maintenance YAMAHA YFM400F 2001 User Guide

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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.