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Honda PC50 Owner's Manual
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Honda PC50 Owner's Manual

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MODEL PC50
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OWNER'S MANUAL
HONDA MOTOR CO., LTD. 1973

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Summary of Contents for Honda PC50

  • Page 1 MODEL PC50 OWNER’S MANUAL HONDA MOTOR CO., LTD. 1973...
  • Page 3 , further, it is not only easy to maintaSp and operate but is absolutely safe for even a beginner. The purpose of this manual is to enable you to keep the PC50 in the best condition and also to provide you with the procedure for performing simple adjustments.

  • Page 4: Table Of Contents

    CONTENTS OPERATING TIPS..........TOOL KIT ............MAINTENANCE SCHEDULE ......MAINTENANCE PROCEDURE ..... WIRING DIAGRAM ........TECHNICAL DATA ........

  • Page 5: Operating Tips

    O PERATING TIPS_________________ LAYOUT OF THE INSTRUMENTS AND CONTROLS © Speedometer © Front brake lever © Throttle grip © Horn button © Cycling pedal ® Rear brakfe lever ® Head light beam control switch © Decompression lever ® Lighting switch ®...
  • Page 6 © ®© Frame number (§) Engine number (3) Fuel cock Fuel tank...
  • Page 8 • CYCLING The engine disengaging clutch lever © is located at the rear right side of the engine. By shifting this lever, a selection can be made bet­ ween engine power drive and pedal­ ling. Position the lever in position ® for cycling with the pedal, and in position <3) when engine power is to be utilized,...
  • Page 9 • ENGINE POWER DRIVE ■ Fuel supply Fuel tank © with a capacity of 3 lit. (0.8 U .S .g a l/0 .6 6 Imp gal) is located below the seat on the left side. The filler cap is removed by twisting counter clockwise.
  • Page 10 ■ Engine Starting procedure Start the engine by following the procedures in the sequence listed below. (1) . Switch the fuel cock lever to the ON position. (2) For starting a cold engine, raise the choke lever. (3) Set the engine disengaging clutch lever to the ON position (vertical position).
  • Page 11 Decompression lever It is located inboard of the left handle grip and is operated by the thumb. The lever ® is used to decom­ press the cylinder to facilitate crank­ ing of the engine for starting. It is also used to stop the engine. °...
  • Page 12 ■ Riding ° Acceleration, deceleration To accelerate, twist the right hand throttle grip gradually inward; for deceleration, twist outward. ° Pedal assist When riding with a heavy load, with a rear rider, or when climbing a steep grade, the cycling pedal may be used to assist the engine.
  • Page 13 ■ Night riding Headlight control switch © located on the headlight case directly behind the speedometer Position (2) is for normal riding and when switched to position for night riding, the headlight and taillight will be ON. Headlight beam control switch © is located on the left handle bar grip.
  • Page 14 ■ Stopping, parking o Braking When slowing down or stopping the motorcycle, apply the brake levers on both the right and left handle (right side is for the front and left is for the rear brakes) together uniformly. Hold down the decom­ pression lever to stop the engine.

  • Page 15: Tool Kit

    TOOL KIT The tool kit ® is mounted under the seat at the right side of the fuel tank. Simple adjustments and parts replacement can be performed with the tool in this kit. The more difficult adjustments and repairs which are beyond the scope of the tool kit should be referred to the service dealer.
  • Page 16 ( A ) ® ( G ) © Spark plug-axle nut wrench (§) Screwdriver bit (§) Tool bag Application o The wrench ® can be used as a spark plug wrench by inserting the screwdriver bit @ into hole ® . o It can also be used to remove the axle nut by inserting the screwdriver bit into hole ©...

  • Page 17: Maintenance Schedule

    M A IN TEN A N CE SCHEDULE Periodic maintenance will not only keep your motorcycle in the peak of condition but will also assure extra long life. Perform the maintenance in accordance with the servicing schedule shown below. Further, refer to the succeeding section for the maintenance procedure.

