2006 YAMAHA YFM80R engine

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Page 254 of 344

YAMAHA YFM80R 2006  Owners Manual 8-17
7. Fill the engine with oil and install the dip-
stick.
cC
Be sure no foreign material enters the
crankcase.
8. Warm up the engine for several minutes at
idle speed. Check for oil leakage while
w

Page 260 of 344

YAMAHA YFM80R 2006  Owners Manual 8-23
EBU11820
Spark plug inspection
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of the
spark plug can indicate the condition of the
engine.
For example, a v

Page 266 of 344

YAMAHA YFM80R 2006  Owners Manual w
q
1. Fastener 2. Air filter element1. Attache 2. Elément du filtre à air1. Sujeción 2. Elemento filtrante de aire
8-29
2. Remove the air filter case cover by
unhooking the fasteners.
3. Remove th

Page 268 of 344

YAMAHA YFM80R 2006  Owners Manual 8-31
NOTE:
The air filter element should be wet but not drip-
ping.
8. Install the air filter element.
9. Install the air filter case cover by hooking
the fasteners onto the air filter case.
10. Insta

Page 270 of 344

YAMAHA YFM80R 2006  Owners Manual 8-33
cC
Never operate the engine with the air filter ele-
ment removed. This will allow unfiltered air to
enter the engine, causing rapid engine wear
and possible engine damage. Additionally,
operatio

Page 272 of 344

YAMAHA YFM80R 2006  Owners Manual EBU00296
Carburetor adjustment
The carburetor is a vital part of the engine and
requires very sophisticated adjustment. Most
adjusting should be left to a Yamaha dealer who
has the professional knowle

Page 274 of 344

YAMAHA YFM80R 2006  Owners Manual 8-37
EBU13020
Idle speed adjustment
NOTE:
A diagnostic tachometer must be used for this
procedure.
1. Start the engine and warm it up for a few
minutes at approximately 1,000 to 2,000
r/min. Occasiona

Page 276 of 344

YAMAHA YFM80R 2006  Owners Manual 8-39
EBU00303
Valve clearance adjustment
The correct valve clearance changes with use,
resulting in improper fuel/air supply or engine
noise. To prevent this, the valve clearance must
be adjusted regu
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