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Suzuki GSX-R1000 Engine

2003-2004 Factory Service Manual

2003 model:


  • Compact 988cc 4-stroke, 4-cylinder, liquid-cooled engine with gear-driven counterbalancer features new ventilation system to equalize lower-cylinder pressure and reduce mechanical loss.

  • Electronic fuel injection system features the Suzuki Dual Throttle Valve System (SDTV)- maintains optimum air velocity in the intake tract for smooth low-to-mid rpm throttle response and high torque output. Includes Fast Idle System (AFIS).

  • New tapered, double-barrel throttle body design is simpler in design with less weight.

  • New 32-bit ECM with 22-trigger pole rpm sensor, provides more precise control of ignition timing and injector operation for each cylinder.

  • Pulsed-air injection system (PAIR) helps reduce emissions.

  • New internal oil passageways feed hydraulic cam chain tensioner, eliminating external lines and reducing weight.

  • Cylinder head features a narrow 25 included valve angle, creating a compact combustion chamber, high compression ratio and a straight intake tract for high power output.

  • Relocated ram-air intake ducts are 20 mm closer to the center of the fairing increasing ram air pressure, charging efficiency and torque output.

  • Durable SCEM-plated cylinders house new lightweight forged pistons with low-tension rings to reduce friction.

  • Suzuki Exhaust Tuning System (SET) regulates exhaust back pressure in the exhaust system to suit running conditions and maintain optimum engine torque.

  • All new titanium 4-into-2-into-1 exhaust system features larger-volume muffler to improve flow and power without increasing noise level.

  • Large radiator and high-capacity oil cooler provide maximum cooling efficiency.

  • Six-speed transmission with high-capacity 19-plate clutch.


right_front_cutaway.jpg (65344 bytes)

in_bike_chassis.jpg (51693 bytes)


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Engine: 988cc, 4-stroke, four-cylinder, liquid-cooled, DOHC, 16-valve, TSCC

Bore & Stroke: 73.0 x 59.0mm

Compression Ratio: 12.0:1

Carburetor: Fuel Injection

Lubrication: Wet Sump

Ignition: Digital/transistorized

Starter: Electric

Transmission: 6-speed, constant mesh

Final Drive: #525 chain


2001 model:

The photos of the engine on the right were provided by Tim Smith.

The matrix immediately behind the engine is a one inch by one inch grid. The larger images are provide for dimensioning.

2001_front_half.jpg (74399 bytes)
even larger

2001_left_side_half.jpg (65951 bytes)
even larger

2001_rear_half.jpg (82724 bytes)
even larger

2001_right_side_half.jpg (69307 bytes)
even larger

Revised: December 14, 2004.

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