O.S. MAX R21 1B900

The O.S. MAX R21 club-level nitro on-road engine.
The power plant targets club level drivers and it features compatibility of sparepart of the R2101/R2102 and R2103.

Tech specifications:

• Displacement: 3.49 cc
• Bore: 16.08mm
• Stroke: 17.20mm
• Practical RPM range: 4,000 – 44,000 rpm
• Weight: 340Gr