OS MAX 21 XZ-R Ver.II Graupner 2791

OS MAX 21 XZ-R Vers. II Graupner 2791 Description
The OS MAX 21 XZ-R Vers. II motor was developed especially for onroad competition in the 1:8 scale. In addition to perfect performance and "drivability", the greatest focus was placed on the already legendary workmanship and long life of OS motors. This OS symbiosis of quality and outstanding performance is now also available for everyone in the segment of 1:8 onroad models. Equipped with the new 21M carburettor, the RP7 spark plug for turbo combustion chambers, and a special cooling head, it leaves nothing to be desired.
Engl. Instructions

Specification
Width : 45 mm
Shaft thread: 1/4"-28 UNF
Distance of screw hole /longitudinal: 21 mm
Carburettor : 21M
All-up weight, approx.: 343 g
Height approx.: - mm
Recommended for : Onroad models M 1:8
Diameter of fixing hole: 3,3 mm
rpm range, approx.: 4000-45000 U/min
Bore: 16,27 mm
Distance of screw hole / crosswise: 37 mm
Cylinder capacity: 3,49 cm³
Output (kW, PS) at: 2,1 (2,71) at 33000 U/min
Length to hub: 69,9 mm
Stroke: 16,8 mm