Here are some stats...
The Yamaha's Engine:
Compact, ultra-lightweight 998cc, DOHC, 20-valve, liquid-cooled, in-line four-cylinder
engine produces significant low- and mid-range torque and top-end power!
Competition-bred suction-piston fuel injection, with 40mm throttle bodies, features short
intake ports and a special vacuum-controlled intake system to ensure optimum low-rpm air
volume and thus smooth, strong, linear power across the rpm range.
The fuel injection's lightweight Electronic Control Unit (ECU) adjusts injection period
and timing via intake air temperature/pressure, atmospheric pressure, coolant temperature,
crankshaft position, and rpm and throttle position sensors.
Forward-facing airbox routes cooler, fresher air toward the engine as speeds increase,
delivering greater high-rpm output.
Specially designed, one-piece cylinder and crankcase assembly provides tremendous engine
rigidity that's lighter and stiffer than two-piece designs.
Higher silicon-content cylinder sleeves ensure greater heat dissipation (and reduced oil
consumption) for consistent power delivery and reduced frictional power loss.
Lightweight forged pistons feature carburized connecting rods with strong fastening bolts
for great high-rpm durability.
4-into-2-into-1 exhaust with titanium muffler features titanium header pipes for enhanced
low- to mid-range torque and top-end power.
High-efficiency radiator and ring-style cooling fan produces more airflow than conventional
designs.
Yamaha's patented Exhaust Ultimate Power (EXUP) valve, designed with two shafts and dual
butterfly valves to be small and light in weight, adjusts exhaust flow for maximum torque.
Special 3-axis gearbox design stacks input/output shafts to create a low center of gravity
and keep overall engine size to 600cc-spec dimensions.
Close-ratio 6-speed transmission delivers seamless power transfer between gears for maximum
acceleration.
Compact, large-capacity clutch ensures consistent, positive engagement.
Competition spec gear shift lever and linkage rod combine with specially treated,
smooth-surfaced shift cam for slick shifting.
Large oil cooler provides high performance, while sightglass ensures easy oil level
inspection. Direct ignition coils, iridium spark plugs and high-output magneto deliver reliable firing.
