Engine/Drivetrain

• Liquid-cooled DOHC 16-valve 999cc four-stroke inline four-cylinder engine features bore and stroke dimensions of 76mm x 55.1mm.
  
• Sixteen-valve cylinder head features 30.5mm intake and 24mm exhaust valves with a 12.3:1 compression ratio for efficient combustion and high horsepower.
  
• Larger titanium intake valves create a lighter valve train for higher rpm.
  
• Intake valves feature double-spring design for optimum performance at high rpm.
  
• Intake ports use new shot-peening technology that improves power and torque characteristics.
  
• Cam-pulser location between the middle cylinders allows a narrower cylinder head and frame.
  
• Direct shim-under-bucket valve actuation system ensures high-rpm durability and allows 16,000-mile valve maintenance intervals.
  
• Forged-aluminum pistons with molybdenum coating for reduced friction.
  Lightweight nutless connecting rods.
  
• Iridium-tip spark plugs improve fuel combustion and performance.
  Dual Stage Fuel Injection (DSFI).
  
• 46mm throttle bodies feature Denso injectors with lightweight valving for faster reaction time and 12 holes per injector to optimize mixture atomization, combustion efficiency and power.
  
• Auto-enriching system is integrated into programmed fuel injection (PGM-FI) module, eliminating the need for a manual choke.
  
• New idle-air control valve (IACV) minimizes torque reaction and smoothness response to small throttle changes through gradual reductions of air and fuel intake when the throttle is opened and closed.
  
• New Ignition Interrupt Control system works with IACV and FI mapping to enhance driveability.
  
• Smaller and lighter ECU provides two 3-D fuel-injection maps for each cylinder and two 3-D ignition maps for cylinder pairs, creating ideal fuel-mixture and spark-advance settings for superb rideability.
  
• MotoGP-derived twin ram-air system allows high volume of cooler air to the 9.7-liter airbox for linear power delivery and incredible engine performance.
  
• Butterfly valves inside the ram-air ducts open and close depending on throttle opening and engine rpm for optimum performance.
  
• High-capacity radiator incorporates twin cooling fans and allows a more compact cowl for reduced drag coefficient.
  
• Maintenance-free automatic cam-chain tensioner.
  
• Starter gears located on the right side to produce narrow engine and increased lean angle.
  
• Unique slipper-clutch design uses a center-cam-assist mechanism for easier actuation. Unlike an ordinary slipper clutch where the pressure plate moves side to side, the Honda clutch moves both the center cam assist and the pressure plate to provide additional slipper effect.
  
• Nine-plate clutch is compact and tough, featuring durable friction-plate material.
  
• New extremely compact exhaust system incorporates a catalyzer and control valve in mid-muffler design that reduces rear bodywork size and significantly improves mass centralization, reducing roll and yaw inertia.
  
• Durable #530 O-ring – sealed drive chain.