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.21 Engines Off Road
> REDS Racing R5R RACER 4.0 .21 Off-Road Competition Nitro Buggy Engine
REDS Racing R5R RACER 4.0 .21 Off-Road Competition Nitro Buggy Engine
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The perfect synthesis of inovation, high quality and great performance at a mid range street price. Everything that makes the 4.0 unique today is an extraordinary step forward. The New R5R has been redesigned with a brand new 5 ports sleeve and crankshaft timing. The engine is designed with improved fuel efficiency and drivability in mind and is suitable for both Buggy and Truggy.
R5R Racer tuned by M.Rossi guarantees the same performance as a Pro engine at reasonable price. The 4.0 is one of the most advanced and innovative products on the market, equipped with the best technology to improve reliability and guarantee the best performance on all terrains: HCX horizontal carburetor, silicon filled and tuned crankshaft, sleeve with 5 inlet ports and classic exhaust port, high sealing front bearing, rear steel high quality chrome steel bearing.
ADVANCED CARB SYSTEM
The revolutionary carb features a differently positioned top end needle, rather than a conventional carburetor pointing diagonally upwards. The REDS HCX is horizontally positioned lower down making REDS the only company with this set-up: greater idle stability ; more precise tuning ; easier access to high speed needle ; higher mid/top range power.
LIGHTWEIGHT & LOW GRAVITY CENTER
We designed the new REDS Factory Tuned line to be not only more powerful and reliable but lighter and with lower gravity center than ever before. To do that, we couldn’t just shave a millimeter here, a gram there. So we started from scratch, redesigning each essential part like crankcase, cooling head, combustion chamber and Black Diamond coated backplate.
HANDMADE, TUNED AND ASSEMBLED
The 4.0 is hand-tuned by M. Rossi. Every single engine is hand inspected and compression checked inside REDS Racing headquarters by Mario and Marco Rossi to achieve the highest quality standards. This is core to the values that makes the 4.0 different from any other engine brand on the market.
LONG STROKE - R5R crankshaft is surprisingly strong and reliable thanks to our special steel and heat treatment.Our special silicone filling reduces the inertia to rotation.
5 PORTS & BOOSTERS - The sleeve with 5 inlet ports and exhaust port with boosters guarantees high power at each RPM and low fuel consumption. Our flat piston, made from a high strength aluminium bar, is a true masterpiece of engineering.
FLAT BILLET PISTON - Our flat piston matched to a specific combustion chamber guarantees high performance and low consumption. Lightweight, durable and reliable is the standard quality of our connecting rod. The slim shape is designed to minimize aerodynamic friction.
HIGH QUALITY BEARINGS - The new high sealing and high reliability made in Japan front ball bearing ensures high idle stability. The 100Cr6 Swiss Made rear bearing ensures longer life and low friction at high temperatures.
Front ball bearing dimension DixDexS [mm]
Front ball bearing features
rubber seal made in Japan
Rear ball bearing dimension DixDexS [mm]
Rear ball bearing features
Swiss made steel
Carburetor diameter [mm]
HCX Long needle
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