Yamaha YFM660 01 User Manual

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ADJUSTING THE REAR SHOCK 
ABSORBER
1.Adjust:

Spring preload
***********************************************
Adjustment steps:

Elevate the rear wheels by placing a suitable
stand under the frame.

Loosen the locknut 1
.

Turn the adjusting ring 2
 in direction a
 or
b
.
NOTE:

Be sure to remove all dirt and mud from
around the locknut and adjusting ring before
adjustment.

The length of the spring (installed) changes
1.5 mm (0.06 in) per turn of the adjuster.
CAUTION:
Never attempt to...

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2.Adjust:

Rebound damping force
***********************************************
Adjustment steps:

Turn the adjusting screw 1
 in direction a
 or
b
.
CAUTION:
Do not force the adjuster past the minimum
or maximum extent of adjustment. The
adjuster may be damaged.
***********************************************
Direction a Rebound damping force 
is increased.
Direction b Rebound damping force 
is decreased.
From the fully turned-in position:
Standard: 10 clicks out
Minimum: 20 clicks out...

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CHK
ADJADJUSTING THE REAR SHOCK ABSORBER/
CHECKING THE TIRE
CAUTION:
Do not forc the adjuster past the minimum
or maximum extent of adjustment. The
adjuster may be damaged.
***********************************************
CHECKING THE TIRE
WARNING
This model is equipped with low pressure
tires. It is important that they be inflated cor-
rectly and maintained at the proper pressures.

TIRE CHARACTERISTICS
1)Tire characteristics influence the handling
of ATV’s. The tires listed below have been...

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CHECKING THE TIRE

MAXIMUM LOADING LIMIT
1)Vehicle load limit (total weight of cargo, 
rider and accessories, and tongue 
weight): 100 kg (220 lb)
1.Measure:

Tire pressure (cold tire pressure)
Out of specification →
 Adjust.
NOTE:

The low-pressure tire gauge 1
 is included
as standard equipment.

If dust or the like is stuck to this gauge, it will
not provide the correct readings. Therefore,
take two measurements of the tire’s pressure
and use the second reading.
WARNING
Uneven or...

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ADJCHECKING THE TIRE/CHECKING THE WHEEL/
CHECKING AND LUBRICATING THE CABLE
2.Check:

Tire surfaces
Wear/damage →
 Replace.
WARNING
It is dangerous to ride with a worn-out tire.
When tire wear is out of specification,
replace the tire immediately.
Tire wear limit a:
Front and rear: 3.0 mm (0.12 in)
CHECKING THE WHEEL
1.Check:

Wheels 1
 
Damage/bends →
 Replace.
NOTE:
Always balance the wheel when a tire or wheel
has been changed or replaced.
WARNING

Never attempt even small repairs to the...

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CHK
ADJCHECKING AND LUBRICATING THE CABLE/
LUBRICATING THE LEVERS AND PEDAL
1.Check:

Cable sheath 
Damage →
 Replace.
2.Check:

Cable operation
Unsmooth operation →
 Lubricate or replace.
NOTE:
Hold the cable end up and apply several drops
of lubricant to the cable.
3.Apply:

Lithium soap base grease
(onto end of the cable)
Recommended lubricant:
Yamaha chain and cable lube or
Engine oil
LUBRICATING THE LEVERS AND PEDAL
1.Lubricate the pivoting parts.
Recommended lubricant:
Lithium soap base grease 

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CHECKING THE BATTERY
EB305000
ELECTRICAL
CHECKING THE BATTERY
NOTE:
Since the MF battery is a sealed type battery, it
is not possible to measure the specific gravity
of the electrolyte in order to check the charge
state of the battery. Therefore the charge of
the battery has to be checked by measuring
the voltage at the battery terminals.
CAUTION:
CHARGING METHOD

This is a sealed type battery. Never
remove the sealing caps. If the sealing
caps have been removed, the balance will
not be...

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CHECKING THE BATTERY
Batteries generate explosive hydrogen gas.
Always follow these preventive measures:

Charge batteries in a well-ventilated area.

Keep batteries away from fire, sparks or
open flames (e.g., welding equipment,
lighted cigarettes, etc.).

DO NOT SMOKE when charging or han-
dling batteries.
KEEP BATTERIES AND ELECTROLYTE
OUT OF REACH OF CHILDREN.
1.Remove:

Seat

Battery holding bracket
Refer to “SEAT, FENDERS AND FUEL
TANK”.
2.Disconnect:

Battery leads
CAUTION:
First...

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Check the condition of the battery using the
following charts.
Example:

Open-circuit voltage = 12.0 V

Charging time = 6.5 hours

Charge condition of the battery = 20 ~ 30%

Charging method for MF batteries
CAUTION:

If it is impossible to set the standard
charging current, be careful not to over-
charge.

When charging the battery, be sure to
remove it from the motorcycle. (If charg-
ing has to be done with the battery
mounted on the motorcycle, be sure to
disconnect the wire at the...

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CHECKING THE BATTERY
Charging method using a variable voltage charger