Engine/Drivetrain

* High-output liquid-cooled DOHC 16-valve four-stroke engine features oversquare bore and stroke of 67mm x 42.5mm with a straight intake tract contributing to superb power throughout the rpm range* High-pressure programmed fuel injection (PGM-FI) delivers fuel to four injectors, each mounted in a 38mm throttle body, at 50 psi. Fuel is delivered through four nozzle tips in each injector, producing a highly combustible air/fuel charge for maximum combustion efficiency and power* A precise throttle sensor and sophisticated fuel injection mapping combine to produce smooth and linear throttle response, responding easily to fine throttle adjustments* Auto-enriching system is integrated into PGM-FI module, eliminating the need for a manual choke* Cylinder head features two springs per intake valve and hardened intake valve seats for even better high-rpm valve operation and durability* Inclined cylinder-head cover mating surface permits higher placement of the intake camshaft for a straight intake tract providing excellent engine efficiency and power* RC45-inspired aluminum composite cylinder sleeves are high-pressure-formed from sintered aluminum powder impregnated with ceramic and graphite. The lightweight composite sleeves provide better wear resistance and superior heat dissipation than conventional sleeves* Aluminum alloy pistons feature LUB-Coat solid lubricant to minimize friction between the piston and cylinder wall* Ram-air provides a high volume of cool air to the airbox, utilizing a two-stage system that precisely balances air pressure within the carburetor float and vacuum chambers with the air flowing through their bores, providing sharp throttle response, linear power delivery and incredible performance at all speeds* Four transistorized direct-ignition coils integrate spark plug cap and high-tension lead to produce a high-voltage, long-duration spark, providing maximum performance at high engine output levels* Electronic ignition CPU provides digital 3-D mapping for individual cylinders, creating ideal spark advance settings for all riding conditions* Four-into-two-into-one exhaust system feeds single high-output polished stainless steel muffler for maximum power and efficiency* Direct shim-under-bucket valve actuation ensures high-rpm performance and durability and offers 16,000-mile maintenance intervals* Mechanical automatic cam-chain tensioner* Engine cooling system features a series-flow pattern that reduces piston crown and spark plug seat temperatures, resulting in increased power* Bearingless water pump is lightweight and features high-efficiency design* High-capacity liquid-cooled oil cooler contributes to lightweight engine design* Clutch cover integrates pulser cover and is lighter than traditional designs* Smooth-shifting close-ratio six-speed transmission features ratios carefully matched to engine's powerband