FEATURES

The 321 Estremo has been one of REDS Racing’s most successful engines of the 2026 racing season, competing at the highest international level and winning the 2026 EFRA 1/8 Off-Road European Championship with Juan Carlos Canas Carrasco.

Building on this winning platform, the new Worlds Edition has been further developed to optimize performance, thermal management, reliability and consistency under the most demanding racing conditions.

WHAT'S NEW – WORLDS EDITION
The engine features a special Worlds Edition cooling head, specifically designed to improve thermal management in high ambient temperatures and during long, demanding runs.

More stable operating temperatures help maintain consistent carburetion and engine performance throughout the run, while also improving reliability under extreme racing conditions.

The 321 Estremo Worlds Edition is paired with the exclusive 2143 XONE Worlds Edition exhaust featuring OXD surface treatment.

The OXD treatment provides increased protection against wear and deterioration caused by intensive use and high operating temperatures. In addition, it contributes to improved exhaust gas temperature management, helping increase engine performance, efficiency and consistency of the complete engine–exhaust system.

RECOMMENDED SETUP
Exhaust: 2143 XONE Worlds Edition OXD
Venturi: 6 mm Buggy / 7 mm Truggy
Clutch: Tetra-X – 4 Aluminium Shoes – Medium Setup
Glow Plug: REDS TS3

Specifications

Category: 1/8 Buggy and Truggy
Displacement: 3.5 cm³
Bore x Stroke: 16.4 × 16.4 mm
Ports: 3 intake, 1 exhaust
Front Bearing: 7×19×6 with high-performance seal
Rear Bearing: 14×25.4×6 – 9-ball high-durability ceramic bearing
Carburetor: OS 21J with Venturi XFlow
Venturi Diameter: 7 mm (optional: 6 mm or 8 mm – body 9 mm)
Backplate: AirBoost™ DLC-coated
Crankshaft: DLC-coated with two tungsten balancing weights
Weight: 345 g
Recommended Fuel: 16–30% nitro with 8–10% oil
Glow Plug: REDS TS3 or TS4
Exhaust System: 2143 X-ONE X Line
Clutch: REDS TETRA-X

Part number: REDCOBU0041