O.S. Engine have released photos and specifications about their forthcoming Max-R21 3.5cc nitro on-road engine. Based off of the O.S Speed R2102, we undestand that the Max-R21 would be compatible with R2102’s parts, offrering high performance for a more attractive price.
- Displacement: 3.49cc
- Bore: 16.08mm
- Stroke: 17.2mm
- Power output: 2.75HP/33,000RPM
- Practical range: 4,000 – 44,000RPM
- Weight: 350g