From a Yamaha press release on the 2002 YZF-R1:
ALL New for 2002:
Completely new, ultra-sleek bodywork features a sharper front profile and headlight; more compact fuel tank; engine-revealing side cowlings; and restyled seat and ultra-sleek tailsection.
Compact, ultra-lightweight 998cc, DOHC, 20-valve, liquid-cooled, in-line four-cylinder engine features significant intake, exhaust and internal retooling to enhance low- and mid-range torque and boost top-end power!
All-new, competition-bred suction-piston type fuel injection – the first ever such system used on a production motorcycle – features shorter intake ports and a special vacuum-controlled intake system to ensure optimum low-rpm air volume and thus smoother, stronger, more linear power across the rpm range.
EFI’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.
All-new, forward-facing airbox routes cooler, fresher air engine-ward as speeds increase, delivering greater high-rpm output.
All-new, 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 stronger, new-design fastening bolts for greater high-rpm durability.
4-into-2-into-1 exhaust with titanium muffler features reshaped, lighter-weight titanium header pipes for enhanced low- to mid-range torque and top-end power.
All-new, higher-efficiency radiator and ring-style cooling fan produces 20% more airflow.
Yamaha’s patented Exhaust Ultimate Power (EXUP) valve, redesigned with two shafts and dual butterfly valves to be smaller and lighter, adjusts exhaust flow for maximum torque.
Increased oil capacity and larger oil cooler provide 20% better performance, while bigger sightglass ensures easy oil level inspection.
All-new direct ignition coils, iridium spark plugs and higher-output magneto delivers hotter, more reliable firing.
All-new aluminum Deltabox III frame, finished in gorgeous R7-spec black, boasts greater rigidity with reduced weight, a 600cc-class 54.9″ wheelbase, and uses the engine as a fully stressed member for industry-leading handling.
Solid-mounted engine has been raised 20mm inside new frame, centralizing rider/machine mass for quicker cornering transitions.
All-new, fully detachable aluminum subframe means easier rear shock access.
Extra-long (22.9″) swingarm features all-new asymmetrical design to accommodate retooled EXUP valve and muffler, as well as higher pivot axis and slant angle to match repositioned engine mounting.
Redesigned inverted telescopic front fork features 4.7″ of travel and more rigid, larger-diameter 43mm tubes with higher-rate springs and a wider range of damping adjustability for sharper, more responsive cornering performance.
Revised front-end geometry features reduced fork offset and increased trail for more linear response during cornering.
All-new, one-piece hollow forged aluminum clip-ons and a lighter-weight steering shaft pipe deliver enhanced balance and feel.
40mm piggyback rear shock with 5.1″ of travel features higher spring rates, a wider range of full adjustability and a lighter-weight aluminum preload adjuster cam to ensure exceptional rear wheel tracking and handling performance.
Dual 298mm front disc brakes feature new gold-anodized, 4-piston calipers with all-new aluminum pistons and sintered brake pads for stronger, one-finger stopping power.
Rear brake set-up features lighter-weight, smaller-diameter 220mm disc with all-new 2-piston pin-slide-type caliper.
All-new LED taillight is lighter-weight and significantly brighter, while boasting a sleek, single-piece curved design.
All-new speedometer console with newly adjustable LCD illumination features multi-function digital (odometer, dual tripmeters, water temperature) and analog (tachometer) gauges and indicator lights.
Instrumentation also features all-new shift indicator light, adjustable for pre-selected rpm levels to suit different riding styles or roads.
Overall weight reduced thanks to lighter-weight wheels, drive sprocket cover, drive chain and front fender.
Additional Features:
Specially designed, one-piece cylinder and crankcase assembly provides tremendous engine rigidity that’s lighter and stiffer than two-piece designs.
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.
