1971–1977 Honda XL250 / XL350 Workshop Manual

Built around Honda's original XL250 shop instructions and expanded with XL350 differences, this 100-page PDF covers the XL250, XL250 K1, K2, and K3 plus the XL350, K1, K2, and K3 configurations represented from November 1971 base production through the 1977 supplement. Its mix of owner-service items and maintenance marked for an authorized Honda dealer unless the owner has the proper tools and mechanical proficiency makes it best suited to professional mechanics and experienced owners equipped for measurement-heavy engine and chassis work.

• Engine repair coverage includes engine removal and post-installation adjustments, cylinder-head and rocker-arm disassembly, valve-guide replacement and seat inspection, camshaft and valve-timing work, cam-chain service, cylinder and piston inspection, and crankshaft and connecting-rod checks.

• Lubrication and drivetrain procedures trace the pressure-fed oil circuit and cover the screen and centrifugal filters, trochoid oil pump, wet multi-disc clutch, primary kick-starter mechanism, transmission, shift drum, forks, breather, and carburetor inspection and adjustment.

• Chassis repair sections address front and rear wheel service, drum-brake inspection and adjustment, steering-head bearings, telescopic-fork disassembly and seal replacement, rear-shock service with the specified spring tool, swingarm inspection, and drive-chain adjustment.

• Electrical diagnosis covers the 6V magneto ignition and charging systems, ignition-coil performance testing, contact-point and timing adjustment, generator output checks, rectifier and regulator tests, battery service, and continuity checks for the lighting, brake, horn, neutral, and engine-stop circuits.

• Troubleshooting charts connect symptoms and probable causes for no-start conditions, unstable idle, power loss, clutch and shifting faults, overheating, poor braking, suspension or wheel problems, and charging-system or battery failures.

• Factory reference data includes model-specific torque tables, clearances, capacities, wear limits, carburetor settings, electrical test values, maintenance schedules, and a dedicated special-tool catalog. Listed examples include valve spring compressor 07957-3290000, valve guide remover 07942-3290100, rear cushion service tool 07959-3290000, front fork seal driver 07947-3290000, and drive-chain connector/disconnector 07975-3000001.

Model-Specific Coverage

The main procedures are based on the XL250, with XL350 changes supplied separately to avoid repeating common repair instructions. The preface identifies the initial frame numbers as XL250-1000001 and later, XL250 K1-2000001 and later, and XL350-1000001 and later. The XL350 modified-points chapter explains its air-cut carburetor valve, connecting-rod big-end bearing selection, engine and chassis differences, and the cutting, press-fitting, and staking procedures required for the endless drive chain used on the XL250 K1 and XL350.

A dedicated XL250 K2 / XL350 K1 supplement documents revised fuel-cock markings, handlebar switch arrangements, the shock-absorbing side stand, updated maintenance requirements, and separate model wiring diagrams.

The XL250 K3 / XL350 K2 1976 supplement applies from XL250 engine and frame numbers XL250E-4000001 / XL250-4000001 and XL350 numbers XL350E-3000001 / XL350-3000001. It covers the three-piece oil-control ring, tachometer-shaft oil orifice, revised kick-starter spindle and idle gear, XL250 K3 crankshaft-bearing change, carburetor settings, suspension updates, exhaust and spark-arrestor service, cable routing, and the combined K3/K2 wiring diagram.

For the 1977 XL350 K3, coverage begins with engine XL350E-3100001 and frame XL350-3100001. That supplement adds fuel-filter service, revised rocker-arm shaft installation, carburetor disassembly and adjustment, and an updated maintenance schedule.

Diagrams, Specifications, and Repair Cautions

Representative visuals include the lubricating oil circuit, primary kick-starter mechanism, ignition-system schematic, charging-system schematic, and model-specific wiring diagrams for the XL250, XL250 K1, general-version XL350, XL250 K2, XL350 K1, and combined XL250 K3/XL350 K2 electrical systems. Exploded assembly views support the engine, carburetor, wheels, brakes, fork, rear suspension, and exhaust repair sections.

One critical transmission warning concerns the countershaft oil seal: its locating lug must engage the crankcase groove so the oil-feed passage remains open; incorrect installation can starve and bind the countershaft and gears. The electrical section also warns that reversed battery polarity or high-speed generator operation with the rectifier circuit disconnected can damage the silicon rectifier and wiring.

These motorcycles are air-cooled, so the manual contains no coolant-system chapter. Brake, fuel-system, battery-charging, and spark-arrestor work carries specific hazards; follow Honda's precautions concerning contaminated brake linings, flammable fuel or solvent, charging gases, and hot exhaust components.