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PERIODIC MAINTENANCE AND ADJUSTMENT
7-3
7
√
5
*CylinderCheck cylinder for score marks or wear.
Clean.√
Replace.√ NO. ITEM ROUTINEAfter
break-inEvery
raceEvery
third raceEvery
fifth raceAs
required
6*ClutchCheck clutch housing, friction plates, clutch plates
and clutch springs for wear or damage.
Adjust.√ √
Replace.√
7*TransmissionChange the transmission oil.√
Check transmission for damage.√
Replace bearings.√
8*Shift forks, guide bars,
shift cam Replace if necessary. Check all parts for wear and damage.
√
9*Rotor nut
(flywheel magneto)Tighten.√√√
10*Kickstarter systemCheck idle gear for damage.
√
Replace if necessary.
11*Exhaust system Check exhaust pipe and muffler for carbon deposits.√ √
Clean.√
√
√ √
√ 12*CrankshaftCheck crankshaft for carbon deposits and damage.
Clean.
U5PA89E0.book Page 3 Tuesday, June 15, 2010 10:34 AM
Page 61 of 86
PERIODIC MAINTENANCE AND ADJUSTMENT
7-17
7
WARNING
EWA14390
Have a Yamaha dealer replace
excessively worn tires. Operat-
ing the motorcycle with exces-
sively worn tires decreases
riding stability and can lead to
loss of control.
The replacement of all wheel-
and brake-related parts, includ-
ing the tires, should be left to a
Yamaha dealer, who has the
necessary professional knowl-
edge and experience.
It is not recommended to patch
a punctured tube. If unavoid-
able, however, patch the tube
very carefully and replace it as
soon as possible with a high-
quality product.
EAU48321
Spoke wheels
WARNING
EWA10610
The wheels on this model are not de-
signed for use with tubeless tires.
Do not attempt to use tubeless tires
on this model.To maximize the performance, durabil-
ity, and safe operation of your motorcy-
cle, note the following points regarding
the specified wheels.
The wheel rims should be checked
for cracks, bends, warpage or oth-
er damage and the spokes for
looseness or damage before each
ride. If any damage is found, have
a Yamaha dealer replace the
wheel. Do not attempt even the
smallest repair to the wheel. A de-
formed or cracked wheel must be
replaced.
The wheel should be balanced
whenever either the tire or wheel
has been changed or replaced. An
unbalanced wheel can result in
poor performance, adverse han-
dling characteristics, and a short-
ened tire life.
EAU48372
Adjusting the clutch lever free
play The clutch lever free play should mea-
sure 10.0–15.0 mm (0.39–0.59 in) as
shown. Periodically check the clutch le-
ver free play and, if necessary, adjust it
as follows.
1. Slide the rubber cover back at the
clutch lever.
2. Loosen the locknut.
3. To increase the clutch lever free
play, turn the clutch lever free play
adjusting bolt in direction (a). To1. Clutch lever free play
2. Locknut (clutch lever)
3. Clutch lever free play adjusting bolt
4. Rubber cover
1
(a) 23
4
U5PA89E0.book Page 17 Tuesday, June 15, 2010 10:34 AM
Page 65 of 86
PERIODIC MAINTENANCE AND ADJUSTMENT
7-21
7
Be careful that water does not en-
ter the brake fluid reservoir when
refilling. Water will significantly
lower the boiling point of the fluid
and may result in vapor lock.
Brake fluid may deteriorate paint-
ed surfaces or plastic parts. Al-
ways clean up spilled fluid
immediately.
As the brake pads wear, it is nor-
mal for the brake fluid level to grad-
ually go down. However, if the
brake fluid level goes down sud-
denly, have a Yamaha dealer
check the cause.
EAU22731
Changing the brake fluid Have a Yamaha dealer change the
brake fluid at the intervals specified in
the TIP after the periodic maintenance
and lubrication chart. In addition, have
the oil seals of the master cylinders and
calipers as well as the brake hoses re-
placed at the intervals listed below or
whenever they are damaged or leak-
ing.
