2018 YAMAHA YZ85 fuel filter

Table of contents
Location of important la bels ........... 1-1
Safety information ............................ 2-1
Description ....................................... 3-1
Left view ......................................... 3-1
Right view ....................................... 3-2
Controls and instruments ............... 3-3
Instrument an d control functions ... 4-1
Handlebar switch............................ 4-1
Clutch lever .................................... 4-1
Shift pedal ...................................... 4-2
Brake lever...................................... 4-2
Brake pedal .................................... 4-3
Fuel tank cap .................................. 4-3
Fuel ................................................. 4-4
Fuel tank breather hose.................. 4-6
Fuel cock ........................................ 4-6
Starter (choke) knob ....................... 4-7
Kickstarter ...................................... 4-7
Seat ................................................ 4-8
Adjusting the front fork ................... 4-8
Front fork bleeding ....................... 4-10
Adjusting the shock absorber assembly ................................... 4-10
Removable sidestand ................... 4-13
For your safety – pre-operation
checks ............................................... 5-1
Operation an d important ri din g
points ................................................ 6-1
Starting and warming up a cold engine ......................................... 6-1
Starting a warm engine .................. 6-2
Shifting ........................................... 6-2
Engine break-in .............................. 6-3
Parking ........................................... 6-5
Perio dic maintenance an d
a d justment ........................................ 7-1
Periodic maintenance and lubrication chart .......................... 7-2
Checking the spark plug ................ 7-6
Transmission oil.............................. 7-7 Coolant ............................................ 7-8
Cleaning the air filter element ....... 7-10
Adjusting the carburetor ............... 7-12
Adjusting the engine idling
speed ......................................... 7-13
Adjusting the throttle grip free play ............................................ 7-13
Tires .............................................. 7-14
Spoke wheels ................................ 7-16
Adjusting the clutch lever free play ............................................ 7-17
Checking the brake lever free play ............................................ 7-18
Checking the shift pedal ............... 7-18
Checking the front and rear brake
pads ........................................... 7-19
Checking the brake fluid level ....... 7-20
Changing the brake fluid ............... 7-21
Drive chain slack ........................... 7-21
Cleaning and lubricating the
drive chain ................................. 7-23
Checking and lubricating the cables ........................................ 7-23
Checking and lubricating the throttle grip and cable ............... 7-24
Checking and lubricating the
brake and clutch levers ............. 7-24
Checking and lubricating the brake pedal ................................ 7-25
Lubricating the rear suspension.... 7-25
Lubricating the swingarm pivots ... 7-26
Checking the front fork ................. 7-26
Checking the steering ................... 7-27
Checking the wheel bearings ........ 7-27
Supporting the motorcycle ........... 7-28
Front wheel ................................... 7-28
Rear wheel .................................... 7-29
Troubleshooting ............................ 7-31
Troubleshooting charts ................. 7-32
Motorcycle care an d stora ge .......... 8-1
Matte color caution ......................... 8-1
Care................................................. 8-1
Storage............................................ 8-3
U1SN86E0.book Page 1 Wednesday, June 7, 2017 10:21 AM

Description
3-1
3
EAU63371
Left view
12789
10 4
356
1. Radiator cap (page 7-8)
2. Fuel tank cap (page 4-3)
3. Rebound damping force adjuster (page 4-8)
4. Fuel cock (page 4-6)
5. Air filter element (page 7-10)
6. Seat (page 4-8)
7. Shift pedal (page 4-2)
8. Throttle stop screw (page 7-13)
9. Starter (choke) knob (page 4-7)
10.Compression damping force adjuster (page 4-8)
U1SN86E0.book Page 1 Wednesday, June 7, 2017 10:21 AM

Instrument and control functions
4-6
4
EAU41362
Fuel tank breather hose
Before operating the motorcycle:
 Check the fuel tank breather hose
connection.
 Check the fuel tank breather hose
for cracks or damage, and replace
it if necessary.
 Make sure that the end of the fuel
tank breather hose is not blocked,
and clean it if necessary.
TIP
If the fuel tank breather hose falls out,
reinstall it on the fuel tank cap with the
arrow mark on the one-way valve
pointed downward as shown.
EAU41281
Fuel cock
The fuel cock supplies fuel from the
tank to the carburetor while filtering it
also.
The fuel cock has two positions:
OFF
With the lever in this position, fuel will
not flow. Always return the lever to this
position when the engine is not run-
ning.
ON
With the lever in this position, fuel flows
to the carburetor. Normal riding is done
with the lever in this position.
1. Fuel tank breather hose
2. One-way valve
1. Arrow mark positioned over “OFF”
1. Arrow mark positioned over “ON”
U1SN86E0.book Page 6 Wednesday, June 7, 2017 10:21 AM

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.√
U1SN86E0.book Page 4 Wednesday, June 7, 2017 10:21 AM

