ENGINE
Slim, compact, 847cc, DOHC, 4-valve, liquid-cooled, 42.5 degree inclined, inline-three cylinder engine. The engine has been tuned to provide plenty of low & mid-range torque with strong yet linear throttle response.
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engine meets or exceeds strict EU-4 regulations
4-valve, downdraft style combustion chamber
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excellent torque output... especially in the low to mid rpm range
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4-valve design maximizes flow into & out of combustion chamber
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31 mm intake & 25 mm exhaust valves
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valve angle is 26.5 degrees to keep combustion chamber compact
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stainless steel valves feature an Isonite surface treatment & carburized tips for excellent durability & wear resistance
Valve adjustment intervals are every 42,000 kms.
120 degree crankshaft with "even" 240 degree firing order.
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design reduces inertia torque while emphasizing linear torque in response to the rider's throttle action
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design has been optimized to achieve strong torque over a broad rpm range
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fast, linear throttle response
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engine design allows a whole new level of "rider - machine communication"
Lightweight "coupling force balancer" is used to reduce engine vibration for excellent rider comfort.
"Fracture split" connecting rods feature a "nut less" design.
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lower end "cap" of the rod is made from the same piece of material as the upper portion; the 2 pieces are "split" apart using a special fracturing process & then machined
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design aids in establishing true big end roundness & greater precision in con rod dimensions for excellent durability despite the high horsepower loads
Lightweight, forged, aluminum short skirt pistons.
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design aids in fast engine response
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reduces mechanical vibration
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excellent durability
Direct ceramic composite plated cylinder uses "liner less" bores
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ceramic coating sprayed directly on the aluminum block, eliminating the liner & reducing weight
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excellent heat dissipation for consistent power delivery
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coating enhances the thin film of oil between the cylinder & piston, reducing friction & increasing power
Offset cylinder design
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cylinder is "offset" relative to the crank (toward exhaust side)
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reduces frictional losses between the pistons & cylinder wall during the power stroke for improved power output
One-piece cylinder and upper crankcase assembly
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superior engine & chassis rigidity (engine is a stressed member)
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reduces weight
Lightweight hollow camshafts.
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cam profiles are designed for excellent torque in the low & mid rpm range
Crankcases feature a "Tri-Axis" layout for the crank, main & drive axles.
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creates a more compact & shorter engine front to back
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shorter engine allows for optimum engine placement in the "sweet spot" of frame for desired weight distribution & great handling
"Closed loop" 41 mm Mikuni throttle body fuel injection system.
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system uses throttle position sensor (TPS) & acceleration position sensor (APS)
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injectors feature 12 holes & 20 degree spray pattern
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injectors spray fuel directly at the intake valve
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"closed loop system" uses an oxygen sensor to "sniff" spent exhaust & automatically adjust the fuel / air ratio for reduced emissions
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fuel injection benefits include choke-free starting, steady idling during warm up, excellent fuel economy & reduced emissions
Yamaha Chip Control Throttle (YCC-T)
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YCC-T electronically controls throttle valves for outstanding throttle response & controllability
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YCC-T system provides precise control of intake air volume for a smoother torque curve
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ECU that controls YCC-T is capable of responding to changes at a speed of 1000th of a second
Yamaha D-Mode variable throttle control... 3 modes available
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enables the rider to adjust the performance characteristics of the engine based on riding preferences or riding conditions
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standard mode emphasizes very linear throttle & torque feel of the engine
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A Mode allows the rider to enjoy even sportier engine performance in the low to mid rpms
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B Mode reduces throttle response for riding situations that require softer power characteristics, such as slippery or wet conditions
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D-Mode button is conveniently located on the RHS handle bar switch gear
Traction control system with 2 modes plus off.
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mode 1 provides mid-level intervention (allows some wheel spin)
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mode 2 provides maximum intervention (no wheel spin)
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works in conjunction with the YCC-T system (utilizing same wheel sensors as ABS system)
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system senses when the rear wheel begins to spin & modifies the YCC-T function, ignition timing & fuel injection volume to reduce power & eliminate wheel spin
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status indicator / warning light in meter assembly
Electronic Control Unit (ECU) utilizes a powerful 32-bit processor for fast control of the injection, engine management & ignition processes.
Air box features dual resonator chambers & unequal internal intake funnel lengths for all 3 cylinders.
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benefit is a wide torque curve & exciting intake sound that accentuates the exhaust note
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viscous paper type air filter is used
Compact 6-speed transmission.
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gear ratios are optimized to accentuate the torque & throttle response of the engine
Compact, slipper (back limiter) clutch with assist.
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slipper clutch reduces the negative effects of engine braking on handling & suspension
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reduces rear wheel hop/ chatter when decelerating for improved riding performance & smoother corner entries
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assist function reduces clutch lever effort by up to 20%
Stylish, compact, low mounted, 3 into 1 exhaust system
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stainless steel header pipes with special "Nano-film" coating
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muffler is a triple expansion type with a 3-way honeycomb catalyzer to reduce emissions
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low mounted design centralizes mass for excellent handling & light weight feeling
Flat design radiator for maximum cooling efficiency.
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protector plate on lower edge of rad prevents small stones from hitting the rad & cooling fan
Liquid-cooled oil cooler maintains stable lubricant temperatures for extended engine life.
Convenient spin-on type oil filter & easy access drain plug for fast oil changes.
Convenient oil level sight glass.
Maintenance-free transistor controlled ignition (TCI).
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produces a strong spark for fast starts
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provides precise ignition timing / mapping for optimum engine performance at all rpms
Air Injection System (AIS... not ram air) injects fresh air into exhaust ports to fully burn any unburnt fuel, further reducing exhaust emissions.