  • Page 18: Maintenance Procedure

    M AINTENANCE PROCEDURE • SERVICING AND CHANGING ENGINE OIL ■ Engine oil Replenish the engine oil with quality oil of the proper grade and of the same type, do not dilute the oil by mixing gasoline or kerosene to the oil. Always maintain the engine oil at the proper level, insufficient oil may cause damage to the engine,...
  • Page 19 Viscosity of the oil to be used will vary with the outdoor tempera­ ture. Use the chart as a guide when selecting the oil.
  • Page 20 m o / . * . i f ) ■BBP ■ Oil change Perform the engine oil change in accordance with the schedule shown on page 15. Drain the oil while the engine is warm, by unscrewing the filler cap © and removing the drain plug ©...
  • Page 21 • THROTTLE CABLE AND DECOMPRESSION LEVER ADJUSTMENT ■ Throttle cable Normal throttle grip free play is approximately 10°. When it is found to be excessive, adjust the throttle cable adjuster ©. To adjust the throttle cable, slide back the rubber cap on the carburetor end of the cable.
  • Page 22 .The normal range of movement of the decompression lever is 1~1.5 cm (0 4 ~ 0 ,6 in). In making the adjustment, loosen the cable lock screw © and perform the adjustment with the cable end (2). Honda dealer will be able to provide you with the most precise adjustment.
  • Page 23 • BRAKE ADJUSTMENT ■ Front brake The brakes are the most important safety items, therefore, they should always be maintained in the best of condition. Raise the front wheel off the ground by stand, spin the front wheel and measure the amount the front break lever ©...
  • Page 24 hold. The lever free play (2) should be 0.6~1.2 in (15~30 mm). When adjustment is necessary, make the adjustment with the front brake adjusting Turning in the direction of ® will increase the free play, and (3). when turned in the direction of the play will decreatf*...
  • Page 25 ■ Rear brake Raise the rear wheel off the ground and check the free play (2) of the rear brake lever © in the same way as for the front brake, the play should be 0 . 4 ~ 0.6 in (1 0 ~ 1 5mm). Adjustment is made by the rear...
  • Page 26 brake adjusting nut Turning in the direction of ® will increase the play, (3). while turning in the direction of 0 will reduce the play.
  • Page 27 • ADJUSTING THE HANDLE HEIGHT Loosen the locking bolt at the top of the steering handle, hold the front wheel from moving and turn the steer­ ing handle to the right and left while raising. Retighten bolt after adjustment. « Caution : Do not loosen the steering handle lock bolt more than two turns...
  • Page 28 • AIR CLEANER SERVICING Air cleaner © is located at the center of the frame on the left side. Perform the servicing in accordance with the maintenance schedule. (1) Remove air cleaner cover and air cleaner case (2). (2) Disconnect the air cleaner con­ necting tube (D and then remove the air cleaner ©.
  • Page 29 ► REPLACING LIGHT BULBS When changing the light bulbs, always replace the bulb with that of the specified type and rating. This is important to prevent the electrical lighting circuit from malfunctioning. Proper rating of light bulbs are listed below : Headlight bulb : 6V-15/1 5W Stop/ta i 1 1 ig ht bulb : 6V -18 /6W...
  • Page 30 (2) Press the bulb socket (2) in and twist to the left, the bulb socket will disengage from the reflector (3) Headlight bulb (§) can be removed from the reflector. (4) The vertical and horizontal beam adjustment is made with beam adjuster ®...
  • Page 31 ■ Stop/taillight replacement procedure. (1) Remove the two screws retaining the stop/taillight lens. (2) Press the bulb in and twist to the left, the bulb can be removed. (3) Replace with a good bulb.
  • Page 32 • REMOVING THE WHEEL Tire replacement and also repair of puncture can be easily performed by removing the wheel from the motorcycle. ■ Front wheel Raise the front wheel off the ground by placing a stand under the engine. Disconnect the speedometer cable 0 and the front brake cable @ ;...
  • Page 33 wheel ■ Rear First, loosen the drive chain adjuster nuts ® , remove the rear axle nut (2) and then disconnect the chain by unfastening the drive chain clip. Remove the rear brake adjuster nuts and pull out the axle (3).
  • Page 34 ■ Drive chain installation Loosen the rear axle nut, allowing the ends of the drive chain to be connected with a joint clip. The joint clip © should be installed in the way that the open end will face in the direction opposite to rotation of the chain.
  • Page 35 • DRIVE CHAIN ADJUSTMENT The proper drive chain adjustment is 0 .4 ~ 0 .8 in (1 0 ~ 2 0 m m ) of slack in the chain when checked at a mid-point between the drive and driven sprockets on the lower loop of the chain. To make the chain adjustment, first loosen the rear axle nut on the left side and then turn the adjusting nuts ©...
  • Page 36 iw*59i .... After completing the adjustment, make sure that the rear wheel is in alignment by checking to see if the alignment mark on the drive chain adjusters on both th%|tight and left sides are in the same position in reference to the alignment m,grks (2) on the rear fork.
  • Page 37 The inspection and adjustments from following section require ex­ perience and special tools to perform, therefore, it is recommended that they be accomplished by your Honda service shop for best result. • VALVE TAPPET CLEARANCE AND ADJUSTMENT (1) Remove the valve tappet cover and flywheel cover.
  • Page 38 If it is necessary to make adjustment, loosen the adjusting screw lock nut © and turn the adjusting screw (3) so that the valve clearance will offer a slight resistance when the thickness gauge is inserted. After completing the adjustment, retighten the adjusting screw lock nut while holding the adjusting screw, to prevent turning.
  • Page 39 • IGNITION TIMING INSPECTION AND ADJUSTMENT (1) Remove the flywheel cover. (2) Revolve the flywheel in the counterclockwise direction and align the " F " mark (5) on the flywheel to the index mark © on the case. this time, ideally, the contact breaker point should just start to open. (3) If adjustment is necessary, loosen the contact breaker point screw...
  • Page 40 (g}# insert a screwdriver into the contact breaker plate slot © and make the adjustment by moving either to the right or left. (4) Upon completion of adjustment, retighten the contact breaker point screw and check to make sure that the contact breaker point gap at maximum opening is 0.012~0.016 in (0.3~0.4m m ).
  • Page 41 • CARBURETOR ADJUSTMENT Make the carburetor adjustment after the engine has attained operating temperature. First adjust the engine idle speed to approximately 1,500 rpm with the throttle stop screw © and then turn the air screw ( ) slowly back and forth to obtain the point of the highest engine rpm.
  • Page 42 ..r • SPARK PLUG CLEANING AND ADJUSTMENT (1) If spark plug electrode is dirt^Wwt ® | = l or covered with carbon deposits, proper ignition cannot be produced; resulting in abnormal engine op­ eration. Therefore, it is necessary to clean the spark plug and adjust • gap periodically.

