YAMAHA YZ85 2018 Service Manual

Operation and important ri din g points
6-1
6
EAU15952
Read the Owner’s Manual carefully to
become familiar with all controls. If
there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWA10272
Failure to familiarize yourself with
the controls can lead to loss of con-
trol, which coul d cause an acci dent
or injury.
EAU41308
Startin g an d warmin g up a
col d en gine
1. Turn the fuel cock lever to “ON”.
2. Shift the transmission into the
neutral position.
3. Turn the starter (choke) on and completely close the throttle. (See
page 4-7.)
4. Start the engine by pushing the kickstarter lever down.
5. When the engine is warm, turn the starter (choke) off.
TIP
The engine is warm when it responds
quickly to the throttle with the starter
(choke) turned off.
NOTICE
ECA11043
For maximum en gine life, never ac-
celerate har d when the en gine is
col d!
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Operation and important rid ing points
6-2
6
EAU16661
Startin g a warm en gine
Follow the same procedure as for
starting a cold engine with the excep-
tion that the starter (choke) is not re-
quired when the engine is warm.
Instead, start the engine with the throt-
tle slightly open.
TIP
If the engine does not start after sever-
al kicks, try again with the throttle 1/4
to 1/2 open.
EAU16673
Shiftin g
Shifting gears lets you control the
amount of engine power available for
starting off, accelerating, climbing hills,
etc.
The gear positions are shown in the il-
lustration.
TIP
To shift the transmission into the neu-
tral position, press the shift pedal down
repeatedly until it reaches the end of its
travel, and then slightly raise it.
NOTICE
ECA10261
Even with the transmission in
the neutral position, d o not
coast for lon g period s of time
with the en gine off, an d d o not
tow the motorcycle for lon g d is-
tances. The transmission is
properly lu bricated only when
the en gine is runnin g. Ina de-
quate lu brication may damag e
the transmission.
 Always use the clutch while
chan gin g g ears to avoi d d am-
a g in g the en gine, transmission,
1. Shift pedal
2. Neutral position
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Operation and important ri din g points
6-3
6
an
d d rive train, which are not
d esi gne d to withstan d the
shock of force d shifting .
EAU16691To start out an d accelerate
1. Pull the clutch lever to disengage the clutch.
2. Shift the transmission into first gear.
3. Open the throttle gradually and si- multaneously release the clutch
lever slowly.
4. Once the motorcycle has reached a speed high enough to change
gears, close the throttle, and at the
same time, quickly pull the clutch
lever in.
5. Shift the transmission into second gear. (Make sure not to shift the
transmission into the neutral posi-
tion.)
6. Open the throttle halfway and gradually release the clutch lever.
7. Follow the same procedure when
shifting to the next gear.
EAU16711To decelerate
1. Close the throttle and apply both the front and the rear brakes to
slow the motorcycle.
2. Downshift through the gears and shift the transmission into the neu-
tral position when the motorcycle
is almost completely stopped.
EAU41505
Engine break-in
WARNING
EWA10322
Failure to properly maintain the vehi-
cle or performin g maintenance ac-
tivities incorrectly may increase
your risk of injury or death durin g
service or while usin g the vehicle. If
you are not familiar with vehicle ser-
vice, have a Yamaha d ealer perform
service.
1. Before starting the engine, fill the fuel tank with a break-in oil-fuel
mixture as follows.
2. Start and warm up the engine. Check the operation of the con-
trols and the engine stop switch.
(See page 4-1.)
3. Operate the motorcycle in the low- er gears at moderate throttle
openings for five to eight minutes.
Stop the engine and check the
spark plug condition (see page
7-6); it will show a rich condition
during break-in.
4. Allow the engine to cool. Restart the engine and operate the motor-
cycle as in the step above for five
minutes. Then, very briefly shift to
the higher gears and check the
full-throttle response. Stop the en-
gine and check the spark plug.
5. After again allowing the engine to cool, restart and run the motorcy-
cle for five more minutes. Full
throttle and the higher gears may
Recommen ded 2-stroke en gine oil:
See page 9-1.
Mixin g ratio ( gasoline to oil):
15:1
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Operation and important rid ing points
6-4
6 be used, but sustained full-throttle
operation should be avoided.
Stop the engine and check the
spark plug again.
