The DOHC liquid-cooled parallel-twin engine uses a square bore & stroke of 67 mm x 66.8 mm for an optimum!! The 67 mm bore size is the same as used on the CBR600RR. PGM-FI electronic fuel injection keeps the engine running efficiently in all conditions and ensures crisp throttle response. Careful flow analysis of the cooling system resulted in a water pump that’s small and lightweight, yet still more than capable of keeping the engine running its best at high output levels. In order to maximize air-intake and exhaust efficiency, the profile from the air cleaner through the intake ports to the exhaust pipe was made as straight as possible. The four valves in each of the DOHC cylinder heads have narrow stems, thereby reducing weight and friction and increasing efficiency. A shorter muffler with redesigned internal structure produces an authoritative exhaust note and improves the bike’s mass centralization. The pins in the silent cam chain have been treated with vanadium, which both reduces friction and improves durability. The lightweight pistons use the same advanced manufacturing process as those found in the CBR600RR. To ensure precise cylinder shape, the engine uses the same centrifugal-cast thin-wall sleeves as found in the CBR600RR!!
Engine Type: Liquid-cooled parallel twin
Displacement: 471 cc
Bore & Stroke: 67 mm x 66.8 mm
Compression Ratio: 10.7:1
Valve Train: Chain-driven DOHC, 4 valves per cylinder
Fuel Delivery: PGM-FI electronic fuel injection
Final Drive: #520 O-ring-sealed chain
Front Suspension: 41 mm telescopic fork with spring preload adjustment; 108 mm (4.3 in.) travel
Rear Suspension: Pro-Link single shock with spring preload adjustment; 119 mm (4.7 in.) travel
*Values do not include freight and PDI, License, insurance, registration, applicable taxes, levies and fees.
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