Honda CF50/CF70 Chaly Shop Manual (1970s)

This Honda shop manual covers engine, frame, and electrical service for the CF50 and CF70 Chaly.

Page Bookmarks and Wiring Diagram Readability

Finding your way around: Each page has a numbered bookmark. PDF text search is unavailable. Zoom in on the sideways wiring diagram to read the small wire-color codes and switch labels.

The ZIP contains one printable, 57-page PDF in English, including the front cover and the combined preface and contents page.

Engine Tear-Down, Chassis Service, and Electrical Tests

Here are selected topics from the manual. Other examples include drive chain adjustment and fuel strainer inspection.

• Engine and cylinder head: Step-by-step engine removal and installation, cylinder and piston disassembly, valve guide replacement, and valve timing adjustment.

• Clutch, oil pump, and transmission: Wet-clutch disassembly, oil pump rotor inspection, crankcase separation, shift fork checks, and kick starter spindle removal.

• Carburetor service: Removal and disassembly, main jet and float valve inspection, float height and idle adjustment, and throttle and choke cable setup.

• Wheels, brakes, and suspension: Front and rear hub and drum brake service, telescopic fork disassembly, steering bearing inspection, and rear shock service.

• Electrical diagnosis: Charging output, ignition coil and condenser tests, switch continuity checks, and a shared CF50/CF70 wiring diagram.

Honda wrote the manual for mechanics and marks certain maintenance tasks for an authorized dealer unless the owner has the proper tools and mechanical skills.

Top-End and Transmission Repair

The on-frame service chart helps you decide whether a job calls for engine removal. It lists cylinder head, piston, clutch, and oil pump work that can be done with the engine installed.

Top-end inspection covers valve seat contact, rocker arm wear, cylinder bore condition, and piston ring wear. Honda warns that the cooling fins can be damaged during cylinder removal and that careless ring handling can score the piston.

The crankshaft and transmission section covers connecting rod play, gear dog wear, and gear movement on the shaft splines. The mainshaft and countershaft exploded view (Fig. 3-49) shows the gear, washer, and retaining ring arrangement. For engine and frame reassembly, Honda uses the disassembly sequences in reverse, supplemented by component-specific assembly notes.

Carburetor Settings and Model Differences

The setting table distinguishes the CF50’s 275A carburetor from the CF70’s 277A and lists the main jet for each. The carburetor exploded view (Fig. 3-51) identifies the float, float valve, main jet, and gasket set.

Wheel, Fork, and Rear Suspension Work

The wheel sections cover bearing looseness, rim runout, brake lining thickness, drum-to-lining clearance, and final driven sprocket wear. The front fork and shock absorber exploded view (Fig. 4-13) identifies the steering races, steel balls, guides, and seals. Rear suspension work includes swingarm removal, rubber bushing inspection, and shock spring disassembly.

Magneto Ignition and Charging Diagnosis

The ignition section covers contact breaker point gap, ignition timing, spark plug gap, and model-specific NGK and DENSO plug applications. The charging test circuit (Fig. 5-2) provides separate daytime and nighttime load checks. Honda also covers silicon rectifier testing and battery state of charge.

Harness routing notes complement the wiring diagram. Continuity checks cover the main, brake light, dimmer, turn signal, and neutral switches. Troubleshooting tables organize possible causes and remedies for no-starts, erratic running, clutch slip or drag, shifting faults, poor braking, and lighting or horn problems.

Maintenance Schedule, Torque Tables, and Special Tools

Factory reference tables include engine and frame tightening torques, lubrication and capacity data, cold valve clearances, and service limits. The maintenance schedule lists both time and mileage intervals.

The tool list identifies the flywheel puller (07933-0010000) and rear shock absorber compressor (07959-3290000). It specifies valve seat cutters for the CF50 and a valve seat grinder for the CF70.

Fuel and ignition work can pose fire and shock hazards. Review Honda’s service precautions before starting.

Oil Pump and Gear Wear Limits at a Glance

For both models, the oil pump body-to-outer-rotor clearance is 0.1–0.15 mm at assembly, with a 0.2 mm service limit. Rotor-to-pump-cover clearance has a separate assembly range of 0.02–0.07 mm and a 0.12 mm service limit.

The transmission table gives an assembly range of 0.08–0.17 mm for gear backlash and a 0.2 mm service limit.