Engine -
Lightweight, compact, 320 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..
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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
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The YZF-R3 uses regular 87 octane gas.
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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
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Valve adjustment interval is every 42,000 km.
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Automatic cam chain tensioner.
- reduces mechanical engine noise & maintenance
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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
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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
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180-degree crankshaft with uneven firing order.
- helps reduce "pumping losses" for maximum power output
- provides an interesting exhaust note
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Gear driven "primary coupled-force" balancer shaft.
- reduces engine vibration for excellent rider comfort
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Lightweight forged aluminum pistons.
- provide fast engine response
- reduce weight
- reduce mechanical vibration for excellent durability
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Carburized connecting rods (carburizing is a form heat treating).
- excellent strength & durability
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"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
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Airbox utilizes a viscous paper-type air filter.
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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
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Compact, wet-type, multi-plate clutch.
- ensures consistent, positive shifting
- light, easy clutch lever pull.
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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
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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
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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
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Air Induction System (AIS... not ram air).
- reduces harmful exhaust emissions
- injects fresh air into exhaust ports to fully burn any unburnt fuel, further reducing exhaust emissions
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