2004 YAMAHA GRIZZLY 660 maintenance

8-15 1. Panel A 2. Panel C 3. Panel B
1. Cache A 2. Cache C 3. Cache B
1. Panel A 2. Panel C 3. Panel B
4. Panel D 5. Panel E 6. Panel F
4. Cache D 5. Cache E 6. Cache F
4. Panel D 5. Panel E 6. Panel F
EBU00614
Panel removal and installation
The panels illustrated need to be removed to per-
form some of the maintenance described in this
chapter.
Refer to this section each time a panel has to be
removed or reinstalled.
EE.book Page 15 Tuesday, April 1, 2003 12:23 PM

8-33 1. Engine oil filler cap
2. Dipstick
1. Bouchon de remplissage d’huile de moteur
2. Jauge
1. Tapa de relleno de aceite de motor
2. Varilla
EBU10991
Engine oil and oil filter cartridge
The engine oil level should be checked before
each ride. In addition, the oil must be changed and
the oil filter cartridge replaced at the intervals
specified in the periodic maintenance and lubrica-
tion chart.
To check the engine oil level
1. Remove panel F. (See page 8-31 for panel
removal and installation procedures.)
2. Place the ATV on a level surface.
3. Start the engine, warm it up for several min-
utes, and then turn it off.
4. Wait a few minutes until the oil settles.
5. Remove the engine oil filler cap and wipe off
the dipstick with a clean rag.
EE.book Page 33 Tuesday, April 1, 2003 12:23 PM

8-81 1. Breather hose
1. Reniflard
1. Manguera del respiradero
9. Pull the air filter element over its frame.
10. Install the air filter element.
11. Install the air filter case cover and be sure to
connect the hose.
12. Install the seat.NOTE:_ The air filter element should be cleaned every 20–
40 hours. It should be cleaned and lubricated more
often if the machine is operated in extremely dusty
areas. Each time air filter element maintenance is
performed, check the air inlet to the air filter case
for obstructions. Check the air filter element rubber
joint to the carburetor and manifold fittings for an
airtight seal. Tighten all fittings securely to avoid
the possibility of unfiltered air entering the engine. _CAUTION:_ Never operate the engine with the air filter ele-
ment removed. This will allow unfiltered air to
enter, causing rapid engine wear and possible
engine damage. Additionally, operation with-
out the air filter element will affect carburetor
jetting with subsequent poor performance and
possible engine overheating. _
EE.book Page 81 Tuesday, April 1, 2003 12:23 PM

8-85
EBU00296
Carburetor adjustment
The carburetor is a vital part of the engine and re-
quires very sophisticated adjustment. Most adjust-
ing should be left to a Yamaha dealer who has the
professional knowledge and experience to do so.
However, the idling speed may be performed by
the owner as a part of the usual maintenance rou-
tine.CAUTION:
The carburetor was set at the Yamaha factory
after many tests. If the settings are disturbed
by someone without sufficient technical
knowledge, poor engine performance and
damage may result.
EE.book Page 85 Tuesday, April 1, 2003 12:23 PM

8-97
EBU01186
Brake fluid replacement
Complete fluid replacement should be done only
by trained Yamaha service personnel. Have a
Yamaha dealer replace the following components
during periodic maintenance or when they are
damaged or leaking.

Replace the oil seals every two years.


Replace the brake hoses every four years.
EE.book Page 97 Tuesday, April 1, 2003 12:23 PM

8-121
EBU00385
Battery maintenance
1. When the machine is not used for a month or
longer, remove the battery and store it in a
cool, dark place. Completely recharge the
battery before reinstallation.CAUTION:
A special battery charger (constant voltage/
ampere or constant voltage) is required for re-
charging a sealed-type battery. Using a con-
ventional battery charger may shorten the
battery life.2. Always make sure the connections are cor-
rect when putting the battery back in the ma-
chine.
EE.book Page 121 Tuesday, April 1, 2003 12:23 PM