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OS .21 RZ-M

The .21 RZ - custom engineered for serious racers.

The marine version of the ultra-high performance .21 RZ car racing engine. This little engine has a top end RPM of 40 000, and an amazing power output of 2.4 BHP, that'll supply all the power, response and speed you'll ever need.

  • Pressure regulation system increases transitional throttle response.
  • Sophisticated crankshaft design blends engine performance ingenuity and high-tech CNC machine work.
  • Polished intake ports allow smoother air flow.
  • Custom shaped piston reduces weight for quicker acceleration and better cooling.
  • Con rod features lighter, more durable bushing material.
  • Crankcase backplate features an O-ring for a better seal.
Displacement 0.211 cu.in (3.46 cc)
Bore 0.654 in (16.6 mm)
Stroke 0.630 in (16.0 mm)
RPM 3000 - 40000

Output

2.4 BHP @ 32000 RPM
Weight 13.03 oz (369 g)
   
Price R Not Available