Table of Contents
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Table of Contents
Related Manuals for Yamaha YFM125S
Summary of Contents for Yamaha YFM125S
- Page 1 YFM125S 3FA-AE2 SUPPLEMENTARY SERVICE MANUAL...
- Page 3 FOREWORD This Supplementary Service Manual has been prepared to introduce new service and data for the YFM125S. For complete service information procedures it is necessary to use this Supplementary Service Manual together with the following manual. YFA1W SERVICE MANUAL: 3FA-ME1...
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Page 4: Important Information
EBS00002 NOTICE This manual was produced by the Yamaha Motor Company primarily for use by Yamaha dealers and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one manual, so it is assumed that anyone who uses this book to perform maintenance and repairs on Yamaha machine has a basic understanding of the mechanical ideas and the procedures of machine repair. -
Page 5: How To Use This Manual
EBS00004 HOW TO USE THIS MANUAL MANUAL ORGANIZATION This manual consists of chapters for the main categories of subjects. (See “symbols”) 1st title 1: This is the title of the chapter with its symbol in the upper right corner of each page. 2nd title 2: This title indicates the section of the chapter and only appears on the first page of each section. - Page 6 EB003000 ILLUSTRATED SYMBOLS Illustrated symbols 1 to 8 are printed on the SPEC top right of each page and indicate the subject INFO of each chapter. 1 General information 2 Specifications 3 Periodic checks and adjustments 4 Engine 5 Carburetion 6 Chassis 7 Electrical 8 Troubleshooting...
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Page 7: Table Of Contents
REPLACING A HEADLIGHT BULB ............22 ELECTRICAL ....................24 IGNITION SYSTEM .................24 CIRCUIT DIAGRAM ................24 CHARGING SYSTEM ................25 CIRCUIT DIAGRAM ................25 LIGHTING SYSTEM ................26 CIRCUIT DIAGRAM ................26 TROUBLESHOOTING ................27 SIGNAL SYSTEM ...................29 CIRCUIT DIAGRAM ................29 CHECKING THE SIGNALING SYSTEM ..........30 YFM125S WIRING DIAGRAM... -
Page 9: Specifications
SPEC GENERAL SPECIFICATIONS SPECIFICATIONS GENERAL SPECIFICATIONS Model YFM125S Model code number 1C51: (for Oceania) 1C53: (for CDN) 1C54: (for Europe) Dimensions Overall length 1,710 mm (67.3 in) Overall width 990 mm (39.0 in) Overall height 980 mm (38.6 in) Seat height 705 mm (27.8 in) -
Page 10: Maintenance Specifications
SPEC MAINTENANCE SPECIFICATIONS MAINTENANCE SPECIFICATIONS ENGINE Model YFM125S Carburetor I.D. mark 5VJ2 10 Main jet (M.J) # 77.5 Main air jet (M.A.J) ø 1.3 Jet needle (J.N) 4HPY46-1 Needle jet (N.J) O-1M Cutaway (C.A) Pilot air jet (P.A.J) # 130 Pilot outlet (P.O) -
Page 11: Electrical
SPEC MAINTENANCE SPECIFICATIONS ELECTRICAL Model YFM125S C.D.I. Magneto model/manufacturer F1C5/YAMAHA 248 ~ 372 Ω at 20 °C (68 °F) Pickup coil resistance (lead color) (white-red) C.D.I. unit model/manufacturer 3FA/YAMAHA Charging system Type A.C. magneto generator Magneto model/manufacturer F1C5/YAMAHA 0.8 ~ 1.2 Ω at 20 °C (68 °F) -
Page 12: Cable Routing
SPEC CABLE ROUTING CABLE ROUTING 1 Rear brake switch lead 0 Headlight lead (right) 2 Rear brake cable A Neutral/reverse indicator light lead 3 Front brake cable B Main switch lead 4 Front brake switch lead C Coupler cover 5 Throttle cable D Steering shaft 6 Fuel tank breather hose 7 Horn switch lead (for Europe) - Page 13 SPEC CABLE ROUTING È Fasten the front brake switch lead with two plas- Í Pass the leads and wire harness through the tic bands. guides on the front fender as shown. É Fasten the rear brake switch lead and handlebar switch lead with two plastic bands.
