2002 YAMAHA YZ85 transmission oil

ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols 1 to 7 are designed as
thumb tabs to indicate the chapter’s number
and content.
1General information
2Specifications
3Regular inspection and adjustments
4Engine
5Chassis
6Electrical
7Tuning
Illustrated symbols 8 to D are used to identify
the specifications appearing in the text.
8With engine mounted
9Special tool
0Filling fluid
ALubricant
BTightening
CSpecified value, Service limit
DResistance (
W), Voltage (V), Electric current (A)
Illustrated symbols E to I in the exploded
diagrams indicate grade of lubricant and loca-
tion of lubrication point.
EApply transmission oil
FApply engine oil
GApply molybdenum disulfide oil
HApply lightweight lithium-soap base grease
IApply molybdenum disulfide grease
Illustrated symbols J to K in the exploded
diagrams indicate where to apply a locking
agent and where to install new parts.
JApply locking agent (LOCTITE®)
KUse new one 12
34
56
78
90
AB
CD
EFG
HI
JK
GEN
INFO
SPEC
INSP
ADJ
ENG
CHAS–+ELEC
TUN
T R..
EMG
BM

SPEC
2 - 1
GENERAL SPECIFICATIONS
EC200000
SPECIFICATIONS
EC211000
GENERAL SPECIFICATIONS
Model name: YZ85 YZ85LW
YZ85P1 (USA)
YZ85LC (EUROPE)
YZ85(P)
(CDN, AUS, NZ, ZA)YZ85LW (EUROPE)
YZ85LWP (AUS, NZ)
Model code number: YZ85 YZ85LW
5PA1
(USA, CDN, EUROPE,
NZ, ZA)
5PA2
(AUS)5SH1
(EUROPE, NZ)
5SH2
(AUS)
Dimensions: YZ85 YZ85LW
Overall length 1,821 mm (71.7 in) 1,896 mm (74.4 in)
(USA, S, NZ, ZA)
1,818 mm (71.6 in)
(F, D, I, GB, E, CDN,
AUS)
Overall width 758 mm (28.9 in)¬
Overall height 1,161 mm (45.7 in) 1,204 mm (47.4 in)
Seat height 864 mm (34.0 in) 902 mm (35.0 in)
Wheelbase 1,258 mm (49.5 in) 1,278 mm (50.3 in)
(USA, S, NZ, ZA)
1,255 mm (49.4 in)
(F, D, I, GB, E, CDN,
AUS)
Minimum ground clearance 351 mm (13.8 in) 391 mm (15.4 in)
Basic weight: YZ85 YZ85LW
With oil and full fuel tank 71 kg (156.5 lb) 73.9 kg (162.9 lb)
Engine:
Engine type Liquid cooled 2-stroke, gasoline
Cylinder arrangement Single cylinder, forward inclined
Displacement 84.7 cm
3 (2.98 lmp oz, 2.86 US oz)
Bore ´ stroke 47.5 ´ 47.8 mm (1.870 ´ 1.882 in)
Compression ratio 8.2 : 1
Starting system Kickstarter
Lubrication system: Premix (30 : 1) (Yamalube 2-R)
Oil type or grade (2-cycle):
Transmission oil Yamalube 4 (10W-30) or SAE 10W-30 type SE
motor oil
Periodic oil change 0.50 L (0.44 lmp qt, 0.52 US qt)
Total amount 0.55 L (0.48 lmp qt, 0.58 US qt)
Coolant capacity (including all routes): 0.54 L (0.48 Imp qt, 0.57 US qt)
Air filter: Wet type element
2

2

SPEC
2 - 7
MAINTENANCE SPECIFICATIONS
Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Spark plug M14 ´ 1.25 1 20 2.0 14
Cylinder head (nut) M8 ´ 1.25 4 30 3.0 22
(stud bolt) M8 ´ 1.25 4 13 1.3 9.4
Cylinder (nut) M8 ´ 1.25 4 28 2.8 20
(stud bolt) M8 ´ 1.25 4 13 1.3 9.4
Impeller M8 ´ 1.25 1 14 1.4 10
Coolant drain bolt M6 ´ 1.0 1 10 1.0 7.2
Water pump housing M6 ´ 1.0 2 10 1.0 7.2
Air filter element M6 ´ 1.0 1 2 0.2 1.4
Carburetor joint M6 ´ 1.0 4 8 0.8 5.8
Reed valve M3 ´ 0.5 4 1 0.1 0.7
Exhaust pipe M6 ´ 1.0 2 12 1.2 8.7
Exhaust pipe stay M6 ´ 1.0 1 12 1.2 8.7
Silencer M6 ´ 1.0 1 12 1.2 8.7
Fiber (silencer) M6 ´ 1.0 2 10 1.0 7.2
Crankcase M6 ´ 1.0 11 8 0.8 5.8
Left crankcase cover M6 ´ 1.0 4 5 0.5 3.6
Right crankcase cover M6 ´ 1.0 4 10 1.0 7.2
Right crankcase cover M6 ´ 1.0 1 10 1.0 7.2
Clutch cover M6 ´ 1.0 6 10 1.0 7.2
Transmission oil drain bolt M8 ´ 1.25 1 10 1.0 7.2
Kickstarter crank M6 ´ 1.0 1 10 1.0 7.2
Primary drive gear M12 ´ 1.0 1 79 7.9 57
Clutch boss M12 ´ 1.0 1 70 7.0 50
Clutch spring M5 ´ 0.8 5 6 0.6 4.3
Drive sprocket M16 ´ 1.0 1 60 6.0 43
Crankcase bearing stopper M6 ´ 1.0 2 8 0.8 5.8
Shift pedal M6 ´ 1.0 1 10 1.0 7.2

