2001 YAMAHA YFM400F maintenance

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Panel removal and installation
The panels illustrated need to be removed to
perform some of the maintenance described in
this chapter.
Refer to this section each time a panel has to
be removed or reinstalled.
1. Panel C 2. Panel D
3. Panel E 4. Panel F
1. Cache C 2. Cache D
3. Cache E 4. Cache F
1. Panel C 2. Panel D
3. Panel E 4. Panel F
1. Panel A 2. Panel B
1. Cache A 2. Cache B
1. Panel A 2. Panel B

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8. Reinstall the element to the element
guide.
9. Reinstall the element assembly and parts
removed for access.NOTE:The air filter element should be cleaned every
20 ~ 40 hours. It should be cleaned and lubri-
cated more often if the machine is operated in
extremely dusty areas. Each time filter element
maintenance is performed, check the air inlet
to the filter case for obstructions. Check the air
cleaner rubber joint to the carburetor and man-
ifold fittings for an air-tight seal. Tighten all fit-
tings securely to avoid the possibility ofunfiltered air entering the engine.CAUTION:Never operate the engine with the air filter el-
ement removed. This will allow unfiltered air
to enter, causing rapid engine wear and possi-
ble engine damage. Additionally, operation
without the filter element will affect carbure-
tor jetting with subsequent poor performanceand possible engine overheating.
1. Connect the hose.
1. Brancher le flexible.
1. Conecte la manguera.

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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 knowledge and expe-
rience to do so. However, the idling speed may
be performed by the owner as a part of the
usual maintenance routine.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 anddamage may result.

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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 volt-
age/ampere or constant voltage) is required
for recharging a sealed-type battery. Using a
conventional battery charger may shorten thebattery life.
2. Always make sure the connections are
correct when putting the battery back in
the machine.