Need help?Do you have a question about the Honda C70 1980 and is the answer not in the manual?
General| Displacement | 72 cc |
|---|---|
| Bore x Stroke | 47 mm x 41.4 mm |
| Compression Ratio | 8.8:1 |
| Fuel System | Carburetor |
| Front Suspension | Telescopic fork |
| Front Brake | Drum |
| Rear Brake | Drum |
| Transmission | 3-speed |
| Rear Suspension | Swingarm with dual shocks |
| Fuel Capacity | 3.5 liters |
| Height | 1, 000 mm |
| Wheelbase | 1, 180 mm |
| Top Speed | 80 km/h |
Essential safety precautions for operating and maintaining the motorcycle.
Rules and recommendations for servicing the motorcycle correctly and safely.
Key technical specifications for the Honda C70 motorcycle.
Specified torque values for various fasteners during assembly and maintenance.
List of special and common tools required for maintenance and repair.
General instructions and information related to lubrication service.
Specifications for engine oil capacity and recommended oil types.
Common lubrication problems and their potential causes and solutions.
Procedure for checking and maintaining the engine oil level.
Steps for draining and replacing the engine oil.
How to clean the engine oil filter screen.
Procedure for cleaning the centrifugal oil filter.
Steps to remove the oil pump from the engine.
How to inspect the oil pump for wear or damage.
Steps for disassembling the oil pump.
Steps for assembling the oil pump.
How to install the oil pump back into the engine.
How to lubricate control cables for smooth operation.
General instructions and information related to inspection and adjustment.
List of common and special tools for front wheel and suspension work.
Specifications for spark plug, gap, timing, and valve clearance.
Specified torque values for various fasteners related to suspension and steering.
Inspection of fuel lines for deterioration, damage, or leakage.
How to check and adjust the carburetor choke operation.
How to inspect, clean, or replace the air cleaner element.
How to inspect, gap, and install the spark plug.
Procedure for inspecting and adjusting valve clearance.
How to inspect, clean, and adjust contact breaker points.
How to check and adjust the ignition timing using a timing light.
How to replace the spark advancer if it malfunctions.
How to adjust the cam chain tension for proper timing.
How to adjust the engine idle speed using the throttle stop screw.
How to measure cylinder compression to diagnose engine issues.
How to inspect the drive chain for slack and wear.
Steps to adjust the drive chain slack and tension.
Procedure for cleaning and lubricating the drive chain.
How to remove, inspect, and replace the battery.
How to check for brake shoe wear and alignment.
How to measure and adjust front brake lever free play.
How to check brake cable, rod, pedal, and lever for loose connections.
How to adjust the brake light switch.
How to adjust the headlight beam vertically and horizontally.
How to adjust the clutch for proper operation.
How to inspect the side stand for wear and check spring tension.
How to check front forks and rear shock absorbers for proper function.
Check chassis nuts and bolts for proper torque and safety clips.
Check tire pressure, wheels for damage, and tread depth.
How to check steering head bearings and adjust handlebar play.
General instructions for working with gasoline and fuel system components.
Troubleshooting common engine and fuel system problems.
Steps to remove the carburetor and its associated parts.
How to disassemble the throttle valve and related components.
How to remove, inspect, and service the float and jets.
How to assemble the carburetor, including jets and holders.
How to measure the float level and adjust if necessary.
How to install the throttle valve assembly and related parts.
Steps to install the carburetor and perform initial adjustments.
How to remove, clean, and install the fuel strainer.
How to remove, install, and adjust the pilot screw.
How to install the pilot screw limiter cap.
How to adjust the carburetor for high altitude operation.
Steps to remove and install the fuel tank.
General instructions for engine service and component identification.
Engine weight, oil capacity, and cylinder/piston specifications.
Specified torque values for engine hanger bolts and footpegs.
Step-by-step procedure for removing the engine from the motorcycle.
Step-by-step procedure for installing the engine back into the motorcycle.
General instructions for cylinder head maintenance with the engine installed.
List of special and common tools for cylinder head service.
Specified torque values for cylinder head components.
Specifications for compression, camshaft, O.D.s, and clearances.
Troubleshooting common problems related to the cylinder head and valves.
Steps to remove the cylinder head from the engine.
How to disassemble the cylinder head, removing O-rings and gasket.
How to inspect rocker arms for wear or damage and measure I.D.
How to inspect the rocker arm shaft for wear or damage.
How to measure camshaft lobes and check for wear or damage.
How to measure camshaft journal O.D. and determine oil clearance.
How to measure the free length of inner and outer valve springs.
How to inspect valve stems and guides for wear and measure clearance.
Step-by-step procedure for replacing valve guides.
How to inspect valve seats and perform refacing if necessary.
How to install valve springs, retainers, and cotters into the cylinder head.
Steps to install the cylinder head assembly and related components.
General instructions for cylinder and piston service.
Specifications for cylinder I.D., piston rings, bore, and clearances.