SPEC
2 - 9
CARACTERISTIQUES D’ENTRETIEN
Roue:
Type de roue avant Roue à rayons ----
Type de roue arrière Roue à rayons ----
Taille/matériau de la jante avant 17 ´ 1,40/Aluminium ----
Taille/matériau de la jante arrière 14 ´ 1,60/Aluminium ----
Limite de voilage de la jante:
Radial ---- 2,0 mm (0,08 in)
Latéral ---- 2,0 mm (0,08 in)
Chaîne de transmission:
Type/fabricant DID428DS/DAIDO ----
Nombre de maillons 117 maillons+ attache ----
Jeu de la chaîne 35
à 45 mm (1,4 à 1,8 in) ----
Longueur de la chaîne (10 maillons) ---- 122,1 mm (4,81 in)
Frein à disque avant:
Diamètre extérieur ´ Epaisseur 220 ´ 3,0 mm (8,66 ´ 0,12 in) 220 ´ 2,5 mm
(8,66 ´ 0,10 in)
Limite de déflexion ---- 0,15 mm (0,006 in)
Epaisseur de plaquette 4,0 mm (0,16 in) 0,8 mm (0,03 in)
Diamètre intérieur du maître cylindre 11,0 mm (0,433 in) ----
Diamètre intérieur du cylindre d’étrier 22,22 mm (0,875 in) ´ 2 ----
Type de liquide de frein DOT n° 4 ----
Frein à disque arrière:
Diamètre extérieur ´ Epaisseur 190 ´ 3,0 mm (7,84 ´ 0,12 in) 190 ´ 2,5 mm
(7,84 ´ 0,12 in)
Limite de déflexion ---- 0,15 mm (0,006 in)
Epaisseur de plaquette 3,7 mm (0,15 in) 1,0 mm (0,04 in)
Diamètre intérieur du maître cylindre 12,7 mm (0,500 in) ----
Diamètre intérieur du cylindre d’étrier 27,0 mm (1,063 in) ´ 1 ----
Type de liquide de frein DOT n° 4 ----
Levier et pédale de frein:
Position du levier de frein 95 mm (3,74 in) ----
Hauteur de la pédale de frein
(distance verticale sous le sommet du
repose-pied)7 mm (0,28 in) ----
Jeu du levier d’embrayage 10
à 15 mm (0,39 à 0,59 in) ----
Jeu de la poignée des gaz 3
à 5 mm (0,12 à 0,20 in) ---- Elément Standard Limite

SPEC
2 - 11
CARACTERISTIQUES D’ENTRETIEN
Roue:
Type de roue avant Roue à rayons ----
Type de roue arrière Roue à rayons ----
Taille/matériau de la jante avant 19 ´ 1,40/Aluminium ----
Taille/matériau de la jante arrière 16 ´ 1,85/Aluminium ----
Limite de voilage de la jante:
Radial ---- 2,0 mm (0,08 in)
Latéral ---- 2,0 mm (0,08 in)
Chaîne de transmission:
Type/fabricant DID428DS/DAIDO ----
Nombre de maillons 121 maillons + attache ----
Jeu de la chaîne 35
à 45 mm (1,4 à 1,8 in) ----
Longueur de la chaîne (10 maillons) ---- 122,1 mm (4,81 in)
Frein à disque avant:
Diamètre extérieur ´ Epaisseur 220 ´ 3,0 mm (8,66 ´ 0,12 in) 220 ´ 2,5 mm
(8,66 ´ 0,10 in)
Limite de déflexion ---- 0,15 mm (0,006 in)
Epaisseur de plaquette 4,0 mm (0,16 in) 0,8 mm (0,03 in)
Diamètre intérieur du maître cylindre 11,0 mm (0,433 in) ----
Diamètre intérieur du cylindre d’étrier 22,22 mm (0,875 in) ´ 2 ----
Type de liquide de frein DOT n° 4 ----
Frein à disque arrière:
Diamètre extérieur ´ Epaisseur 190 ´ 3,0 mm (7,84 ´ 0,12 in) 190 ´ 2,5 mm
(7,84 ´ 0,12 in)
Limite de déflexion ---- 0,15 mm (0,006 in)
Epaisseur de plaquette 3,7 mm (0,15 in) 1,0 mm (0,04 in)
Diamètre intérieur du maître cylindre 12,7 mm (0,500 in) ----
Diamètre intérieur du cylindre d’étrier 27,0 mm (1,063 in) ´ 1 ----
Type de liquide de frein DOT n° 4 ----
Levier et pédale de frein:
Position du levier de frein 95 mm (3,74 in) ----
Hauteur de la pédale de frein
(distance verticale sous le sommet du
repose-pied)5 mm (0,20 in) ----
Jeu du levier d’embrayage 10
à 15 mm (0,39 à 0,59 in) ----
Jeu de la poignée des gaz 3
à 5 mm (0,12 à 0,20 in) ---- Elément Standard Limite