Oil seals: Replace every two
years.
Brake hoses: Replace every four
years.
EAU22760
Drive chain slack The drive chain slack should be
checked before each ride and adjusted
if necessary.
EAU41410
To check the drive chain slack
1. Install the removable sidestand
and place the motorcycle on it.TIPWhen checking and adjusting the drive
chain slack, there should be no weight
on the motorcycle.2. Shift the transmission into the neu-
tral position.
3. Move the rear wheel by pushing
the motorcycle to locate the tight-
est portion of the drive chain, and
then measure the drive chain slack
as shown.Drive chain slack:
35.0–45.0 mm (1.38–1.77 in)
U5PA89E0.book Page 21 Tuesday, June 15, 2010 10:34 AM
Page 81 of 86
SPECIFICATIONS
9-1
9
Dimensions:Overall length:
YZ85 1818 mm (71.6 in)
(AUT)(BEL)(CHE)(DEU)(DNK)(ESP)(FIN)
(FRA)(GBR)(GRC)(IRL)(ITA)(NLD)(NOR)
(POL)(PRT)(SVN)(SWE)
YZ85 1821 mm (71.7 in) (ZAF)
YZ85A 1818 mm (71.6 in)
YZ85LW 1903 mm (74.9 in)
YZ85LWA 1903 mm (74.9 in)
Overall width:
758 mm (29.8 in)
Overall height:
YZ85 1161 mm (45.7 in)
YZ85A 1161 mm (45.7 in)
YZ85LW 1205 mm (47.4 in)
YZ85LWA 1205 mm (47.4 in)
Seat height:
YZ85 864 mm (34.0 in)
YZ85A 864 mm (34.0 in)
YZ85LW 904 mm (35.6 in)
YZ85LWA 904 mm (35.6 in)
Wheelbase:
YZ85 1255 mm (49.4 in)
(AUT)(BEL)(CHE)(DEU)(DNK)(ESP)(FIN)
(FRA)(GBR)(GRC)(IRL)(ITA)(NLD)(NOR)
(POL)(PRT)(SVN)(SWE)
YZ85 1258 mm (49.5 in) (ZAF)
YZ85A 1255 mm (49.4 in)
YZ85LW 1286 mm (50.6 in)
YZ85LWA 1286 mm (50.6 in)Ground clearance:
YZ85 351 mm (13.82 in)
YZ85A 351 mm (13.82 in)
YZ85LW 393 mm (15.47 in)
YZ85LWA 393 mm (15.47 in)
Weight:Curb weight:
YZ85 71 kg (157 lb)
YZ85A 71 kg (157 lb)
YZ85LW 73 kg (161 lb)
YZ85LWA 73 kg (161 lb)Engine:Engine type:
Liquid cooled 2-stroke
Cylinder arrangement:
Single cylinder
Displacement:
84 cm³
Bore × stroke:
47.5 × 47.8 mm (1.87 × 1.88 in)
Compression ratio:
8.20 :1
Starting system:
Kickstarter
Lubrication system:
PremixEngine oil:Type:
YAMALUBE 2RTransmission oil:Type:
YAMALUBE 4 (10W-40) or SAE 10W-40
Oil change quantity:
0.50 L (0.53 US qt, 0.44 Imp.qt)
Cooling system:Radiator capacity (including all routes):
0.54 L (0.57 US qt, 0.48 Imp.qt)Air filter:Air filter element:
Wet elementFuel:Recommended fuel:
Premium unleaded gasoline only
Fuel tank capacity:
5.0 L (1.32 US gal, 1.10 Imp.gal)Carburetor:Type × quantity:
PWK28 x 1Spark plug(s):Manufacturer/model:
NGK/BR10EG
Spark plug gap:
0.5–0.6 mm (0.020–0.024 in)Clutch:Clutch type:
Wet, multiple-discTransmission:Primary reduction ratio:
65/18 (3.611)
Final drive:
Chain
U5PA89E0.book Page 1 Tuesday, June 15, 2010 10:34 AM
