Honda C70 Passport, CL70, C70M & Cub Manual Set 1970–1984 (P/N 6117401)

The CL70/C70/C70M supplement refers back to the included 50/65 base sections for fundamental service procedures. The Passport shop manual pairs its base chapters with the 1982 updates, and the parts catalog links exploded-view callouts to Honda part numbers for the 1981 model.

CD70 coverage is limited to a valve-seat service note.

PDF Search, Navigation, and Page Count

Text search and diagrams. The parts catalog has searchable parts lists, with callouts embedded in the illustrations. Both shop manuals lack text search. The 50/65/70 volume has page-by-page bookmarks, while the Passport shop manual and parts catalog use their contents pages for navigation. Small wiring labels are easier to read at higher zoom, and some wire codes on the Passport base diagram remain faint.

The ZIP contains three printable PDFs with 441 pages total. The total includes the 30-page CL70/C70/C70M supplement, the 31-page Passport addendum, the cover and introductory pages, and 10 memo pages across the two shop manuals.

Engine Overhaul, Wiring, and Parts Identification

This selection of topics includes major shop procedures. The Passport manual also covers high-altitude carburetor adjustment and U.S.-model crankcase breather service.

• Engine overhaul: Engine removal and installation, cylinder-head and valve service, piston and ring inspection, oil-pump service, and cam-chain tensioner checks.

• Clutch and transmission: Clutch inspection, gearshift linkage service, shift drum and fork inspection, crankcase separation, crankshaft checks, and kick-starter service.

• Chassis and brakes: Steering-head service, bottom-link and telescopic front suspension, rear shocks, swingarm, wheel bearings, drum brakes, drive chain, and controls.

• Fuel and electrical testing: Carburetor circuits, float and jet checks, ignition timing, charging output, electric-starter faults, and continuity checks for lighting and switches.

• Shop reference: Maintenance schedules, torque tables, clearances, wear limits, electrical test data, and five pairs of engine and running performance charts.

• Tools and parts: A 21-item special-tool chart, additional Passport tool references, and 36 exploded parts diagrams with corresponding Honda part-number lists.

The Passport manual suits technicians and experienced owners familiar with standard workshop procedures, electrical testing, and the use of measuring and service tools.

Engine, Clutch, and Gearshift Service

The earlier manual uses the CL70 as the reference for the 70-series supplement and calls out C70 and C70M differences in clutch, transmission, suspension, starting, and ignition. The illustrations show the engine oil routes, the oil-damped cam-chain tensioner, and section views of the clutch and transmission.

The Passport manual distinguishes work that can be done with the engine in the frame, such as servicing the external gearshift linkage, from shift drum and fork work that requires engine removal and crankcase separation. Its top-end sections flag the oil passages that feed the camshaft and rocker arms because a blockage can starve both of lubrication.

Chassis, Carburetion, and Electrical Diagnosis

The chassis sections cover wheel hubs, steering bearings, rear suspension, brake inspection, cables, air-cleaner service, and exhaust inspection. Separate S50/S65 brake information and the CL70 telescopic-fork procedures help match the job to the chassis.

The fuel chapters cover choke operation, jets and needles, and model-specific carburetor settings. The Passport model-identification page shows where to find the frame number, engine number, VIN label, and carburetor ID. The carburetor chapter also warns that overtightening the pilot screw can damage it and its seat.

The earlier electrical sections include contact-breaker, spark-advance, generator, and selenium-rectifier checks. The Passport base manual covers starter motor and clutch service, while the 1982 addendum adds CDI and revised charging-system tests. Nine wiring diagrams include the S50/S65, both C70M export configurations, and separate Passport base and 1982 circuits. Cable and harness routing drawings show where the wiring runs on the vehicle.

Special Tools and Shop Safety

The earlier manual identifies tool set 07900-1180000 for the CL70, C70, and C70M, shared with the C65/S65. Individual references include drive-sprocket holder 07922-0400000, flywheel puller 07933-0010000, valve-guide reamer 07984-0980000, and Passport bearing-driver handle A 07749-0010000.

Keep fuel work away from ignition sources, ventilate running-engine tests, and isolate the battery before electrical or starter-system repair. Battery electrolyte and charging gases require care.

Sample Valve and Carburetor Specifications

For the 1980–1981 C70 Passport, the base manual specifies 0.05 mm (0.002 in) for both intake and exhaust valve clearance with the engine cold, below 35°C (95°F), at top dead center on the compression stroke.

The same manual specifies a carburetor float level of 10.7 mm (0.42 in) with the float tip just touching the float valve.