High-Performance Reliability for On-Road Racing
This is the 521 GTS Gen3 3.5cc (.21) On-Road Nitro Engine from REDS, engineered to deliver outstanding power, durability, and efficiency for competitive on-road racing. Built with a high-strength steel crankshaft and precision-tuned internals, this engine ensures long-lasting performance under extreme conditions. With advanced cooling features and optimized fuel efficiency, the 521 GTS Gen3 is designed to provide racers with consistent power and reliability on the toughest tracks. Additionally this version offers a Pre Break-In by the world renowned Mario Rossi providing you with a top tier engine experience.
About the 521 GTS
Precision Engineering for Maximum Durability
The 521 GTS Gen3 is built with a reinforced steel crankshaft, enhancing durability and reducing wear over extended use. Its optimized porting and internal design provide smooth throttle response and improved acceleration. Additionally, the advanced cooling system ensures stable performance even in high-temperature racing conditions, making it an excellent choice for demanding on-road environments.
Features:
- 3.5cc (.21) displacement for powerful on-road performance
- High-strength steel crankshaft for superior durability
- Optimized porting for smooth throttle response and acceleration
- Advanced cooling system for consistent performance
- High fuel efficiency for extended run times
- Precision-machined internals for maximum reliability
- Designed for 1/8 on-road racing applications
- Durable steel ball bearings
Includes:
- (1) 521 GTS Gen3 3.5cc (.21) On Road Nitro Engine (Steel) w/Pre Break-In by Mario Rossi
Specifications:
| Displacement | .21 cu.in (3.5cc) |
|---|---|
| Recommended Application | 1/8 On-Road |
| Bore | 0.64in (16.2mm) |
| Stroke | 0.67in (16.9mm) |
| Output | – |
| Intake Ports | 5 |
| Exhaust Ports | 1 |
| Practical RPM | – |
| Weight | 12.17oz (345g) |
This product was added to our catalog on February 28, 2025
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