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REDS Racing R5R Racer V4.0 .21 nitro engine

Product Description

The new R5R 4.0 has been provided with a brand new 5 ports sleeve and crankshaft timing. The engine is designed with improved fuel efficiency and drivability in mind and is suitable for both Buggy and Truggy.


The Racer is one of the most advanced and innovative products on the market, equipped with the best technology to improve reliability and guarantee the best performance on all terrains. R5R Racer factory tuned guarantees the same performance as a Pro engine at reasonable price.

Every single engine is hand inspected and compression checked inside REDS Racing headquarters by Mario and Marco Rossi to achieve the highest quality standards. This is core to the values that makes the 4.0 different from any other engine brand on the market.

R5R RACER main features: 5 ports sleeve with boosters, HCX Horizontal carburetor, silicon filled and tuned crankshaft, high sealing made in Japan front bearing, Swiss made steel high quality rear bearing.

The engine is designed to be used with the REDS pipes 2143 or 2104 with the S manifold and REDS “one touch” effortless clutch system.

2104 for a smoother power delivery and more top speed.
2143 for more torque and mid range power.


  • Displacement: 3,5 cc 
  • Bore: 16,26 mm
  • Stroke: 16,80 mm
  • Weight: 348 g
  • Front Bearing Dim: 7x19x6
  • Rear Bearing Dim: 15x25.4x6
  • Recommended Pipe: EFRA 2143, 2104 w/S manifold

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