The REDS 721 Pista S Series .21 Competition On-Road Nitro Engine features extreme power, high reliability and tuning stability. Combined with specific changes in the porting and materials, this 7 port engine features higher power and better fuel efficiency compared to any other engine. The engine comes with a DLC Coated crankshaft and backplate for improved engine durability. The crankshaft can last approximately 3 times longer than a standard crankshaft thanks to the extreme hardness of the diamond coating. Even the conrod life is lengthened about 50%.
REDS recommends the 2113 pipe and M on-road manifold, with REDS original spare parts and accessories for the best performance.
- Crankcase design: REDS Racing S line features a unique high stiffness crankcase design. It is all updated materials and casting technology. The engine is produced with pressure die casting, this is a very high quality process, as opposed to the M line crankcase that was manufactured with a gravity casting process.
- Carburetor and Venturi: Another big improvement is the updated aluminum carburetor made from pressure die casting. The carburetor materials have been changed from plastic to aluminum to further improve idle stability and tuning. On a technical note, the carburetor is 30° inclined for better fluid dynamics to increase engine power.
- Materials: S line features updated materials for the piston, sleeve and crankcase in order to optimize thermal expansion and improve power. The idea was to develop a high power engine even more powerful than previous Reds Racing engines with exceptional fuel mileage. This goal has been achieved.
- 7 Port Sleeve: A high torque 7 port sleeve was used for great torque and power output. Basically, the exhaust boost design combined with the inlet ports layout ensures an increase in power throughout the entire RPM range.
This product was added to our catalog on March 30, 2021