2009 YAMAHA YFM90R brake

7-20
RIDING DOWNHILL
When riding your ATV downhill, shift your weight
as far to the rear and uphill side of the ATV as pos-
sible. Move back on the seat and sit with your arms
straight. Allow the engine compression to do most
of the braking for you. Improper braking may cause
a loss of traction.
Use caution while descending a hill with loose or
slippery surfaces. Braking ability and traction may
be adversely affected by these surfaces. Improper
braking may also cause a loss of traction.
Whenever possible, ride your ATV straight down-
7
WARNING
Maintain a steady speed when climbing a hill.
If you lose all forward speed:Keep weight uphill.Apply the brakes.Lock the parking brake after you are
stopped.
If you begin rolling backwards:Keep weight uphill.Never apply the rear brake while rolling
backwards. Apply the front brake.When fully stopped, apply the rear brake as
well, and then lock the parking brake.
Dismount on uphill side or to a side if pointed
straight uphill. Turn the ATV around and re-
mount, following the procedure described inthe Owner’s Manual.

7-23
carefully. Enter where there is no sharp drop off,
and avoid rocks or other obstacles which may be
slippery or upset the ATV. Drive slowly and care-
fully.Test your brakes after leaving the water. Do not
continue to ride your ATV without verifying that you
have regained proper braking ability.
7
WARNING
Never operate this ATV in fast flowing water or
in water deeper than that specified in your
Ow ner’ s Manual. Remember that wet brakes
may have reduced stopping ability. Test your
brakes after leaving water. If necessary, apply
them several times to let friction dry out the lin-
ings. If the ATV is operated through deep or
fast flowing water, the tires may float, causing
loss of traction and loss of control, whichcould lead to an accident.

7-25
SLIDING AND SKIDDING
Care should be used when riding on loose or slip-
pery surfaces since the ATV may slide. If unex-
pected and uncorrected, sliding could lead to an
accident.
To reduce the tendency for the front wheels to slide
in loose or slippery conditions, positioning your
weight over the front wheels will sometimes help. If the rear wheels of your ATV start to slide side-
ways, control can usually be regained (if there is
room to do so) by steering in the direction of the
slide. Applying the brakes or accelerating is not
recommended until you have corrected the slide.
7
WARNING
Before operating in a new area, check for ob-
stacles. Never attempt to ride over large obsta-
cles, such as large rocks or fallen trees. When
you go over obstacles, always follow proper
procedures as described in the Owner ’s Manu-al.

7-27
Lean more into the turn to regain balance. If nec-
essary, gradually let off the throttle and/or steer
to the outside of the turn. (See page 7-15.)If your ATV starts to slide sideways:
Steer in the direction of the slide if you have the
room. Applying the brakes or accelerating is not
recommended until you have corrected the
slide. (See page 7-25.)If your ATV can’t make it up a hill you are trying
to climb:
Turn the ATV around if you still have forward
speed. If not, stop, dismount on the uphill side of
the ATV and physically turn the ATV around. If
the ATV starts to slip backwards, DO NOT USE
THE REAR BRAKE – the ATV may tip over on
top of you. Instead, apply the front brake or dis-
mount the ATV on the uphill side. (See
page 7-17.)If your ATV is traversing a sloping surface:
Be sure to ride with your weight positioned to-
wards the uphill side of the ATV to maintain
proper balance. If the ATV starts to tip, steer
down the hill (if there are no obstacles in your
way) to regain balance. If you discover that the
ATV is going to tip over, dismount on the uphill
side. (See page 7-21.)
If your ATV encounters shallow water:
Ride slowly and carefully through slow moving
water, watching for obstacles. Be sure to let wa-
ter drain from the ATV and CHECK YOUR
BRAKES FOR PROPER OPERATION when
you come out of the water. Do not continue to
ride your ATV until you have regained adequate
braking ability. (See page 7-22.)
7

8-5
General maintenance and lubrication chart NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes rst month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 3201 *Timing chain
Check chain tension.Adjust if necessary. √
√ √ √
2 Air lter elementClean and replace if necessary. Every 20–40 hours (more often in wet or
dusty areas)
4 *Front brakeCheck operation and correct if necessary.Check brake lever free play and adjust if neces-
sary. √ √ √ √ √Replace brake shoes.
Whenever worn to the limit
7
*Wheels
Check runout and for damage, and replace if nec-
essary. √
√ √ √
8 *TiresCheck tread depth and for damage, and replace if
necessary.Check air pressure and balance, and correct if
necessary. √
√ √ √
8
5
*Rear brake
Check operation and correct if necessary.Check uid level and ATV for uid leakage, and
correct if necessary. √ √ √ √ √Replace brake pads.
Whenever worn to the limit
6 *Brake hosesCheck for cracks or other damage, and replace if
necessary. √ √ √ √Replace.
Every 4 years
3
*Clutch
Check operation.
√√ √ √

8-7
8
NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes first month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 32019 *Drive select lever
safety system cable • Check operation and adjust or replace if neces-
sary. √ √ √
20 *Throttle lever hous-
ing and cable • Check operation and correct if necessary.
• Check throttle cable free play and adjust if neces-
sary.
• Lubricate throttle lever housing and cable. √ √ √ √ √
21 *Front and rear brake
switches • Check operation and correct if necessary.
√ √ √ √ √
22 *Lights and switches • Check operation and correct if necessary.
• Adjust headlight beams.
√ √ √ √ √
√ √ √
23
* V-belt
Check operation
√Check for wear, cracks or other damage, and replace
if necessary.

8-8
TIP
8
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
Hydraulic brake service Regularly check and, if necessary, correct the brake fluid level.Every two years replace the internal components of the brake master cylinder and caliper, and
change the brake fluid. Replace the brake hoses every four years and if cracked or damaged.

8-22
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. Timing chainThe 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.
Valve clearanceThe 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.
1. Throttle lever free play
1
BrakesReplacement of brake components requires
professional knowledge.Brake service should be
performed by a Yamaha dealer.
WARNING
Operating with improperly serviced or adjusted
brakes could lead to a loss
in braking ability
and an accident.
8
Checking the front brake shoesThe front brake shoes must be checked for wear at
the intervals specified in the periodic maintenance
and lubrication chart. Front brake is provided with a
wear indicator on front brake lever, which allows you