motorcycle

  • C70 Specifications

    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

  • Timing Adjustment

    Adjusting Timing 

    http://ct90-ct110.com/Adjusting-Timing.html

    NOTE: Start with a valve inspection and possible adjustment, if your CT is not operating properly, even if it seems your problem is not related to the valves! If you just purchased a CT, start with the valve inspection and adjustment just to make sure everything is OK or if the engine doesn't want to start or is not operating properly. The second step should be inspecting and/or adjusting the contact breaker points, you can then return here to inspect and/or adjust the timing.

    There are two methods for inspecting and adjusting the timing;

    1. Static timing
    2. Dynamic timing
  • 1981 Honda C70 passport parts Catalog

    1981 Honda C70 passport parts Catalog
  • C 70 paint source

    Valspar 85201 gloss Exotic Sea at a Lowes

  • C70 Passport

    c70 carburetor

    honda, c70, passport, 1981

  • CT 200

    The 1964 Honda Trail 90, Model CT200 was also manufactured in 1965, with essentially no change in common characteristics. The Honda parts listing always mentions the CT200 as a 1964 and does not mention 1965. The ending Serial or VIN Number for the year of 1964 is unknown. The year designation found on state titles or registrations usually refers to the year in which the CT200 was first sold. Production and dealer ordering (often controlled by American Honda) sometimes left CT200's on dealer floor rooms into the following years. The 1964 model introduced an engine skid plate, integrated the speedometer as part of the headlight bucket, and added metal folding foot-pegs.
     
  • CT 200 Carb

    I promised myself I wouldn't start on this until the C70 is assembled. For the moment here are some photos of it's gen one carb.

  • CT 200 Specs

    The 1964 Honda Trail 90, Model CT200 was also manufactured in 1965, with essentially no change in common characteristics. The Honda parts listing always mentions the CT200 as a 1964 and does not mention 1965. The ending Serial or VIN Number for the year of 1964 is unknown. The year designation found on state titles or registrations usually refers to the year in which the CT200 was first sold.

    Production and dealer ordering (often controlled by American Honda) sometimes left CT200's on dealer floor rooms into the following years. We have seen several cases of CT200's with titles stating a year late into the 1960's or even the early 1970's. This is the first year with an engine skid plate. This is the first year of the speedometer being part of the headlight bucket, with a shape that was like a smooth circle section on top and a flat bottom. This is the first year for the metal folding foot pegs.

  • Danskin Trail

    Motorcycle Riding with Stan Kolby. This is a full day motorcycle ride through the Danskin Mountains. The terrain ranges from easy USFS roads to three-attempt hill climbs. 

  • Dead electric starters c70

    Everything in the electric start system focuses on one thing - the  "neutral switch".  It isn't really a "switch". It's actually a plastic and metal plug under  the countershaft sprocket cover with a metal circuit running through  it from a wire on the outside to a contact on the inside end. 

  • DR 650 2006

    Blue. Racks


    FMF Q2 pipe

  • DR 650 2007

    Racks 

  • Electrical Trouble Shooting

    Electrical problems can pop up at any time and can seem hard to fix but they really aren't. Most of the time, anyway. Most everything can be "Proved" (tested) with an Ohmmeter and a some things can be proved with a simple circuit tester.

  • Honda 350 Carburetor Insulator

    When honda made xl350 r  the OEM carburetor insulator, or intake manifold, listed for a mere $60. Honda founder Soichiro Honda promised that  stock parts for any Honda manufactured would always be available. With his passing in 1991 the MBAs took over and scuttled that promise.

    The other problem is Honda didn't sell a lot of these two-carb 350s . As a result there just aren't that many replacement parts around: OEM or aftermarket. Enter Ebay . . .

  • Honda C70 Passport

    The Honda Super Cub and its varients: C100, C50, C70, C90, C100EX and C70 Passport is the most popular motor vehicle in the world! It has been in continuous manufacture since 1958 with production surpassing 60 million in 2008.

    The Super Cub built the Honda Motor company. It is a simple motorcycle with a four stroke single cylinder engine ranging in displacement from 49 to 109 cc (3.0 to 6.7 cu in).

    The Super Cub was developed on the concept of a two wheeler for everyman, one that would appeal to both developed and developing countries, urban and rural. The new motorcycle needed to be technologically simple to survive in places without up to date know how and access to advanced tools or reliable spare parts supplies.

    Honda partner Takeo Fujusawa's concept required that it could be ridden with one hand while carrying a tray of soba noodles. Fujusawa sold the concept to Soichiro Honda with the promise, "If you can design a small motorcycle, say 50 cc with a cover to hide the engine and hoses and wires inside, I can sell it. I don't know how many soba noodle shops there are in Japan, but I bet you that every shop will want one for deliveries."

  • Keihin PB32C Carburetor

    Keihin Stock Carburetor 1981 Honda c70 Passport

    Keihin PB32C Specifications
    Venturi Dia. 14mm (0.55")
    Identification # PB32C
    Float level 10.7mm (0.42")
    Main Jet #88
    Slow Jet #35
    Jet Needle 72 C
    Pilot Screw turn-out 2.5

  • XL350 R

    I bought this in 2005 as an all around go-to bike. $1000 on CL. It has a leaky seal. A cobra exhaust that is loud enough to hear a mile away. From the start, it was a tough starter. Turns out to be a cracked carburetor insulator. More on that later.

  • Yahama WR 450 F

     

    2007 Yamaha WR 450 F

    • handwarmers
    • baja designs
    • desert tank
  • Yamaha WR450 F

    2007 Yamaha WR450 F.