Specifications
9-1
9
Dimensions:
Overall length:1820 mm (71.7 in) (YZ85, YZ85J)
1900 mm (74.8 in) (YZ85LW, YZ85LWJ)
Overall width: 760 mm (29.9 in)
Overall height:
1125 mm (44.3 in) (YZ85, YZ85J)
1155 mm (45.5 in) (YZ85LW, YZ85LWJ)
Seat height:
840 mm (33.1 in) (YZ85, YZ85J)
875 mm (34.4 in) (YZ85LW, YZ85LWJ)
Wheelbase:
1255 mm (49.4 in) (YZ85, YZ85J)
1285 mm (50.6 in) (YZ85LW, YZ85LWJ)
Ground clearance: 330 mm (12.99 in) (YZ85, YZ85J)
360 mm (14.17 in) (YZ85LW, YZ85LWJ)
Wei ght:
Curb weight:
71 kg (157 lb) (YZ85, YZ85J)
73 kg (161 lb) (YZ85LW, YZ85LWJ)
Engine:
Combustion cycle:
2-stroke
Cooling system: Liquid cooled
Number of cylinders:
Single cylinder
Displacement: 85 cm³
Bore × stroke:
47.5 × 47.8 mm (1.87 × 1.88 in)
Compression ratio:
8.1 : 1
Starting system: Kickstarter
Lubrication system: Premix lubrication
Engine oil:
Engine oil:
YAMALUBE 2R
Recommended brand: YAMALUBE
Transmission oil:
Type:Motor oil SAE 10W-30 type SE or higher or
Gear oil SAE 85W GL-3
Quantity: 0.50 L (0.53 US qt, 0.44 Imp.qt)
Coolant quantity:
Radiator (including all routes): 0.54 L (0.57 US qt, 0.48 Imp.qt)
Air filter:
Air filter element:Wet element
Fuel:
Recommended fuel:
Premium unleaded gasoline (Gasohol [E10]
acceptable)
Fuel tank capacity:
5.0 L (1.3 US gal, 1.1 Imp.gal)
Car buretor:
Type × quantity:
PWK28 × 1
Spark plu g(s):
Manufacturer/model:
NGK/BR10EG
Spark plug gap: 0.5–0.6 mm (0.020–0.024 in)
Clutch:
Clutch type:
Wet, multiple-disc
Drivetrain:
Primary reduction ratio:3.611 (65/18)
Final drive:
Chain
Secondary reduction ratio: 3.429 (48/14) (YZ85, YZ85J)
3.714 (52/14) (YZ85LW, YZ85LWJ)
Transmission type: Constant mesh 6-speed
Gear ratio: 1st:2.455 (27/11)
2nd: 1.882 (32/17)
3rd:
1.529 (26/17)
4th: 1.294 (22/17)
5th: 1.130 (26/23)
6th:
1.000 (25/25)
Chassis:
Frame type: Semi double cradle
U1SN86E0.book Page 1 Wednesday, June 7, 2017 10:21 AM

11-1
11
Index
A
Air filter element, cleaning .................... 7-10
B
Brake and clutch levers, checking and
lubricating ........................................... 7-24
Brake fluid, changing ............................ 7-21
Brake fluid level, checking .................... 7-20
Brake lever .............................................. 4-2
Brake lever free play, checking............. 7-18
Brake pedal............................................. 4-3
Brake pedal, checking and lubricating ........................................... 7-25
C
Cables, checking and lubricating ......... 7-23
Carburetor, adjusting ............................ 7-12
Care ........................................................ 8-1
Clutch lever ............................................. 4-1
Clutch lever free play, adjusting ........... 7-17
Coolant ................................................... 7-8
D
Drive chain, cleaning and lubricating .... 7-23
Drive chain slack................................... 7-21
E
Engine break-in....................................... 6-3
Engine idling speed .............................. 7-13
Engine serial number ............................ 10-1
Engine, starting a warm .......................... 6-2
Engine stop switch ................................. 4-1
F
Front and rear brake pads, checking.... 7-19
Front fork, adjusting................................ 4-8
Front fork, bleeding .............................. 4-10
Front fork, checking .............................. 7-26
Fuel ......................................................... 4-4
Fuel cock ................................................ 4-6
Fuel tank breather hose .......................... 4-6
Fuel tank cap .......................................... 4-3
H
Handlebar switch .................................... 4-1
I
Identification numbers .......................... 10-1
K
Kickstarter............................................... 4-7
L
Labels, location....................................... 1-1
M
Matte color, caution ................................ 8-1
P
Parking .................................................... 6-5
Part locations .......................................... 3-1 Periodic maintenance and lubrication
chart ..................................................... 7-2
R
Rear suspension, lubricating ................ 7-25
S
Safety information .................................. 2-1
Seat ........................................................ 4-8
Shifting ................................................... 6-2
Shift pedal .............................................. 4-2
Shift pedal, checking ............................ 7-18
Shock absorber assembly, adjusting ... 4-10
Sidestand ............................................. 4-13
Spark plug, checking ............................. 7-6
Specifications ......................................... 9-1
Starter (choke) knob ............................... 4-7
Starting and warming up a cold engine .................................................. 6-1
Steering, checking................................ 7-27
Storage ................................................... 8-3
Supporting the motorcycle................... 7-28
Swingarm pivots, lubricating ................ 7-26
T
Throttle grip and cable, checking and lubricating .......................................... 7-24
Throttle grip free play, adjusting........... 7-13
Tires ...................................................... 7-14
Transmission oil ..................................... 7-7
Troubleshooting ................................... 7-31
Troubleshooting charts ........................ 7-32
V
Vehicle identification number ............... 10-1
W
Wheel bearings, checking .................... 7-27
Wheel (front) ......................................... 7-28
Wheel (rear) .......................................... 7-29
Wheels .................................................. 7-16
U1SN86E0.book Page 1 Wednesday, June 7, 2017 10:21 AM