  • Page 43: Wiring Diagram

    WIRING DIAGRAM HEADLIGHT CONTROL .SW ITCH ARRANGEMENT FLYWHEEL A.C. GENERATOR...

  • Page 44: Technical Data

    TECHNICAL DATA DIMENSION < >0\terall length 1755 mm (69.2 in) Overall width 600 mm (23.6 in) Overall he ght 1035 mm (40.7 in) Wheelbase 1130 mm (44.4 in) Min, ground clearance 140 mm (5.5 in) Steering angle 65° right and left from center Curb weight 50 kg (110.2 1b)
  • Page 45 • FRAME Suspension (F) Bottom link Suspension (R) Swinging arm Brakes Internal expansion Fuel tank capacity 3.0 lit. (0.8 U.S gal., 0.66 Imp. gal) Trail 60 mm (2.36 in) Caster 65° Tire size & pressure 2.00-19 2.0 kg/cm2 (28.4 lbs/in2 ^ Tire size &...
  • Page 46 • ENGINE Single cylinder, inclined 10°upfrom horizontal Cylinder layout Valve arrangement Overhead valve 42X 35.6 mm (1.654x1.401 in) Bore and stroke ^ Compression ratio ‘Displacement 49 cc (3.0 cu-in) Carburetor Side draft piston valve 0.75 lit, (1.6 U.S pt. 1.3 lmp-pt.) Oil capacity Lubrication Wet sump...
  • Page 47 • ELECTRICAL Ignition Flywheel magneto Spark plug NGK C-7HS Headlight 6 V-1 5/1 5 W Stop/taillight 6 V -1 8 /6 W v * /...
  • Page 48 O IAI 3 IAI...
  • Page 49 ■ *r~ > **■ ■ b O 1 A 1 3 1 A 1...
  • Page 51 O 1 A I 3 IAI...
  • Page 52 HONDA MOTOR CO., LTD. < H ) 5000803 PRINTED IN JAPAN...