3-20 FUEL SYSTEM (DFI)
DFI Servicing Precautions
There are a number of important precautions that should
be followed servicing the DFI system.
To maintain the correct fuel-air mixture (F/A), there must
be no inlet air leaks in the DFI system. Be sure to install
the oil filler cap [A] after filling the engine oil, using the
driver-filler cap [B].
Clutch Cover [C]
Special Tool - Driver-Filler Cap: 57001–1454
Torque - Oil Filler Cap: 1.5 N·m (0.15 kgf·m, 13 in·lb)
This DFI system is designed to be used with a 12 V sealed
battery as its power source. Do not use any other battery
except for a 12 V sealed battery as a power source.
Do not reverse the battery lead connections. This will
damage the ECU.
Do not disconnect the battery leads or any other electrical
connections when the ignition SW (switch) is on, or while
the engine is running. Otherwise, surge damages the
connector terminals or the DFI parts.
Take care not to short the leads that are directly con-
nected to the battery positive (+) terminal to the chassis
When charging, remove the battery from the motorcycle.
This is to prevent ECU damage by excessive voltage.
Whenever the DFI electrical connections are to be discon-
nected, first turn off the ignition SW (switch), and discon-
nect the battery (−) terminal. Do not pull the lead, only the
connector. Conversely, make sure that all the DFI elec-
trical connections are firmly reconnected before starting
Connect these connectors until they click [A].
Do not turn the ignition SW ON while any of the DFI elec-
trical connectors are disconnected. The ECU memorizes
Do not spray water on the electrical parts, DFI parts, con-
nectors, leads, and wiring. Never water a vehicle with
connectors unplugged because seals don't work and ter-
minals could corrode.
If a transceiver is installed on the motorcycle, make sure
that the operation of the DFI system is not influenced by
electric wave radiated from the antenna. Check operation
of the system with the engine at idle. Locate the antenna
as far as possible away from the ECU.