6. Allow the engine to cool, remove the cylinder head and cylinder,
and inspect the piston and cylin-
der. Remove any high spots on
the piston with #600-grit wet
sandpaper. Clean all components
and carefully reassemble the cyl-
inder head and cylinder.
7. Drain the break-in oil-fuel mixture from the fuel tank and refill with
the specified mix. (See page 4-4.)
8. Start the engine and check the op- eration of the motorcycle through-
out its entire operating range.
Stop the engine and check the
spark plug condition. Restart the
motorcycle and ride it for about 10
to 15 more minutes. The motorcy-
cle will now be ready to ride nor-
mally.
After the engine break-in period, thor-
oughly check the motorcycle for loose
parts, oil leakage and any other prob-
lems. Be sure to inspect and make ad-
justments thoroughly, especially cable
and drive chain slack and loose
spokes. In addition, check all fittings
and fasteners for looseness, and tight-
en if necessary.
NOTICE
ECA15561
 When any of the following parts
have been replaced , they must
b e broken in.
Cylin der or crankshaft:
A bout one hour of b reak-in op-
eration is necessary. Piston, rin
gs or transmission
g ears:
These parts require a bout 30
minutes of b reak-in operation at
half-throttle or less. O bserve the
con dition of the en gine carefully
d urin g operation.
 If any en gine trou ble shoul d oc-
cur durin g the en gine break-in
perio d, imme diately have a
Yamaha dealer check the vehi-
cle.
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Operation and important ri din g points
6-5
6
EAU17192
Parkin g
When parking, stop the engine, and
then turn the fuel cock lever to “OFF”.
WARNING
EWA10312
Since the en gine an d exhaust
system can become very hot,
park in a place where ped estri-
ans or chil dren are not likely to
touch them and b e burne d.
 Do not park on a slope or on soft
groun d, otherwise the vehicle
may overturn, increasin g the
risk of a fuel leak an d fire.
 Do not park near g rass or other
flammab le materials which
mi ght catch fire.
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Periodic maintenance an d a djustment
7-1
7
EAU42074
Periodic inspection, adjustment, and
lubrication will keep your vehicle in the
safest and most efficient condition
possible. Safety is an obligation of the
vehicle owner/operator. The most im-
portant points of vehicle inspection,
adjustment, and lubrication are ex-
plained on the following pages.
The intervals given in the periodic
maintenance and lubrication chart
should be simply considered as a gen-
eral guide under normal riding condi-
tions. However, depending on the
weather, terrain, geographical location,
and individual use, the maintenance in-
tervals may need to be shortened.
WARNING
EWA10322
Failure to properly maintain the vehi-
cle or performin g maintenance ac-
tivities incorrectly may increase
your risk of injury or d eath durin g
service or while usin g the vehicle. If
you are not familiar with vehicle ser-
vice, have a Yamaha d ealer perform
service.
WARNING
EWA15123
Turn off the en gine when performin g
maintenance unless otherwise
specified .
 A runnin g en gine has movin g
parts that can catch on body
parts or clothin g an d electrical
parts that can cause shocks or
fires.
 Runnin g the en gine while ser-
vicin g can lead to eye injury,
b urns, fire, or car bon monoxi de
poisonin g – possi bly lea din g to d
eath. See pag e 2-2 for more in-
formation a bout car bon monox-
i d e.
WARNING
EWA15461
Brake discs, calipers, drums, an d
linin gs can b ecome very hot during
use. To avoi d possi ble burns, let
b rake components cool before
touchin g them.
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Periodic maintenance an d a djustment
7-2
7
EAU66350
Perio dic maintenance an d lu brication chart
The following chart is intended as a general guide to maintenance and lubrication.
Bear in mind that such factors as weather, terrain, geographical location, and in-
dividual usage will alter the required maintenance and lubrication intervals. If you
are in doubt as to what intervals to follow in maintaining and lubricating your mo-
torcycle, consult your Yamaha dealer.
TIP
Items marked with an asterisk should be performed by a Yamaha dealer as they
require special tools, data and technical skills.
NO. ITEM ROUTINEAfter
break-in
Everyrace
Every
third race
Every
fifth race
As
required
1 *Piston Check piston for carbon deposits and
cracks or damage.√√ Clean.
Replace.
