1988–1992 Suzuki LT250R OEM Service & Repair Manual (P/N 99500-22066-01E)

• Model coverage: Built around the LT250RH baseline, with dedicated update sections for LT250RJ (1988), LT250RK (1989), LT250RL (1990), LT250RM (1991), and LT250RN (1992). The annual sections identify changed parts, settings, routing, and service data rather than repeat the core procedures.
• Engine repair: Runs from engine removal through final reassembly, including crankcase separation, piston and cylinder inspection, crankshaft and connecting-rod checks, clutch and six-speed transmission service, kickstarter and gearshift mechanisms, magneto/stator work, reed valve, and exhaust-valve actuator and governor components.
• Fuel, cooling, and electrical systems: Details Mikuni TM34SS carburetor teardown and setup, radiator pressure testing, water-pump overhaul, ignition and lighting output tests, CDI/magneto checks, switch continuity inspection, and system-specific wiring diagrams.
• Chassis procedures: Covers wheel-hub bearings and seals, tire replacement, hydraulic brake overhaul and bleeding, steering and toe-in adjustment, rear axle housing service, front suspension and steering work, and swingarm/rear-suspension inspection, reassembly, and adjustment.
• Diagnostics and reference material: Provides complaint/cause/remedy charts, full wiring and cable/hose routing diagrams, special-tool part numbers, tightening-torque tables, inspection limits, capacities, carburetor data, electrical test specifications, and suspension setup information.
• Document identity: Official Suzuki Motor Corporation publication P/N 99500-22066-01E, supplied as a 249-page PDF. The imprint identifies this copy as the sixth edition, February 1992, with the first edition dated March 1987.

Model-Year Structure and Coverage

Sections 1-8 contain the main repair manual. The 1988 J-model section tells the reader to use those chapters for procedures not repeated in the supplement, then documents the physical changes from the H model. Those changes include the cylinder-head combustion chamber, piston, cylinder port shape and timing, reed valve, air-cleaner outlet tube, crankshaft, carburetor and intake pipe, plus revised harness and hose routing. That layout helps identify which engine and intake components belong to a particular build before repair parts or settings are selected.

Later supplements are more selective. The RK section is primarily updated service data, the RL section adds specifications and service data, and the RM section adds revised torque information, rear-suspension reassembly data, and carburetor air-vent routing. For U.S.-market 1991 machines, the carburetor table is split at frame number 100434/100435, with different jetting and needle-jet data on either side of the break. The RN section supplies the 1992 service data rather than duplicating the core repair chapters.

Repair Procedures and Visual References

The core engine chapter covers the 246 cc water-cooled two-stroke in detail. It begins with assemblies that can be removed while the engine remains in the frame, then moves through engine removal, complete disassembly, component inspection, and factory reassembly. Coverage includes bearings and oil seals, piston/ring/cylinder wear checks, cylinder-head distortion, exhaust-valve inspection and operating checks, reed-valve clearance, crankshaft runout, clutch plates and springs, transmission shafts and shift forks, balancer and primary-drive alignment, and kickstarter assembly.

The carburetor chapter separately explains the slow, main, starter, and float circuits before covering removal, disassembly, needle-valve inspection, float-height adjustment, and remounting. Chassis repair coverage is equally hands-on: front and rear calipers and master cylinders, parking brake, hub bearings, rear sprocket, rear axle shaft and housing, front wishbones and steering shaft, swingarm, cushion linkage, and shock absorber.

Representative graphics include the crankshaft and transmission exploded assemblies, carburetor circuit section views, ignition-system and complete wiring diagrams, front and rear suspension reassembly charts, and wire/cable/hose routing views.

Diagnostics, Special Tools, and Service Notes

The service-information section groups troubleshooting by engine, clutch/transmission, carburetor, radiator, electrical system, handling, suspension, wheels, and brakes. It also lists factory tools by part number. Examples include crankshaft installer 09910-32812, piston pin puller 09910-34510, crankcase separating tool 09920-13120, clutch sleeve hub holder 09920-53710, rotor holder 09930-40113, and rear axle nut holder/remover 09940-92410.

Two manual-specific repair cautions are worth noting. The water-pump impeller bolt uses a left-hand thread, so treating it as a conventional fastener can damage the bolt or pump shaft. During engine reassembly, Suzuki warns against hammering the crankshaft into the crankcase; the specified installer and spacer are used to protect crankshaft alignment.

Brake hydraulic work, hot cooling-system service, and chassis support should be handled with the correct equipment and the safety cautions printed in the manual.