Troubleshooting common cylinder and piston problems.
Steps to remove the cylinder from the engine.
How to inspect the cylinder bore for wear or damage.
Steps to remove the piston pin clip and piston.
How to inspect piston rings for clearance and the piston for damage.
How to measure the piston pin outside diameter.
How to install piston rings correctly, ensuring proper spacing.
Steps to install the piston, piston pin, and clip.
Steps to install the cylinder, O-ring, gasket, and ensuring proper oil flow.
General instructions for clutch service with the engine in the frame.
Troubleshooting common clutch problems like slipping or dragging.
Specifications for clutch spring free length, disc thickness, warpage, and O.D.s.
Steps to remove the right crankcase cover.
How to remove the clutch lifter and adjusting bolt.
Steps to remove the clutch lever, cam, and outer cover.
How to disassemble the clutch, removing rings, plates, and discs.
How to measure the clutch spring free length.
How to measure clutch disc thickness and check for discoloration.
How to inspect the drive gear for wear or damage and measure its O.D.
How to inspect the clutch center guide for wear or damage.
How to assemble the clutch, placing springs, plates, and discs.
How to install the clutch center guide, drive gear, and related components.
How to install the right crankcase cover, including O-rings and bolts.
General instructions for servicing the gearshift linkage.
Troubleshooting common shifting problems like hard shifting or jumping out of gear.
Steps to remove the gearshift linkage components.
Steps to install the gearshift linkage components correctly.
General instructions for servicing transmission and crankshaft components.
Troubleshooting common transmission and crankshaft problems.
Steps to separate the crankcase halves for service.
Steps to remove the crankshaft from the crankcase.
How to inspect the crankshaft for runout and measure clearances.
How to install the timing sprocket, aligning it with the crankshaft.
Steps to disassemble the transmission and crankshaft.
How to disassemble the kick starter spindle.
How to disassemble transmission gears and inspect them.
How to disassemble the shift drum, remove guide pins and forks.
How to assemble the mainshaft and countershaft gears.
How to install shift forks on the shift drum.
How to assemble the kick starter.
How to install the drum and transmission into the crankcase.
General instructions for servicing the cam chain tensioner.
Troubleshooting common cam chain tensioner problems like noise or wear.
Steps to remove the tensioner push rod, bolts, and springs.
How to inspect the push rod and spring for wear or damage.
How to install the cam chain tensioner and push rod.
General instructions for front wheel and suspension service.
List of special and common tools for front wheel and suspension work.
Specified torque values for steering stem, axle, and suspension components.
Troubleshooting common problems with steering, wheels, and suspension.
Steps to remove the headlight assembly.
How to disassemble and reassemble the headlight unit.
How to remove the headlight and handlebar mounting nuts.
How to install the speedometer and connect wiring.
Steps to install the speedometer, handlebars, and related components.
Steps to remove the handlebar and related controls.
Steps to install the handlebar, controls, and related components.
Steps to remove the front wheel from the forks.
How to check wheel bearing play and inspect for noise.
How to replace wheel bearings and distance collars.
How to check wheel rim runout.
How to inspect the axle and its runout.
How to measure the brake drum's inside diameter.
How to measure the brake lining thickness.
Steps to disassemble the brake panel.
How to assemble the brake panel with shoes, springs, and cam.
Steps to install the front wheel, brake components, and shock absorbers.
Steps to remove the front shock absorbers.
How to disassemble the shock absorber.
How to inspect the shock body for oil leaks and measure spring free length.
How to inspect suspension arm bushings and measure their dimensions.
How to assemble the suspension arms.
How to install the shock absorbers and suspension arms.
Steps to remove the front fork and steering stem.
How to remove and tighten the steering stem nut.
How to replace the lower cone race for steering head bearings.
How to replace ball races in the steering head.
General instructions for rear wheel and suspension service.
Troubleshooting common rear wheel and suspension problems.
Steps to remove the rear wheel from the motorcycle.
How to inspect the rear axle and measure its runout.
How to check rear wheel bearing play.
How to replace rear wheel bearings.
How to check wheel rim runout.
How to inspect damper rubbers for damage or deterioration.
How to measure the brake drum's inside diameter.
How to measure the brake lining thickness.
Steps to replace brake shoes and springs.
Steps to install the rear wheel, axle, and related brake components.
How to remove the rear wheel driven flange.
How to inspect the driven sprocket for wear or damage.
How to replace the sprocket, lock plates, and bolts.
How to inspect the driven flange bearing for play.
How to replace wheel bearings and distance collars.
How to install the driven flange and sleeve.
Steps to remove the upper and lower shock absorber mounting hardware.
How to disassemble the shock absorber.
How to measure the shock absorber spring's free length.
How to assemble the shock absorber.
How to install the shock absorbers and check their operation.
Steps to remove the muffler, rear wheel, driven flange, shock absorbers, and swingarm.
