2021 Yamaha YZF-R3

- Lightweight, compact, 321 cc, liquid-cooled, DOHC, 8-valve (4-valves/cyl), fuel injected, inline-twin cylinder engine. The engine has been designed to provide solid performance right across the rev range, with very linear throttle response, low vibration & excellent fuel economy.

- Downdraft style, compact combustion chamber

- The YZF-R3 uses regular 87 octane gas.

- Valves are 26 mm (intake) and 22.5 mm (exhaust) in diameter.

- Valve adjustment interval is every 42,000 km.

- Automatic cam chain tensioner.

Features & Benefits

• Engine

•  Lightweight, compact, 321 cc, liquid-cooled, DOHC, 8-valve (4-valves/cyl), fuel injected, inline-twin cylinder engine. The engine has been designed to provide solid performance right across the rev range, with very linear throttle response, low vibration & excellent fuel economy.
• Downdraft style, compact combustion chamber
  • 4 valves per cylinder to enhance low-to mid-range torque
  • straight intake path into the combustion chamber for excellent power output
• The YZF-R3 uses regular 87 octane gas.
• Valves are 26 mm (intake) and 22.5 mm (exhaust) in diameter.
  • Isonite surface treatment on the valve stems for improved durability & wear resistance
  • valves feature carbon cutters on the valve stems to help reduce carbon build-up during slower speed operation
• Valve adjustment interval is every 42,000 km.
• Automatic cam chain tensioner.
  • reduces mechanical engine noise & maintenance
• Lightweight, all aluminum DiASil cylinder (die cast all aluminum cylinder with silicone content).
  • offers outstanding cooling performance / heat dissipation for consistent power delivery
  • reduces weight since there are no heavy liners & cylinder is made completely of aluminum
• Offset cylinder design.
  • cylinder is offset 7 mm relative to the crankshaft (to the exhaust side)
  • reduces frictional losses between the pistons & cylinder wall during the power stroke
  • improved power output & improved fuel economy
• 180-degree crankshaft with uneven firing order.
  • helps reduce "pumping losses" for maximum power output
  • provides an interesting exhaust note
• Gear driven "primary coupled-force" balancer shaft.
  • reduces engine vibration for excellent rider comfort
• Lightweight forged aluminum pistons.
  • provide fast engine response
  • reduce weight
  • reduce mechanical vibration for excellent durability
• Carburized connecting rods (carburizing is a form heat treating).
  • excellent strength & durability
• "Closed loop" 32 mm throttle body fuel injection system.
  • system uses an idle speed controller (ISC) to maintain a steady idle regardless of engine temperature
  • 12-hole injectors for optimum fuel atomization
  • system is tuned to provide excellent rideability and linear throttle control.
  • close-loop system uses an oxygen sensor to "sniff" spent exhaust & automatically adjust the fuel / air ratio for reduced emissions
• Airbox utilizes a viscous paper-type air filter.
• Compact, 6-speed transmission.
  • ratios specially designed to suit the character (torque & power) of the engine
  • 5th & 6th gears are overdrive gears to reduce engine rpm at highway speeds
• Compact, wet-type, multi-plate clutch.
  • ensures consistent, positive shifting
  • light, easy clutch lever pull.
• Low-mounted, 2-into-1 exhaust system.
  • utilizes a short design muffler fitted with a 3-way catalyzer to reduce exhaust emissions
  • low mounted design centralizes mass for agile handling & lightweight feeling
• Maintenance-free transistor controlled ignition (TCI).
  • produces a strong spark for fast starts
  • provides precise ignition timing / mapping for optimum engine performance at any rpm
• Easy access spin-on type oil filter & engine oil drain plug.
  • fast & easy oil changes
  • oil change interval is 5,000 kms after the initial 1,000 km break-in oil change
• Air Induction System (AIS... not ram air).
  • reduces harmful exhaust emissions