2 - 16
SPEC
EC240000
CABLE ROUTING DIAGRAM
1Hose guide
2Brake hose
3Throttle cable
4Fuel tank breather hose
5Engine stop switch lead
6CDI magneto lead
7Clamp
8Carburetor breather hose
9Carburetor overflow hose
0Transmission oil breather hose
ARadiator breather hose
BClutch cable
CSpark plug leadDCable guide
EBrake hose holder
ÈPass the fuel tank breather hose between the
handlebar and tension bar, then insert its end
into the hole of the steering stem.
ÉFasten the ground lead together with the ignition
coil.
ÊClamp the brake hose with the brake hose
holder.
ËFit the brake hose into the guides of the protec-
tor.
CABLE ROUTING DIAGRAM

3 - 1
INSP
ADJ
MAINTENANCE INTERVALS
EC300000
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maintenance and lubrication. Bear in mind
that such factors as weather, terrain, geographical location, and individual usage will alter the
required maintenance and lubrication intervals. If you are a doubt as to what intervals to follow in
maintaining and lubricating your machine, consult your Yamaha dealer.
ItemAfter
break-inEvery
raceEvery
third
raceEvery
fifth
raceAs re-
quiredRemarks
PISTON
Inspect and clean
Replace
ll
l
lInspect crack
Remove carbon
PISTON RING
Inspect
Replace
ll
llCheck ring end gap
PISTON PIN, SMALL END BEARING
Inspect
Replace
l
l
CYLINDER HEAD
Inspect and clean
Retighten
l
ll
lRemove carbon
Check gasket
CYLINDER
Inspect and clean
Replace
ll
lInspect score marks
Inspect wear
CLUTCH
Inspect and adjust
Replace
ll
l
Inspect housing, friction
plate, clutch plate and
spring
TRANSMISSION
Replace oil
Inspect
Replace bearing
ll
l
lYamalube 4 (10W-30) or
SAE 10W-30 SE motor oil
SHIFT FORK, SHIFT CAM, GUIDE BAR
Inspect
l Inspect wear
ROTOR NUT
Retighten
l
l
KICK SHAFT
Inspect idle gear
Replace
l
l
EXHAUST PIPE, SILENCER
Inspect
Clean
ll
l
CRANK
Inspect and clean
ll
CARBURETOR
Inspect, adjust and clean
ll
SPARK PLUG
Inspect and clean
Replace
ll
l
DRIVE CHAIN
Lubricate, slack, alignment
Replace
ll
lChain slack: 35 ~ 45 mm
(1.4 ~ 1.8 in)


3

3 - 4
INSP
ADJ
PRE-OPERATION INSPECTION AND MAINTENANCE
EC320000
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating
condition.
Before using this machine, check the following points.
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
CoolantCheck that coolant is filled up to the radiator cap.
Check the cooling system for leakage.P.3-5 ~ 9
FuelCheck that a fresh mixture of oil and gasoline is filled in the fuel
tank. Check the fuel line for leakage.P.1-12
Transmission oilCheck that the oil level is correct. Check the crankcase for leak-
age.P.3-12 ~ 13
Gear shifter and clutchCheck that gears can be shifted correctly in order and that the
clutch operates smoothly.P.3-9
Throttle grip/HousingCheck that the throttle grip operation and free play are correctly
adjusted. Lubricate the throttle grip and housing, if necessary.P.3-10
Brakes Check the play of front brake and effect of front and rear brake. P.3-16 ~ 21
Drive chainCheck drive chain slack and alignment. Check that the drive
chain is lubricated properly.P.3-22 ~ 24
WheelsCheck for excessive wear and tire pressure. Check for loose
spokes and have no excessive play.P.3-31 ~ 32
SteeringCheck that the handlebar can be turned smoothly and have no
excessive play.P.3-32 ~ 33
Front forks and rear shock
absorberCheck that they operate smoothly and there is no oil leakage. P.3-24 ~ 30
Cables (wires)Check that the clutch and throttle cables move smoothly. Check
that they are not caught when the handlebars are turned or
when the front forks travel up and down.—
Exhaust pipe and silencerCheck that the exhaust pipe is tightly mounted and has no
cracks.P.4-2
Rear wheel sprocket Check that the rear wheel sprocket tightening bolt is not loose. P.3-22
Lubrication Check for smooth operation. Lubricate if necessary. P.3-34
Bolts and nuts Check the chassis and engine for loose bolts and nuts. P.1-16
Lead connectorsCheck that the CDI magneto, CDI unit, and ignition coil are con-
nected tightly.P.1-6
SettingsIs the machine set suitably for the condition of the racing course
and weather or by taking into account the results of test runs
before racing? Are inspection and maintenance completely
done?P.7-1 ~ 19