GBP
Description
The REDS 321 Engine Set Estremo Worlds Edition 16% with 2143 OXD Pipe, part REDCOBU0040, is a 3.5 cm³ nitro engine and exhaust system for suggested use in 1/8 buggy and truggy applications. Developed from the 321 Estremo platform used during the 2026 racing season, this Worlds Edition combines a dedicated cooling head with the 2143 XONE Worlds Edition exhaust featuring OXD surface treatment.
The Worlds Edition cooling head is designed to manage operating temperatures during high ambient temperatures and extended runs. More stable temperatures help maintain carburetion and engine performance throughout a run, while the OXD treatment protects the exhaust against wear and deterioration caused by intensive use and high temperatures. The treatment also supports exhaust gas temperature management across the engine and exhaust system.
The engine uses an OS 21J carburettor with XFlow Venturi, supplied with a 7 mm Venturi and listed with optional 6 mm or 8 mm alternatives. The recommended setup includes the REDS TETRA-X clutch with four aluminium shoes and a medium setup, together with a REDS TS3 glow plug. Recommended fuel is 16–30% nitro with 8–10% oil.
Specifications
- Displacement: 3.5 cm³
- Bore and stroke: 16.4 × 16.4 mm
- Ports: 3 intake and 1 exhaust
- Front bearing: 7 × 19 × 6 with sealed design
- Rear bearing: 14 × 25.4 × 6 ceramic bearing with 9 balls
- Weight: 345 g
- Crankshaft: DLC-coated with two tungsten balancing weights
- Exhaust system: 2143 X-ONE X Line
Secured by Stripe
Specifications
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 <Technical 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
Key Info:
- Brand: REDS
- Part No: REDCOBU0040
- Barcode: 793269888273
- Displacement: 3.5cc (0.21ci)
- Starter: Flywheel Start
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