Reds 321 ESTREMO™ X Line Off-Road Engine

#RedsRacing is pleased to introduce a major evolution within its range of high-end nitro off-road racing engines.

As part of this development, Reds Racing unveils a completely new family of engines named X Line, which will complement the current flagship 721 Superveloce Gen5 – S Line Version 2026.

The new X Line range debuts with the 321 ESTREMO™, a 3-port engine designed to offer a driving character different from that of the famous 721 S Line platform.

The 721 S Line will continue to be fully produced in Italy, preserving the same philosophy, the same technical approach and the same performance characteristics that have defined it over the years.

The new 321 engine is made in Japan (at the OS Engines plant) and has been developed entirely according to Reds Racing's design, engineering and testing specifications. The final assembly and tuning are performed directly by Mario Rossi and Marco Rossi, thus guaranteeing the performance standards and the precision expected from Reds Racing engines.

A collaboration between two icons of RC engine technology.

The development of the new 321 ESTREMO™ represents a significant collaboration between REDS Racing and one of the most respected companies in the RC engine industry, O.S. Engines.

REDS Racing was founded by Mario Rossi, one of the most influential figures in the history of RC engines and co-founder of the legendary Novarossi brand since 1984. His decades of experience in designing high-performance racing engines have helped shape some of the most capable engines ever produced.

By combining Italian race engineering and REDS Racing's development philosophy with Japanese manufacturing expertise and engineering precision, this project brings together the best of both worlds.

The result of this collaboration is a new engine platform designed to deliver performance, reliability and exceptional handling: an engine that represents the perfect blend of Italian passion for racing and Japanese manufacturing excellence.

Two engines, two racing philosophies.

With the launch of the 321 ESTREMO, Reds Racing now offers two distinct engine platforms, designed to adapt to different track conditions and driving styles.

REDS 321 ESTREMO

• Three-ports engine architecture

• 21J carburetor

• AirBoost™ backplate

• XFlow™ Venturi

• Powerful torque and acceleration at low RPM

• Excellent throttle response and handling

• Designed for technical circuits with big jumps

• Ideal for American-style tracks and demanding off-road conditions