Honda XL175 Shop Manual 1973–1978 (P/N 6136201)

This is Honda’s factory shop manual for the XL175 (P/N 6136201). Honda based the procedures, illustrations, and specifications in this edition on the 1973 model.

PDF Format and Navigation

Finding procedures and reading diagrams. The printed contents page lists the sections. The PDF has no text search or embedded bookmarks. Small wire color codes and terminal labels in the full wiring diagram are readable when zoomed in.

The ZIP download contains one printable PDF with 76 pages. The total includes the front and back covers, a combined preface and contents page, one unnumbered blank page, and the final numbered memo page.

Engine Service, Chassis Repair, and Electrical Tests

These selected workshop topics show the range of procedures. The manual also covers cleaning the foam air filter and servicing the fuel valve screen.

• Maintenance and adjustment: Covers tappet clearance, breaker-point gap and ignition timing, carburetor idle and air-screw settings, throttle and clutch free play, and cam-chain tension.

• Engine service: Separates on-frame jobs from engine removal and installation, with procedures for the cylinder head, camshaft, cylinder, piston, oil pump, and centrifugal oil filter.

• Clutch, kick starter, and transmission: Covers wet multi-plate clutch and kick-starter disassembly, mainshaft and countershaft service, and inspection of the gearshift mechanism.

• Wheels, brakes, and suspension: Covers the spoked wheels and drum brakes, steering stem and ball races, telescopic forks, rear shocks, swingarm, and frame strip-down.

• Electrical diagnosis: Pairs ignition and charging schematics with tests for the ignition coil, AC generator, silicon diode rectifier, regulator, battery, and lighting and control switches.

• Factory service data: Includes the maintenance schedule, torque tables, engine and frame service limits, carburetor settings, electrical test specifications, troubleshooting charts, and a full-page wiring diagram.

Honda wrote the manual for mechanics who service the XL175, and the maintenance schedule distinguishes basic owner maintenance from jobs that call for mechanical proficiency and the proper tools.

Engine, Carburetor, and Transmission Repair

Top-end inspection. Honda shows how to check valve-seat contact, measure valve stem-to-guide clearance, and check the cylinder bore for taper and out-of-round. The cylinder-head exploded view identifies the valve guides and spring seats used from engine serial XL175E-2008517 onward.

The valve-timing illustration shows the cam-sprocket alignment marks. Honda cautions against letting the cam chain or sprocket bolts fall into the crankcase during top-end work.

Lubrication and lower end. An oil-circulation diagram and cutaway trace flow through the engine. The procedures cover oil screen service, trochoid pump rotor clearances, clutch plate and spring inspection, kick-starter ratchet checks, crankcase oil passages, and crankshaft bearing and connecting-rod play.

Gearshift and reassembly. The gearshift section separates on-frame spindle and stopper work from bench service of the shift drum and forks. The transmission exploded view and reassembly illustrations show bearing and set-ring placement, while the inspection procedures cover gear dogs and backlash. Honda generally uses the reverse of the disassembly sequence and gives separate notes for critical reassembly points.

Carburetor. The single-carburetor chapter covers jet and float-valve inspection, with a setting table for standard and optional main and slow jets, needle position, and float height.

Wheel, Brake, and Suspension Service

Wheel and brake inspection covers axle bend, rim runout, bearing play, lining wear, and drum condition. Routine service also covers brake free play, drive-chain adjustment and lubrication, and fork-oil changes. Support the motorcycle securely before engine, wheel, fork, or steering work, and keep grease and oil off the brake linings.

The front-fork assembly view shows the seal and spring layout. Rear-shock spring service calls for a compressor, and swingarm inspection includes pivot collar-to-bushing clearance. The frame and handlebar sections show harness and cable routing.

Ignition, Charging, and Switch Diagnosis

The charging test circuit and separate daytime and nighttime output checks help narrow a low-charge fault to the generator, battery, or rectifier. Honda gives stator continuity and insulation tests, rectifier diode checks, regulator testing, and battery inspection.

Ignition diagnosis covers coil continuity and spark output, along with checks for the condenser, contact breaker, spark advancer, and spark plug. Switch continuity tables and the full wiring diagram cover lighting, ignition, charging, turn signals, the horn, stop lights, and the neutral indicator. Routine adjustments include headlight aim and stop-light switch operation.

Honda warns that a high-voltage megger can damage the rectifier diodes and that reversing battery polarity can damage the diodes or wiring harness.

Factory Illustrations and Special Tools

The manual contains 176 numbered figures. The tool table identifies the XL175 special-tool set (07900-3620000), rotor puller (07933-2000000), valve spring compressor (07957-3290000), fork seal driver (07947-3550000), and rear shock absorber compressor (07959-3290000), along with steering-race, bearing, valve-guide, tappet, and locknut tools.

A Look at Tappet Settings and Wear Limits

For the cold XL175 engine at top dead center on the compression stroke, Honda specifies 0.05 mm (0.002 in.) intake and 0.08 mm (0.003 in.) exhaust tappet clearance.

The top, second, and oil rings share a standard end gap of 0.2–0.4 mm (0.0079–0.0157 in.) and a service limit of 0.75 mm (0.0295 in.). The clutch friction discs have a standard thickness of 2.92–3.08 mm (0.1150–0.1213 in.) and a service limit of 2.6 mm (0.1024 in.).