Page 18 of 362

PERIODIC MAINTENANCE AND
ADJUSTMENT .........................................8-1
Owner’s manual and tool kit .................8-3
Periodic maintenance/Lubrication ........8-7
Engine oil ............................................8-13
Final transmission oil ..........................8-21
Spark plug inspection .........................8-27
Engine air filter element and V-belt
case air filter element cleaning .........8-31
Idle speed adjustment ........................8-43
Valve clearance adjustment ...............8-45
Throttle lever adjustment ....................8-45
Front and rear brake shoe
inspection .........................................8-47
Front brake lever free play
adjustment ........................................8-49
Rear brake adjustment .......................8-59
Drive chain slack check ......................8-61
Drive chain slack adjustment ..............8-63Lubricating and drive chain ................8-67
Draining the V-belt compartment ........8-69
Cable inspection and lubrication ........8-71
Brake lever lubrication ........................8-73
Knuckle shaft, lower arms and
steering shaft lubrication ..................8-73
Wheel removal ...................................8-75
Wheel installation ...............................8-75
Battery ................................................8-77
Replenishing a battery fluid ................8-81
Fuse replacement ...............................8-85
Replacing the headlight bulb ..............8-87
Tail/brake light bulb replacement .......8-91
Headlight beam adjustment ................8-93
Troubleshooting ..................................8-95
Troubleshooting chart .........................8-998
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8-85
EBU00389
Fuse replacement
1. The fuse block is located on the right side of
the machine.
2. If the fuse is blown, turn off the ignition
switch and install a new fuse of proper
amperage. Then turn on the ignition switch,
if the fuse immediately blows again, consult
a Yamaha dealer.
w
Always use a fuse of the specified rating.
Never use a material in place of the proper
fuse. An improper fuse can cause damage to
the electrical system which could lead to a
fire.
cC
To prevent accidental short-circuiting, turn
off the main switch when checking or replac-
ing a fuse.
qw
1. Fuse 2. Spare fuse1. Fusible 2. Fusible de rechange1. Fusible 2. Fusible de repuestoSpecified fuse: 15A
1C5-9-61-08 9/4/04 9:30 AM Page 8-86
Page 346 of 362
10-5
Model YFM125G
Shock absorber:
Front Coil spring/Oil damper
Rear Coil spring/Oil damper
Wheel travel:
Front 70 mm
Rear 80 mm
Electrical:
Ignition system DC. C.D.I.
Charging system A.C. Magneto
Battery type/voltage, capacity 12N12C-4A-2/12V, 12Ah
Headlight type: Bulb
Bulb volgate, wattage ×quantity:
Headlight 12V, 30 W/30 W ×2
Tail/brake light 12V, 5 W/21 W ×1
Indicator light:
Neutral 12V, 1.7 W ×1
Reverse 12V, 1.7 W ×1
Fuse: 15A
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