How to inspect pivot bushings and bolts for wear.
How to install the swingarm, bracket, shock absorbers, and related components.
General instructions regarding battery maintenance and charging.
List of tools required for battery and charging system service.
Specified torque value for the generator rotor/flywheel bolt.
Specifications for battery capacity, gravity, charging rate, A.C. generator, and rectifier.
Troubleshooting common battery and charging system problems.
How to test battery specific gravity using a hydrometer.
Steps to remove the A.C. generator stator assembly.
How to test the stator coil for continuity.
Steps to remove the generator rotor.
How to install the stator and route generator leads.
Steps to remove the rectifier.
How to check the rectifier for continuity.
General instructions for ignition system service.
Troubleshooting common ignition problems.
Steps to remove the ignition coil.
How to test ignition coil continuity using a multimeter.
How to perform a 3-point spark test with a coil tester.
Steps to remove the contact breaker point cover and points.
How to test condenser capacity with a tester.
How to replace point setting screws and the contact point.
How to check the spark advancer for proper function.
Steps to replace the spark advancer.
General instructions for starter motor service.
Troubleshooting common electric starter problems.
Steps to remove the starter motor.
How to inspect starter motor brushes and measure length/tension.
How to inspect the commutator for discoloration and check continuity.
How to check brush wires for continuity and shorts.
How to assemble and install the starter motor.
How to check the starter relay for clicks and continuity.
Steps to remove the A.C. generator, starter clutch, and drive chain.
Steps to disassemble the starter clutch.
How to inspect starter clutch rollers for wear.
How to assemble the starter clutch.
General instructions for switch service and continuity testing.
Guidelines for handling wires, connectors, and using testers.
How to inspect and test front and rear brake switches.
How to check the neutral switch for continuity.
How to test handlebar cluster switches like headlight, turn signal, and horn.
How to test the headlight hi-lo switch.
How to test the turn signal switch.
How to test the horn button operation.
How to test the starter button for continuity.
How to test the engine stop switch operation.
How to check the ignition switch continuity.
Common causes and troubleshooting steps for engine starting issues.
Troubleshooting steps for an engine that lacks power.
Troubleshooting poor engine performance at idle and low speeds.
Troubleshooting poor engine performance at high speeds.
Troubleshooting causes of smoking exhaust.
Troubleshooting clutch problems.
Troubleshooting issues with difficult gear shifting.
Troubleshooting causes of unusual engine noise.
Troubleshooting why the motorcycle pulls to one side.
Troubleshooting issues with front and rear shock absorbers.
Troubleshooting faulty brake performance.
Troubleshooting issues related to an elongated drive chain.
General information specific to the '82 Addendum.
Torque values listed in the '82 Addendum.
Diagram showing cable and harness routing for the '82 Addendum.
Maintenance schedule specific to the '82 Addendum.
Lubrication recommendations and specifications from the '82 Addendum.
Information on adjusting the carburetor choke as per the '82 Addendum.
Service instructions for the air cleaner as per the '82 Addendum.
Valve clearance specifications from the '82 Addendum.
Ignition timing specifications from the '82 Addendum.
Battery information from the '82 Addendum.
Fuel system specifications from the '82 Addendum.
High altitude adjustment instructions from the '82 Addendum.
Cylinder head and valve specifications from the '82 Addendum.
Clutch specifications from the '82 Addendum.
Clutch assembly steps from the '82 Addendum.
Clutch installation steps from the '82 Addendum.
Transmission specifications from the '82 Addendum.
Cam chain tensioner information from the '82 Addendum.
Push rod service details from the '82 Addendum.
Cam chain tensioner service information from the '82 Addendum.
Tensioner and push rod service details from the '82 Addendum.
Front wheel and suspension specifications from the '82 Addendum.
Rear wheel and suspension specifications from the '82 Addendum.
Battery and charging system specifications from the '82 Addendum.
Ignition system information from the '82 Addendum.
Ignition system specifications from the '82 Addendum.
Troubleshooting ignition system issues from the '82 Addendum.
Electric starter information from the '82 Addendum.
Troubleshooting common engine performance issues from the '82 Addendum.
Troubleshooting steps for engine starting problems from the '82 Addendum.
Troubleshooting steps for an engine lacking power from the '82 Addendum.
Troubleshooting poor engine performance at idle and low speeds from the '82 Addendum.
Troubleshooting poor high-speed performance from the '82 Addendum.
Troubleshooting smoking exhaust issues from the '82 Addendum.
Troubleshooting faulty clutch issues from the '82 Addendum.
Troubleshooting difficult shifting from the '82 Addendum.
Troubleshooting engine noise issues from the '82 Addendum.
Troubleshooting motorcycle pulling issues from the '82 Addendum.
Troubleshooting faulty shock absorbers from the '82 Addendum.
Troubleshooting faulty brake issues from the '82 Addendum.
Troubleshooting elongated drive chain from the '82 Addendum.
To Next Page