- Page 14 SPEC CABLE ROUTING 1 Front brake cable È Pass the front brake cable and rear brake cable 2 Throttle cable through the cable guide. (for CDN and Oceania) 3 Rear brake cable Pass the front brake cable, rear brake cable, and 4 Rear brake switch lead horn switch lead through the cable guide.
- Page 15 SPEC CABLE ROUTING Ë Cross the front brake cables behind the steering shaft. Route the right front brake cable in front of the left front brake cable. Ì Put the cover on the couplers, and then fasten a plastic band around the middle of the cover. Í...
- Page 16 SPEC CABLE ROUTING 1 Transmission case breather hose È Fasten the wire harness, starter motor lead, and 2 Throttle cable transmission case breather hose to the frame 3 Front brake cable with a plastic band. 4 Main switch lead É Route the wire harness, starter motor lead, and 5 Wire harness the transmission case breather hose under the 6 Rectifier/regulator...
- Page 17 SPEC CABLE ROUTING Ê Fasten the wire harness, starter motor lead, and Ì Face the end of the transmission case breather transmission case breather hose to the frame hose down. Í Fasten the wire harness, starter motor lead, and with a plastic band. Be sure not to pinch the transmission case breather hose.
- Page 18 SPEC CABLE ROUTING Ï 80 mm (3.15 in) Ô Face the end of the plastic band inward. (for Ð Fasten the starter motor lead and A.C. magneto Europe) lead to the frame with a plastic band. The end of the plastic band should be toward the rear of the vehicle, facing inward.
- Page 19 SPEC CABLE ROUTING 1 Tail/brake light B Starter motor lead 2 Tail/brake light lead C Battery breather hose 3 Reverse relay D Fuse holder 4 Starting circuit cut-off relay 5 Starter relay 6 Positive battery lead 7 Negative battery lead 8 Transmission case breather hose 9 Reverse switch 0 Neutral switch lead...
- Page 20 SPEC CABLE ROUTING È Fasten the tail/brake light lead to the rear carrier Î Install both the holder and the negative battery with a plastic band. lead terminal to the crankcase with the screw so É Pass the positive battery lead through the rear that the holder is in front of the terminal.
- Page 21 SPEC CABLE ROUTING Ñ Pass the battery breather hose through the Õ Do not straighten the negative battery lead ter- guide. minal. The negative battery lead should be bent Ò Route the battery breather hose so that there is as shown. no slack.
- Page 22 SPEC CABLE ROUTING 1 C.D.I. unit È Route the rear brake cable to the outside of the 2 Air duct inlet hose frame. 3 Air duct outlet hose É Place the end of the fuel tank breather hose in 4 Fuel tank breather hose the rubber fuel overflow tray.
- Page 23 SPEC CABLE ROUTING 1 C.D.I. unit B Starting circuit cut-off relay 2 Throttle cable C Reverse relay 3 Starter motor lead D Fuse holder 4 Wire harness 5 Transmission case breather hose 6 Ignition coil 7 Negative battery leads 8 Positive battery lead 9 Air vent hose 0 Crankcase breather hose A Starter cable...
- Page 24 SPEC CABLE ROUTING È Route the C.D.I. unit lead over the front shock Í Pass the crankcase breather hose between the absorber bracket. starter cable and throttle cable. É Route the negative battery leads under the Î Route the starter cable over the crankcase frame.
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Page 25: Periodic Checks And Adjustments
SEAT, CARRIERS AND FENDERS PERIODIC CHECKS AND ADJUSTMENTS SEAT, CARRIERS AND FENDERS SEAT, FRONT CARRIER, FRONT BUMPER AND CENTER COVER 10 Nm (1.0 m kg, 7.2 ft • • 7 Nm (0.7 m kg, 5.1 ft • • 23 Nm (2.3 m kg, 17 ft •... - Page 26 SEAT, CARRIERS AND FENDERS 10 Nm (1.0 m kg, 7.2 ft • • 7 Nm (0.7 m kg, 5.1 ft • • 23 Nm (2.3 m kg, 17 ft • • 7 Nm (0.7 m kg, 5.1 ft • • 23 Nm (2.3 m kg, 17 ft •...
