1983 ATC70 Specifications

General Specs
Model CodeTB03
Product Code957
Frame VIN LocationStamped on left side of frame neck
Engine Serial LocationStamped on bottom of left crankcase cover
Frame Starting NumberJH3TB030*DC800006
Engine Starting NumberTB03E-2800001
Owner Manual31957060
Service Manual6193704
Length1300 mm (51.2 in)
Width800 mm (31.5 in)
Height800 mm (31.5 in)
Seat Height570 mm (22.4 in)
Wheelbase895 mm (35.2 in)
Ground Clearance85 mm (3.3 in)
Dry Weight77 kg (169.8 lb)
Caster Angle20°
Trail32 mm (1.26 in)
Tire & Rim
Front Tire Size (HxW-R)16x8-7
Rear Tire Size (HxW-R)16x8-7
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)
Horsepower3.4 PS (3.4 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 Type4 Speed
Primary Reduction4.058
First Gear3.273
Second Gear1.938
Third Gear1.350
Fourth Gear1.043
Final Reduction2.769
Gear Shift Pattern4 - 3 - 2 - 1 - N
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 Capacity4.3 L (1.1 US gal; 0.9 Imp gal)
Fuel Tank Reserve0.8 L (0.2 US gal; 0.2 Imp gal)
Ignition TypePoints
Spark PlugCR7HS (NGK), U22FSR-L (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
Exciter Coil2.43-2.97 Ω
Ignition Coil Primary1.35-1.65 Ω
Ignition Coil Secondary w/o Cap7650-9350 Ω
Voltage6 V
Power TypeAC
Alternator Max Output18 W
Rear Brake OperationLeft Hand
Front Brake TypeN/A
Rear Brake TypeDrum
Front SuspensionRigid
Rear SuspensionRigid

Information on this page is provided in good faith that it is accurate, but in no way is the data guanteed to be accurate. If there are any mistakes, please contact me.