2007 YAMAHA YFM80R maintenance

8-18
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tion chart.
NOTE:

A diagnostic tachometer is needed to make this
adjustment.
1. Start the engine and warm it up.
NOTE:

The engine is warm when it quickly responds to the
throttle.
2. Attach the tachometer to the spark plug lead.
3. Check the engine idling speed and, if neces-
sary, adjust it to specification by turning the
throttle stop screw at the carburetor. To in-
crease the engine idling speed, turn the throt-
tle stop screw in direction (a), and to decrease
it, turn the screw in direction (b).
NOTE:

If the specified idling speed cannot be obtained as
described above, have a Yamaha dealer make the
adjustment.
EBU27071
Checking the throttle cable free play
The throttle cable free play should be checked at
the intervals specified in the periodic maintenance
and lubrication chart.
1. Throttle stop screw
Engine idling speed:
1700–1900 r/min
1 (a) (b)

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The throttle cable free play should measure 1.0–
3.0 mm (0.04–0.12 in) at the throttle lever. Period-
ically check the throttle cable free play and, if nec-
essary, have a Yamaha dealer adjust it.
EBU24050
Timing chain
The timing chain stretches with use, resulting in im-
proper valve timing and engine noise. To prevent
this from occurring, the timing chain tensioner
must be adjusted by a Yamaha dealer at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
EBU24060
Valve clearance
The valve clearance changes with use, resulting in
improper air-fuel mixture and/or engine noise. To
prevent this from occurring, the valve clearance
must be adjusted by a Yamaha dealer at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
EBU24090
Checking the front and rear brake
shoes
The front and rear brake shoes must be checked
for wear at the intervals specified in the periodic
maintenance and lubrication chart. Each brake is
provided with a wear indicator, which allows you to
check the brake shoe wear without having to dis-
assemble the brake. To check the brake shoe
wear, check the position of the wear indicator while
applying the brake. If a brake shoe has worn to the
point that the wear indicator reaches the wear limit
line or mark, have a Yamaha dealer replace the
brake shoes as a set.
1. Throttle lever free play
1

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Front brake Rear brake

EBU24330
Adjusting the front brake lever free
play
The brake lever free play must be checked and, if
necessary, adjusted at the intervals specified in
the periodic maintenance and lubrication chart.NOTE:

Before adjusting the brake lever free play, check
the front brake shoes for wear.
The brake lever free play should measure 10.0–
1. Wear limit line
2. Wear indicator
1
2

1. Wear limit mark
2. Wear indicator
1
2

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6. Tighten the upper locknut.
WARNING

EWB02080
Operating with improperly serviced or adjust-
ed brakes could cause loss of braking ability,
which could lead to an accident.
After servicing:

Make sure the brakes operate smoothly and
that the free play is correct.

Make sure the brakes do not drag.
Replacement of brake components requires
professional knowledge. These procedures
should be performed by a Yamaha dealer.
EBU24473
Adjusting the rear brake lever and
brake pedal free play
The brake lever and brake pedal free play must be
checked and, if necessary, adjusted at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
NOTE:


Always perform this maintenance completely in
the following order whenever adjusting the rear
brake.

Before adjusting the brake lever and brake pedal
free play, check the rear brake shoes for wear.
Adjusting the brake lever free play
The brake lever free play should measure 5.0–8.0
mm (0.20–0.31 in) as shown. If the free play is in-
correct, adjust it as follows.
1. Cable joint
1

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EBU24930
Checking and lubricating the brake and
shift pedals
The operation of the brake and shift pedals should
be checked before each ride, and the pedal pivots
should be lubricated if necessary.
EBU24961
Checking the wheel bearings
The front and rear wheel bearings must be
checked at the intervals specified in the periodic
maintenance and lubrication chart. If there is play
in a wheel hub or if a wheel does not turn smoothly,
have a Yamaha dealer check the wheel bearings.
EBU25070
Lubricating the knuckle shafts
The knuckle shafts must be lubricated at the inter-
vals specified in the periodic maintenance and lu-
brication chart.Lubricate the knuckle shafts using a grease gun.
EBU25090
Lubricating the steering shaft
The steering shaft must be lubricated at the inter-
vals specified in the periodic maintenance and lu-
brication chart. Recommended lubricant:
Lithium-soap-based grease (all-purpose
grease)
Recommended lubricant:
Lithium-soap-based grease

1. Grease nipple
1

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Lubricate the steering shaft using a grease gun.
EBU25121
Battery
A poorly maintained battery will corrode and dis-
charge quickly. The electrolyte level, battery lead
connections and breather hose routing should be
checked before each ride and at the intervals
specified in the periodic maintenance and lubrica-
tion chart.
To check the electrolyte level
1. Place the ATV on a level surface.
2. Check the electrolyte level in the battery.
NOTE:

The electrolyte should be between the minimum
and maximum level marks.
3. If the electrolyte is at or below the minimum
level mark, add distilled water to raise it to the
maximum level mark. Recommended lubricant:
Lithium-soap-based grease
1. Grease nipple
1

1. Maximum level mark
2. Minimum level mark

1
2

O
Owner’s manual and tool kit............................................8-1
P
Parking ............................................................................6-5
Parking brake ..................................................................4-6
Parking on a slope ..........................................................6-6
Part locations ..................................................................3-1
Periodic maintenance and lubrication chart ....................8-3
Pre-operation check list ..................................................5-1
R
Riding your ATV ..............................................................7-1
S
Safety information ...........................................................1-1
Seat...............................................................................4-10
Shifting ............................................................................6-3
Shift pedal .......................................................................4-6
Spark arrester, cleaning ................................................8-16
Spark plug, checking.......................................................8-7
Specifications ................................................................10-1
Speed limiter and air intake restrictor plate.....................4-3
Start switch .....................................................................4-2
Steering shaft, lubricating .............................................8-27
Storage ...........................................................................9-2
T
Throttle cable free play, checking .................................8-18
Throttle lever ...........................................................4-2
,
5-4
Timing chain..................................................................8-19
Tire pressure, measuring ................................................5-5
Tires ................................................................................5-4
Tire wear limit..................................................................5-6
Troubleshooting ............................................................8-33Troubleshooting chart .................................................. 8-34
V
Valve clearance ........................................................... 8-19
Vehicle identification number ....................................... 11-1
W
Wheel bearings, checking ............................................ 8-27
Wheel, installing ........................................................... 8-32
Wheel, removing .......................................................... 8-31