Suzuki LT-Z250 QuadSport 250 ATV Service Manual, 2004–2009 (P/N 99500-42175-03E)

This Suzuki factory service manual (P/N 99500-42175-03E) covers the 2004–2009 LT-Z250 QuadSport 250 ATV. It uses the LT-Z250K4 as the basis for the main repair chapters and includes model-year updates for the K5 through K9.

PDF Bookmarks, Search, and Wiring Detail

Finding service information: Embedded bookmarks link to the main chapters and model-year supplements. Most text is searchable, with limited text search on the K9 chapter opener. Zoom in to read the small wire-color codes and switch markings on the main wiring diagram.

The download is one printable English-language PDF with 323 pages, including four unnumbered introductory pages and six blank pages. The five model-year supplements are included as chapters in the same file.

Engine Overhaul, Rear Drive, and Electrical Diagnosis

Selected coverage is outlined below. The manual also includes headlight beam adjustment and rear brake cam lever setup.

• Periodic maintenance: A service schedule is paired with tune-up procedures, cold valve clearance adjustment, and engine compression and oil pressure checks.
• Engine repair: Step-by-step procedures cover engine removal, disassembly, and reassembly, with inspections for the cylinder head, valves, camshaft, cam chain, piston, and crankshaft.
• Clutch, transmission, and rear drive: Covers centrifugal-clutch checks, transmission overhaul, shift fork and reverse mechanism inspection, and backlash, shim selection, and tooth contact for the bevel gears.
• Fuel and lubrication: Covers carburetor removal, cleaning, inspection, and reassembly, along with fuel valve inspection and service of the oil pump, filter, and strainer.
• Brakes, steering, and suspension: Covers front caliper and master cylinder overhaul, brake bleeding, rear drum brake service, toe-in adjustment, and swingarm and rear axle service.
• Electrical diagnosis: Includes charging, starter, and CDI ignition troubleshooting, component tests, the main wiring diagram, and wiring harness routing.

Suzuki wrote this manual for experienced mechanics with the service skills and workshop equipment required for the job, including the specified special tools.

What Changes from K4 to K9

K5 and K6: The K5 supplement adds revised service data, chassis torque specifications, a thread-lock instruction for the front caliper mounting bolts, and a front brake hose routing drawing that compares K4 and K5. K6 updates the specifications and service data.

K7 through K9: K7 and K8 carry forward the K6 specifications and service data, with changes to information labels. The K9 chapter documents revised fuel tank construction and pilot screw service for Canadian and U.S. models. Its carburetor table groups Canada with the U.S., a change from the earlier tables. The supplements refer back to preceding chapters for procedures they carry forward.

Shop References and Fault Finding

The charging-system troubleshooting chart helps narrow a battery drain complaint by distinguishing current leakage from a charging fault. The starter and ignition charts address no-crank and weak or absent spark. The engine lubrication circuit and flow chart show oil paths through the engine, and the rear drive drawings show where the bevel gear shims fit. Exploded views pair assembly details with tightening and lubrication notes.

Service tables give piston-to-cylinder clearance, connecting rod deflection limits, and separate tightening torques for the engine, drivetrain, and chassis. The tool directory identifies the crankcase separator (09920-13120), crankshaft installer (09910-32812), clutch sleeve hub holder (09920-53730), bearing installer set (09913-70210), and multi-circuit tester set (09900-25008).

Oil Filter, Carburetor, and Rear Shock Cautions

Incorrect oil filter orientation can cause serious engine damage. The carburetor chapter also warns that compressed air can damage the diaphragm if it is still installed.

Suzuki treats the nitrogen-charged rear shock as a sealed replacement unit. The manual covers removal, inspection, spring preload adjustment, installation, and disposal. Brake, fuel, tire, battery, rotating-driveline, and pressurized shock work should be carried out with the specified equipment and factory safety precautions.

Sample Valve Clearance and Clutch Test Values

For the K4, the maintenance chapter gives cold valve clearances of 0.03–0.08 mm at the intake and 0.08–0.13 mm at the exhaust, measured at top dead center on the compression stroke.

The K4 centrifugal clutch section lists a lock-up range of 3,100–3,700 r/min for the warm-engine, fifth-gear load test used to check for clutch slip.