1978 ATC70 Specifications

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General Specs
ManufacturerHonda
Year1978
ModelATC70
Model CodeATC70
Product Code957
Frame VIN LocationStamped on left side of frame neck
Engine Serial LocationStamped on bottom of left crankcase cover
Frame Starting NumberATC70-2000036
Engine Starting NumberATC70E-2000007
Chassis
Length1305 mm (51.4 in)
Width800 mm (31.5 in)
Height805 mm (31.7 in)
Seat Height570 mm (22.4 in)
Wheelbase895 mm (35.2 in)
Ground Clearance85 mm (3.3 in)
Dry Weight75.5 kg (166.5 lb)
Caster Angle20°
Trail32 mm (1.26 in)
Tire & Rim
Front Tire Size16x8-7
Rear Tire Size16x8-7
Engine
Engine TypeOHC single cylinder 4 stroke air cooled
Cylinder ArrangementSingle cylinder inclined 80 degrees from vertical
Valve TrainOverhead camshaft - chain drive
Displacement72 cc (4.4 ci)
Bore47 mm (1.9 in)
Stroke41.4 mm (1.6 in)
Compression Ratio7.5:1
Cylinder Compression975-1175 kPa (141-170 psi)
Horsepower3.5 PS (3.5 hp)
Torque0.42 kg/m3 (3 ft-lb)
Starter TypeRecoil
Fuel TypeRegular Gasoline
Oil Capacity - Oil Change0.8 L (0.8 US qt; 0.7 Imp qt)
Engine Dry Weight18.95 kg (41.8 lb)
Drive Train & Transmission
Clutch TypeAutomatic wet multiplate centrifugal
Transmission Type3 Speed
Primary Reduction4.058
First Gear3.273
Second Gear1.722
Third Gear1.190
Final Reduction2.500
Gear Shift Pattern3 - 2 - 1 - N
DrivelineChain
Carburetor
BrandKeihin
Identification MarkPB38A
TypePiston valve
Throttle Bore13 mm (0.5 in)
Main Jet#58
Pilot Jet/Slow Jet#38
Air Jet#150
Pilot Screw Adjustment1 3/4 Turns out
Float Level10.7 mm (0.4 in)
Engine Idle1500 RPM
Air Filter TypeOiled Urethane Foam
Fuel Tank Capacity4 L (1.1 US gal; 0.9 Imp gal)
Fuel Tank Reserve0.8 L (0.2 US gal; 0.2 Imp gal)
Ignition
Ignition TypePoints
Spark PlugC7HS (NGK), U22FS (Denso)
Spark Plug Gap Max0.6-0.7 mm (0.024-0.028 in)
Points Gap Max0.3-0.4 mm (0.012-0.016 in)
Condenser Capacity0.27-0.33 μF
Electrical
Voltage6 V
Power TypeAC
Alternator Max Output18 W
Brakes
Rear Brake OperationLeft Hand
Front Brake TypeN/A
Rear Brake TypeDrum
Suspension
Front SuspensionRigid
Rear SuspensionRigid

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