 cc
Power approx. kW (BHP) 1.82 (2.48) at 33,000 rpm
Speed range approx. 3000 ~ 40,000 rpm
Bore 16.6 mm
Stroke 16 mm
Carburettor 21C
Shaft thread ¼"-28 UNF
Weight 360 g (excl. air filter)