2001–2008 Suzuki GSX1400 Service Manual (P/N 99500-39222-01E)

• The service manual covers Suzuki GSX1400K2, K3, K4, and K5/UDK5 (2002–2005 model years), with a separate K2/K3 parts catalog.
• Engine procedures cover removal, cylinder-head overhaul, camshaft timing, and internal clutch and transmission repair.
• Fuel-injection troubleshooting includes malfunction-code diagnosis, fuel-pressure and pump-delivery testing, throttle-body service, and throttle-valve synchronization.
• SACS coverage addresses oil-cooler removal, cooling-fan motor checks, and thermo-switch testing, supported by the Cylinder Head Oil Cooling Circuit and Engine Lubrication System Chart.
• Chassis procedures address fork-seal replacement, steering and swingarm bearings, brake-caliper and master-cylinder repair, and hydraulic-clutch service and bleeding.
• Electrical diagnosis covers charging, starter, ignition, and side-stand interlock faults, with generator and regulator/rectifier tests, ignition peak-voltage checks, wiring diagrams, and harness routing.

Technical Documentation Scope

This set contains 501 pages across two PDFs: a 400-page Suzuki factory service manual, P/N 99500-39222-01E (second edition, copyright 2001), and a 101-page parts catalog, code 9900B-30142-010 (second edition, June 2002).

The service manual addresses the 1402 cm³ air-cooled DOHC four-cylinder engine with SACS, a wet multi-plate clutch, and a six-speed constant-mesh transmission. Suzuki wrote it for users who already have motorcycle-servicing knowledge, practical skills, and the appropriate equipment, including special tools.

Engine and Chassis Repair

The engine chapter distinguishes in-frame work from jobs requiring engine removal. It covers valve-guide replacement and seat reconditioning, color-coded crankshaft and connecting-rod bearing selection, and crankshaft thrust-clearance adjustment. Clutch procedures include the back-torque limiter; balancer timing and the Transmission Parts Location drawing support drivetrain assembly.

Uneven camshaft-holder tightening can damage the cylinder head or holder thrust surfaces—a specific caution in the assembly instructions.

Rear shock absorbers are treated as nonserviceable units: inspection, replacement, and adjustment are covered, not internal rebuilding.

FI Diagnosis and Throttle-Body Adjustment

For the returnless injection system, the manual explains Dealer Mode code retrieval with Suzuki mode selection switch 09930-82710. User Mode displays and fail-safe operation accompany circuit tests for injectors, throttle-position (TP) and secondary-throttle-position (STP) sensors, and the secondary-throttle actuator. The FI System Wiring Diagram supports ECM circuit tracing.

Fast-idle adjustment and vacuum-gauge calibration are covered alongside synchronization with vacuum balancer gauge 09913-13121. The throttle-body cautions address damage to the valves and bodies when the valves snap shut with the cables disconnected.

Model-Year-Specific Updates

The supplements work with the base chapters rather than replacing them. K3 documents the change from ball-type to tapered-roller steering bearings and the revised gearshift-cam stopper-plate bolt specification. K4 supplies its periodic-maintenance chart and wiring diagram.

K5/UDK5 adds immobilizer operation and indicator interpretation, exhaust-pipe/muffler and center-stand installation, and revised harness routing. Immobilizer coverage explains operation, not key-programming procedures.

K2/K3 Parts Identification

The parts catalog covers standard K2/K3 models for E2 (UK), E19 (EU), and E24 (Australia), plus GSX1400U1K2 and GSX1400U1K3 for E19. OEM part numbers, quantities, color codes, and supersession notes accompany exploded views and a part-number index.

Separate Throttle Body (Model K2) and Throttle Body (Model K3) illustrations distinguish those assemblies. The E24 turn-signal pages separate machines through frame No. 100196 from those beginning at frame No. 100197. The catalog supports parts identification; assembly procedures belong to the service manual.

Specification Highlights

Reference data includes intake and exhaust valve clearances, tappet-shim selection charts, compression and oil-pressure test specifications, and component wear limits. Chassis tables provide cold tire pressures for solo and passenger loads and component-specific tightening torques. Fluid specifications distinguish oil changes, filter changes, and overhaul fills. Cylinder-head tightening sequences and electrical test values accompany the relevant procedures.

Brake and steering repairs require the factory tightening specifications and functional checks before the motorcycle is returned to service.