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Page 27: Front Grill Assembly And Front Fender
SEAT, CARRIERS AND FENDERS FRONT GRILL ASSEMBLY AND FRONT FENDER 7 Nm (0.7 m kg, 5.1 ft 7 Nm (0.7 m kg, 5.1 ft • • • • Order Job/Part Q’ty Remarks Removing the front grill assembly Remove the parts in the order listed. and front fender Seat/center cover Refer to “SEAT, FRONT CARRIER,... -
Page 28: Rear Carrier And Rear Fender
SEAT, CARRIERS AND FENDERS REAR CARRIER AND REAR FENDER 23 Nm (2.3 m kg, 17 ft • • 23 Nm (2.3 m kg, 17 ft • • Order Job/Part Q’ty Remarks Removing the rear carrier and rear Remove the parts in the order listed. fender Seat/center cover Refer to “SEAT, FRONT CARRIER,... - Page 29 SEAT, CARRIERS AND FENDERS 23 Nm (2.3 m kg, 17 ft • • 23 Nm (2.3 m kg, 17 ft • • Order Job/Part Q’ty Remarks Battery Carburetor joint clamp screw Loosen. Crankcase breather hose Disconnect. Air filter case Rear fender For installation, reverse the removal pro- cedure.
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Page 30: Electrical
ADJUSTING THE HEADLIGHT BEAMS/ REPLACING A HEADLIGHT BULB ELECTRICAL EBS00122 ADJUSTING THE HEADLIGHT BEAMS 1. Adjust: • headlight beam (vertically) M MMM M MMM M MMM M MMM M MMM a. Turn the adjusting screw 1 in direction a or b. Headlight beam is Direction a raised. - Page 31 REPLACING A HEADLIGHT BULB 3. Remove: • bulb holder 1 • bulb NOTE: Push the headlight bulb holder inward, turn it counterclockwise and remove the defective bulb. WARNING Keep flammable products and your hands away from the bulb while it is on, since it will be hot.
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Page 32: Electrical
– ELEC IGNITION SYSTEM ELECTRICAL EBS00503 IGNITION SYSTEM CIRCUIT DIAGRAM 1 A.C. magneto 3 Main switch 4 Fuse 5 Battery 9 C.D.I. unit 0 Ignition coil A Spark plug E Reverse switch G Brake lever switch L Engine stop switch –... -
Page 33: Charging System
– ELEC CHARGING SYSTEM EBS00516 CHARGING SYSTEM CIRCUIT DIAGRAM 1 A.C. magneto 2 Rectifier/regulator 4 Fuse 5 Battery – 25 –... -
Page 34: Lighting System
– ELEC LIGHTING SYSTEM EBS00518 LIGHTING SYSTEM CIRCUIT DIAGRAM 3 Main switch 4 Fuse 5 Battery I Tail/brake light K Light switch N Headlight – 26 –... -
Page 35: Troubleshooting
– ELEC LIGHTING SYSTEM EBS01067 EBS01044 TROUBLESHOOTING 2. Battery Any of the following fail to light: head- • Check the condition of the battery. light or tail/brake light. Refer to “BATTERY INSPECTION” in chapter 3 (Manual No.: 3FA-ME1). Check: 1. fuse Minimum open-circuit voltage 2. - Page 36 – ELEC LIGHTING SYSTEM EBS01069 5. Wiring • Check the entire lighting system’s wiring. Refer to “WIRING DIAGRAM”. • Is the lighting system’s wiring properly connected and without defects? Check the condition Properly connect or of each of the lighting repair lighting system’s circuits.
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Page 37: Signal System
– ELEC SIGNAL SYSTEM EB806000 SIGNAL SYSTEM CIRCUIT DIAGRAM 3 Main switch 4 Fuse 5 Battery G Brake lever switch H Front brake light switch I Tail/brake light O Horn switch P Horn È For Europe – 29 –... -
Page 38: Checking The Signaling System
– ELEC SIGNAL SYSTEM CHECKING THE SIGNALING SYSTEM 3. Horn 1. The horn fails to sound. (for Europe) • Disconnect the black connector at the horn 1. Horn switch terminal. • Connect a jumper lead 1 to the horn ter- •... - Page 40 YAMAHA MOTOR CO., LTD. 2500 SHINGAI IWATA SHIZUOKA JAPAN...
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Page 41: Yfm125S Wiring Diagram
YFM125S WIRING DIAGRAM 1 A.C. magneto 2 Rectifier/regulator R/B B O G/Y 3 Main switch W G/W 4 Fuse (BLACK) 5 Battery (BLACK) 6 Starter relay 7 Starter motor 8 Starting circuit cut-off relay 9 C.D.I. unit 0 Ignition coil...