REDS 521 Competizione S-Line 3.5cc (.21) Off Road Nitro Engine Combo

The REDS 521 Competizione S-Line 3.5cc (.21) Off-Road Nitro Engine Combo pairs a 5-port competition engine with a matched 2143 Torque X-ONE pipe for 1/8 off-road applications. Its 3-needle aluminum carburetor supports precise, stable tuning, while the engine is designed for smooth and linear power delivery.

Features

• 5-port competition sleeve design
• 3.5cc (.21) off-road nitro engine
• 3-needle aluminum carburetor
• Steel crankshaft construction
• Steel rear bearing design
• High-stiffness die-cast crankcase
• Smooth and linear power delivery
• Improved fuel efficiency
• Easy and stable tuning
• Includes matched 2143 Torque X-ONE pipe

Specifications

• Displacement: .21 cu.in (3.5cc)
• Recommended Application: 1/8 Off-Road
• Bore: 0.64in (16.2mm)
• Stroke: 0.67in (16.9mm)
• Intake Ports: 5
• Exhaust Ports: 1
• Carburetor Type: VCX3-A Aluminum 3-Needle
• Glow Plug: REDS TS4
• Recommended Fuel: 25–30% Nitro, 8–10% Oil
• Break-In Fuel: 12% Oil
• Weight: 12.17oz (345g)

Includes

• (1) 521 Competizione S-Line 3.5cc (.21) Off-Road Nitro Engine
• (1) 2143 Torque X-ONE Pipe