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.
-
4-valve, downdraft style combustion chamber
-
excellent torque output... especially in the low to mid rpm range
-
4-valve design maximizes flow into & out of combustion chamber
-
31 mm intake & 25 mm exhaust valves
-
valve angle is 26.5 degrees to keep combustion chamber compact
-
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.
-
design reduces inertia torque while emphasizing linear torque in response to the rider's throttle action
-
design has been optimized to achieve strong torque over a broad rpm range
-
fast, linear throttle response
-
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.
-
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
-
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.
-
design aids in fast engine response
-
reduces mechanical vibration
-
excellent durability
Direct ceramic composite plated cylinder uses "liner less" bores.
-
ceramic coating sprayed directly on the aluminum block, eliminating the liner & reducing weight
-
excellent heat dissipation for consistent power delivery
-
coating enhances the thin film of oil between the cylinder & piston, reducing friction & increasing power
Offset cylinder design.
-
cylinder is "offset" relative to the crank (toward exhaust side)
-
reduces frictional losses between the pistons and the cylinder wall during the power stroke for improved power output
One-piece cylinder and upper crankcase assembly.
-
superior engine & chassis rigidity (engine is a stressed member)
-
reduces weight
Lightweight hollow camshafts.
-
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.
-
creates a more compact & shorter engine front to back
-
shorter engine allows for optimum engine placement in the "sweet spot" of frame for desired weight distribution & great handling
Closed loop Mikuni, 41mm, throttle body fuel injection system.
-
system uses throttle position sensor (TPS) & acceleration position sensor (APS)
-
injectors feature 12 holes & 20 degree spray pattern
-
injectors spray fuel directly at the intake valve
-
"closed loop system" uses an oxygen sensor to "sniff" spent exhaust & automatically adjust the fuel / air ratio for reduced emissions
-
fuel injection benefits include choke-free starting, steady idling during warm up, excellent fuel economy & reduced emissions
Yamaha Chip Control Throttle (YCC-T).
-
YCC-T electronically controls throttle valves for outstanding throttle response & controllability
-
YCC-T system provides precise control of intake air volume for a smoother torque curve
-
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.
-
enables the rider to adjust the performance characteristics of the engine based on riding preferences or riding conditions
-
standard mode emphasizes very linear throttle & torque feel of the engine
-
A mode allows the rider to enjoy even sportier engine performance in the low to mid rpms
-
B Mode reduces throttle response for riding situations that require softer power characteristics, such as slippery or wet conditions
-
D-Mode button is conveniently located on the RHS handle bar switch gear
Traction control system with 2 modes plus off.
-
mode 1 provides mid-level intervention (allows some wheel spin)
-
mode 2 provides maximum intervention (no wheel spin)
-
works in conjunction with the YCC-T system (utilizing same wheel sensors as ABS system)
-
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
-
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.
-
benefit is a wide torque curve & exciting intake sound that accentuates the exhaust note
-
viscous paper type air filter is used
Compact 6-speed transmission.
-
gear ratios are optimized to accentuate the torque & throttle response of the engine
-
accessory plug & play quick shifter
Compact, slipper (back limiter) clutch with assist.
-
slipper clutch reduces the negative effects of engine braking on handling & suspension
-
reduces rear wheel hop/ chatter when decelerating for improved riding performance & smoother corner entries
-
assist function reduces clutch lever effort by up to 20%
Accessory quick shifter ready.
-
allows for faster upshifts by eliminating the need to close the throttle or pull in the clutch
-
works with standard shift pattern
-
reduces wear & tear on the clutch & transmission
-
easy plug-and-play installation (part number: BS2-E81A0-V0-00)
Revised, compact, low mounted, 3 into 1 exhaust system.
-
stainless steel header pipes with special "Nano-film" coating
-
muffler is a triple expansion type with a 3-way honeycomb catalyzer to reduce emissions
-
low mounted design centralizes mass for excellent handling & light weight feeling
-
revised muffler cover & end cap for improved appearance
Flat design radiator with new side scoops.
-
protector plate on lower edge of rad prevents small stones from hitting the rad & cooling fan
-
new side scoops direct air into rad plus adds a styling protector plate on lower edge of rad prevents small stones from hitting the rad & cooling fan
Wet sump lubrication system with liquid-cooled oil cooler & easy access drain plug & oil filter.
-
liquid-cooled oil cooler maintains stable lubricant temperatures for extended engine life
-
easy access spin-on type oil filter & drain plug for fast oil changes
Maintenance-free transistor controlled ignition (TCI).
-
produces a strong spark for fast starts
-
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, reducing exhaust emissions.