√√
2 *
Piston rings Check piston ring end gap and rings
for damage.√√
Replace.√√
3 *
Piston pin and small
end bearing Check piston pin and small end
bearing for damage.√
Replace.√
4 *
Cylinder head Check cylinder head for carbon
deposits.
√√ Clean.
Check cylinder head gasket for damage.
√√ Tighten cylinder head nuts if necessary.
Replace cylinder head gasket.
√
5 *
Cylinder Check cylinder for score marks or
wear.√√ Clean.
Replace.
√
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Periodic maintenance an d a djustment
7-3
7
9 *Rotor nut
(flywheel magneto) Tighten.√√
10 *
Kickstarter system Check idle gear for damage.√ Replace if necessary.
Check exhaust pipe and muffler for
carbon deposits.
√√
11 *Exhaust system
Clean.
√ Check crankshaft for carbon deposits and damage.12 *Crankshaft
Clean.
√ √
√
√
13 *
Carburetor Check carburetor settings and for
obstructions.√√
Adjust and clean.√√ Check condition.√√
14Spark plug Clean and regap.
Replace.
√ Check chain slack, alignment and
condition.
15 *Drive chain Adjust and thoroughly lubricate chain
with Yamaha chain and cable lube or
equivalent.√√
Replace.√
NO. ITEM ROUTINE
After
break-in
Everyrace
Every
third race
Every
fifth race
As
required
6 *Clutch Check clutch housing, friction plates,
clutch plates and clutch springs for
wear or damage.√√
Adjust.
Replace.
√
7 *
Transmission Change the transmission oil.√√ Check transmission for damage.√ Replace bearings.√
8 *Shift forks, guide
bars, shift cam Check all parts for wear and damage.√ Replace if necessary.
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Periodic maintenance an d a djustment
7-4
722 *Front fork Check operation and for oil leakage.
Adjust if necessary.√√ Clean dust seal and lubricate with
lithium-soap-based grease.
Replace fork oil.
√√ Replace oil seals.√
NO. ITEM ROUTINE
After
break-in
Everyrace
Every
third race
Every
fifth race
As
required
Check coolant level and for leakage.√√
16 *
Cooling system Check hoses for cracks or damage.√ Check radiator cap spring operation.√ Change coolant.
Every 2 years
Every year√ Check all chassis fitting and fasteners.√√
17
*Chassis fasteners
Correct or tighten if necessary.
18Air filter element Clean.√√ Replace.√
19 *Frame Clean and check for damage.√√
√√
20
*Fuel line Clean and check for leakage.√√
21 *
Brakes Adjust lever position and pedal height.
Lubricate pivot points.
Check brake disk surface.
Check fluid level and for leakage.
Tighten brake disk bolts, caliper bolts,
master cylinder bolts and union bolts.
Replace brake pads.
√ Replace brake fluid.√
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Periodic maintenance an d a djustment
7-5
7
EAU42012
TIP
 Hydraulic brake service
• Regularly check and, if necessary, correct the brake fluid levels.
• Every two years replace the internal components of the brake master cyl- inders and calipers, and change the brake fluid.
• Replace the brake hoses every four years and if cracked or damaged.
NO. ITEM ROUTINEAfter
break-in
Everyrace
Every
third race
Every
fifth race
As
required
23 *Shock absorber
assembly Check operation and adjust.√√ Tighten if necessary.
Lubricate with lithium-soap-based
grease.
√√ ∗
24 *Drive chain roller
and support guide Check for wear or damage.√ Replace if necessary.
25
*Rear suspension Check operation and tighten if
necessary.√√
Lubricate with lithium-soap-based grease.√√
Check operation, free play, and tighten if necessary.√√
26 *
Steering head Clean and lubricate with
lithium-soap-based grease.√
Replace bearings.√ Check tire air pressure, wheel runout, spokes for looseness, and tires for
wear.
√√
Tighten sprocket bolts if necessary.√√
27 *Tires and wheels
Check wheel bearings for looseness.√ Lubricate wheel bearings with
lithium-soap-based grease.√
Replace wheel bearings.√
28 *Moving parts and ca-
bles Lubricate.√√
29 *
Throttle grip Check operation.√√ Check throttle grip free play, and
adjust if necessary.
Lubricate cable and grip housing.
After washing the motorcycle or riding in the rain.∗
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