Page 390 of 444
8-121
EBU00385
Battery maintenance
1. When the machine is not used for a month or
longer, remove the battery and store it in a
cool, dark place. Completely recharge the
battery before reinstallation.CAUTION:
A special battery charger (constant voltage/
ampere or constant voltage) is required for re-
charging a sealed-type battery. Using a con-
ventional battery charger may shorten the
battery life.2. Always make sure the connections are cor-
rect when putting the battery back in the ma-
chine.
EE.book Page 121 Tuesday, April 1, 2003 12:23 PM
Page 404 of 444

8-135
EBU00724Troubleshooting chart
Starting problems or poor engine performance1. Fuel
Check if there is fuel
in the fuel tank.There is fuel.Turn the fuel cock
lever to “OFF”.No fuel.Fuel cock is
clogged.
Clean the
fuel cock. Some fuel.Turn the fuel cock
lever to “RES”.Restart the engine.
No fuel.Supply fuel.
2. Compression
Use the electric
starter to see if
there is compression.There is compression.
Compression normal.
No compression.Ask a Yamaha dealer to
inspect.
3. Ignition
Remove the
spark plug and
check electrodes.WetWipe clean with dry cloth.
DryAttach spark plug cap and
ground to chassis.Use the
electric starter.Spark is good.Ignition system is
normal.
Spark is weak.
Adjust the spark plug gap
or replace the spark plug. No spark.
Ask a Yamaha dealer to
inspect. 4. Battery
Use the electric starter.Engine turns over
quickly.Battery is good.
Engine turns over
slowly.Check the connections.Check the
fuel flow.
Turn the fuel cock
lever to “ON”.
Remove the fuel hose
from the fuel cock.
EE.book Page 135 Tuesday, April 1, 2003 12:23 PM
Page 418 of 444
9-9
5. Tie a plastic bag over the exhaust pipe outlet
to prevent moisture from entering.
6. If storing in a humid or salt-air atmosphere,
coat all exposed metal surfaces with a light
film of oil. Do not apply oil to any rubber parts
or the seat cover.
7. Remove the battery and charge it. Store it in
a dry place and recharge it once a month. Do
not store the battery in an excessively warm
or cold place (less than 0°C or more than
30°C).NOTE:Make any necessary repairs before storing the
machine.
EE.book Page 9 Tuesday, April 1, 2003 12:23 PM
Page 424 of 444
10-5
Tire:
Type Tubeless
Size (front) AT25
× 8-12
(rear) AT25 ×10 - 12
Brake:
Front brake type Dual disc brake
operation Right hand operation
Rear brake type Single disc brake
operation Left hand and right foot operation
Suspension:
Front suspension Double wishbone
Rear suspension Double wishbone
Shock absorber:
Front shock absorber Coil spring / Oil damper
Rear shock absorber Coil spring / Oil damper
Wheel travel:
Front wheel travel 170 mm
Rear wheel travel 225 mm
Electrical:
Ignition system DC. C.D.I.
Generator system A.C. magneto
Battery type YTX20L-BS
Battery capacity 12 V, 18 AhModel YFM660F
EE.book Page 5 Tuesday, April 1, 2003 12:23 PM