Honda ATC70 ATV Shop Manual Collection – 1985 (P/N 6195700)

The shop manual provides the maintenance and repair procedures; the difficult-shifting bulletin refers back to those procedures for its replacement work. The tool bulletin identifies required equipment and approved substitutes, while the set-up instructions cover assembly and pre-delivery checks.

The tool bulletin covers additional ATC70 model years; that broader tool applicability does not extend the shop manual’s model coverage. Honda specifies that set-up and pre-delivery service must be performed by an authorized Honda ATV dealer.

PDF Search, Navigation and Wiring Detail

Text search and diagram viewing: PDF text search and embedded bookmarks are unavailable. The contents page and individual section indexes provide navigation references. Small wire-color and terminal labels in the wiring diagrams are readable when enlarged.

One printable 184-page PDF in English contains all four publications. The total includes their cover, introductory, memo and blank pages, plus two additional blank separator pages and one rear cover.

Engine, Drivetrain and Chassis Service

These selected coverage highlights outline the main workshop areas. Other included topics range from spark arrester cleaning to throttle-lever disassembly and assembly.

• Maintenance and lubrication: Service schedules, oil filter rotor and screen cleaning, oil-pump inspection and overhaul, lubrication points, and routine adjustment procedures.

• Fuel system: PB-38A piston-valve carburetor removal, disassembly, inspection and reassembly, with float-level checks, pilot-screw adjustment, and fuel-supply troubleshooting.

• Cylinder head and piston: Step-by-step procedures for valve-guide replacement, valve-seat refacing, cylinder and piston removal, ring installation, and camshaft timing.

• Clutch and transmission: Centrifugal clutch inspection and rebuilding, gearshift-linkage service, crankcase separation, transmission assembly, and crankshaft and connecting-rod checks.

• Recoil starter and ignition: Starter rebuilding, alternator removal, cam-chain tensioner inspection, contact-point timing adjustment, electrical tests, and wiring diagrams.

• Wheels, steering and brakes: Wheel-bearing replacement, steering-head bearing and race service, rear drum-brake overhaul, axle inspection, and drive-chain and sprocket work.

The repair sections suit mechanically proficient owners and technicians equipped for precision measurement and special-tool work; the manual assumes familiarity with standard workshop procedures.

Engine Work and Carburetor Overhaul

Planning engine removal: The manual distinguishes work that can be performed with the engine installed from transmission and crankshaft service requiring engine removal and crankcase separation. That distinction helps you assess the teardown and equipment needed before starting a repair.

Cylinder-head inspection covers cam lobes, rocker arms, valve stems, guides, springs and head warpage. Valve-seat illustrations explain contact position and seat width; the manual distinguishes seat refacing from the valves themselves, which must not be ground.

The carburetor section includes throttle-valve and jet-needle inspection, float-valve checks, jet cleaning and post-overhaul adjustments. Its pilot-screw caution identifies a specific damage risk: tightening the screw against its seat can damage the seat.

Clutch, Shifting and Recoil Starter Details

Clutch assembly illustrations identify the friction discs, plates, rollers, damper springs and one-way clutch arrangement. Transmission drawings show gear order, thrust washers, snap rings and shift-fork positions rather than leaving assembly relationships to a general parts list.

For affected engines, Service Bulletin ATC70 #4 specifies replacement of the shift-drum stopper arm and stopper plate together. It identifies replacement set 24410-957-305 and the individual components, allowing the update to be distinguished from routine linkage adjustment.

Recoil-starter coverage includes rope, pulley, spring and ratchet inspection, assembly positions, spring preload and an operational check.

Electrical Diagnosis and Chassis Reference

Ignition-coil resistance checks, a condenser-capacity test, alternator checks and engine-stop-switch continuity tables support electrical fault tracing. The wiring diagrams identify the ignition coil, spark plug, alternator, neutral switch and wire colors.

Cable and harness routing drawings, ignition-timing mark views and the engine-lubrication diagram supplement the assembly illustrations. Troubleshooting charts connect starting problems, loss of power, poor running, clutch faults and difficult shifting with checks and possible causes.

For the pressed backbone chassis, the manual details steering-bearing adjustment, bearing and race replacement, rear brake-cam and shoe assembly, and rear-axle bearing service. Tire coverage includes bead removal, cold-patch repair and rubber-plug repair, with the plug method identified as an emergency repair.

Examples of Compression, Clearance and Torque Data

The compression-test section specifies 1,200 ± 150 kPa as standard and 900 kPa as the service limit, for a warm engine with the throttle fully open.

Cylinder-to-piston clearance is listed at 0.005–0.035 mm standard, with a 0.15 mm service limit. The inspection section explains the related cylinder and piston measurements.

Torque references include 38–45 N·m for the clutch lock nut and a final 9–12 N·m specification for the cylinder-head nuts within the described staged tightening procedure.

Keep the machine securely supported during service and follow the manual’s precautions for gasoline, the recoil-starter spring and brake dust.