2017 YAMAHA YFM90 Owners Manual

Page 97 of 130

YAMAHA YFM90 2017  Owners Manual 8-15
8
5. Install the transmission oil drain bolt and its
new gasket, and then tighten the bolt to the
specified torque.
6. Refill with the specified amount of the recom- mended oil.  WARNING! Make su

Page 98 of 130

YAMAHA YFM90 2017  Owners Manual 8-16
81. Park the ATV on a level surface.
2. Remove the seat. (See page 4-12.)
3. Remove the air filter case cover by unhooking
the air filter case cover holders. 4. Remove the air filter element, and

Page 99 of 130

YAMAHA YFM90 2017  Owners Manual 8-17
8
5. Squeeze the excess solvent out of the air filter
element and let it dry. NOTICE:  Do not twist
the air filter element when squeezing it.
[ECB02310]
6. Check the air filter element and replac

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YAMAHA YFM90 2017  Owners Manual 8-18
8ment removed. This will allow unfiltered air
to enter the engine, causing rapid engine
wear and possible engine damage. Addi-
tionally, operation without the air filter ele-
ment will affect car

Page 101 of 130

YAMAHA YFM90 2017  Owners Manual 8-19
8
3. Tap the spark arrester lightly, and then use a
wire brush to remove any carbon deposits.
4. Insert the spark arrester into the muffler and align the bolt hole.
5. Install the tailpipe bolt a

Page 102 of 130

YAMAHA YFM90 2017  Owners Manual 8-20
8
TIPThe engine is warm when it quickly responds to
the throttle. 2. Attach the tachometer to the spark plug lead.
3. Check the engine idling speed and, if neces-sary, adjust it to specification

Page 103 of 130

YAMAHA YFM90 2017  Owners Manual 8-21
8
4. Tighten the locknut.
5. Slide the rubber covers to their original posi-
tions.
EBU24061Valve clearanceThe valve clearance changes with use, resulting in
improper air-fuel mixture and/or engi

Page 104 of 130

YAMAHA YFM90 2017  Owners Manual 8-22
8Rear brake
To check rear brake shoe wear, check the position
of the adjusting nut. If the nut is more than 18 mm
(0.71 in) from the end of the bolt, the brake shoes
need to be replaced.
EBU24332