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  • Intro

    C70 dimensions, torque specifications, model history and more.

    Specifications

    Honda C70 Specifications
    English
    Metric
    Dimensions Overall Length
    71.1 in.
    1805 mm
    Overall Width
    26.2 in.
    685 mm
    Overall Height
    39.2 in.
    995 mm
    Wheelbase
    46.5 in.
    1180 mm
    Seat Height
    29.9 in.
    760 mm
    Min. Ground Clearance
    5.1 in.
    130 mm
    Dry Weight
    184 lbs.
    83.5 kg
    Frame Type Pressed & tube steel type
    F suspension, travel Leading link, travel 2.2 in. (55 mm)
    R suspension, travel Swing arm, travel 2.4 in. (60 mm)
    F tire size, pressure 2.25x17-4PR, 28 psi 2.25x17-4PR, 2.0 kg/cm2
    R tire size, pressure 2.50x17-6PR, 28 psi (40 psi when laden) 2.50x17-6PR, 2.0 kg/cm2 (2.8 when laden)
    F brake, lining area Cable, Internal expanding shoes, area 13.4 sq-in. (86.4 sq-cm)
    R brake, lining area Rod, Internal expanding shoes, area 13.4 sq-in. (86.4 sq-cm)
    Fuel capacity
    1.05 US gal./4.0 l.
    Fuel reserve capacity
    0.21 US gal./0.8 l.
    Caster angle 64 deg.
    Trail length
    2.8 in./ 70 mm
    Engine Type Air cooled, 4 stroke OHC engine
    Cylinder arrangement Single cylinder 80 deg inclined from vertical
    Bore and stroke 1.850 x 1.630 in. 47.0 x 41.4 mm
    Displacement 4.4 cu-in. 72cc
    Compression Ratio 8.8 : 1
    Valve train Chain driven overhead camshaft
    Maximum horsepower
    5.0 BHP at 7000 rpm
    Maximum torque 3.9 lb/ft at 5500 rpm 0.56 kg-m at 5500 rpm
    Oil capacity
    0.74 US qt.
    0.7 l
    Lubrication system Forced and wet sump
    Cylinder head compression pressure 178 +/-7 psi at 1000 rpm 12.5 +/-0.5 kg/cm2 at 1000 rpm
    Intake valve opens 0 deg BTDC
    Intake valve closes 20 deg ABDC
    Exhaust valve opens 25 deg BBDC
    Exhaust valve closes 5 deg ATDC
    Valve tappet clearance
    IN-EX 0.0002 in.
    IN-EX 0.05mm
    Idle speed 1500 +/-100 rpm
    Carburation Carburettor Type Piston valve (slide), 14mm (0.55") venturi bore
    ID. Number 1980 model: PB32A 1981 model: PB32C
    Float Level
    0.42"
    10.7mm
    Drive Train Clutch Wet, multi plate, semi-auto centrifugal type
    Transmisson 3 speed constant mesh
    Primary reduction 4.058
    Gear Ratio 1 3.272
    Gear Ratio 2 1.722
    Gear Ratio 3 1.190
    Final reduction 2.571, drive sprocket XXT, driven sprocket XXT
    Gear shift pattern Left foot operated return system, N-1-2-3
    Electrical Ignition Flywheel magneto
    Points Gap
    0.012 - 0.016"
    0.3 - 0.4 mm
    Ignition Timing "F" Mark
    15o BTDC, Static
    Advance Start 1875 rpm
    Full Advance
    30o BTDC, at 2900 rpm
    Starting System Kick starter and/or starter motor
    Generator Flywheel AC generator, 57W at 5000 rpm
    Battery Capacity 6 V, 11 Ah
    Spark plug (normal) NGK C7HS or ND U22FS
    Spark plug (cold climates) NGK C6H or ND U20FS
    Spark plug (high speeds) NGK C9H or ND U24FB
    Spark Plug Gap 0.024 - 0.028" / 0.6 - 0.7 mm
    Fuse Capacity 10 A

    Torque Specifications

    Torque Specifications
    Torque
    Item
    Quantity
    Thread dia. (mm)
    kg-m
    ft-lb
    Engine Cylinder Head Cover
    4
    6
    0.9 - 1.2
    7 - 9
    Camshaft Sprocket
    3
    5
    0.5 - 0.9
    4 - 7
    Clutch Locknut
    1
    14
    3.8 - 4.5
    28 - 33
    Final Drive Sprocket
    2
    6
    1.0 - 1.4
    7 - 10
    Flywheel
    1
    10
    5.5 - 6.5
    40 - 47
    Spark Advancer
    1
    6
    0.9 - 1.2
    7 - 9
    Frame Steering Stem Nut
    1
    22
    6. 0 - 9.0
    43 - 65
    Handlebar Setting Nut
    2
    8
    2.0 - 3.0
    14 - 22
    Steering Lock
    2
    6
    0.6 -1.3
    4 - 9
    Front Axle Nut
    1
    10
    3.0 - 4.0
    22 - 29
    Engine Hanger Bolt
    2
    8
    2.5 - 3.5
    18 - 25
    Rear Axle Nut
    1
    12
    4. 0 - 5.0
    29 - 36
    Final Driven sprocket
    4
    8
    2.0 - 2.5
    14 - 18
    Rear Brake Torque Link
    2
    8
    1.0 - 2.0
    7 - 14
    Rear Shock Absorber
    4
    10
    2.0 - 3.0
    14 - 22
    Foot Peg
    4
    8
    2.0 - 2.5
    14 - 18
    Swing Arm Pivot Bolt
    1
    10
    3.0 - 4.0
    22 - 29
    Front Suspension Pivot Bolt
    2
    8
    1.0 - 2.0
    7 - 14
    Front Suspension Pivot Bolt
    2
    8
    2.0 - 3.0
    14 - 22
    Front Shock Absorber Upper Bolt
    2
    8
    2.5 - 3.5
    18 - 25
    Front Turn Signal Stay
    4
    0.35 - 0.5
    2.5 - 3.6
    General 5 mm bolt/nut
    0.45 - 0.6
    3.3 - 4.3
    6 mm bolt/nut
    0.8 - 1.2
    6 - 9
    8 mm bolt/nut
    1.8 - 2.5
    13 - 18
    10 mm bolt/nut
    3.0 - 4.0
    22 - 29
    12mm bolt/nut
    5.0 - 6.0
    36 - 43
    5 mm screw
    0.35 - 0.5
    2.5 - 3.6
    6 mm screw
    0.7 - 1.1
    5 - 8
    6 mm flange bolt/nut
    1.0 - 1.4
    7 - 10
    8 mm flange bolt/nut
    2.4 - 3.0
    17 - 22
    10 mm flange bolt/nut
    3.0 - 4.0
    22 - 29

    Manuals

    These will open as PDFs

    Parts Catalog  Service Manual

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