O.S. Max-R21 3.5cc nitro on-road engine

O.S. Engine have released first information on their forthcoming Max-R21 3.5cc nitro on-road engine. The power plant is based off of the O.S Speed R2102, however it is understood the engine received a make-over in many aspects to make it more affordable yet easy to tune. More information will become available in time for the release.

Specifications:
– Displacement: 3.49cc
– Bore: 16.08mm
– Stroke: 17.2mm
– Power output: 2.75HP/33,000RPM
– Practical range: 4,000 – 44,000RPM
– Weight: 350g

Source: O.S. Engine [os-engines.co.jp]