KYMCO MXU 500i 2018 Service Information page 148

3.Fuel System
MXU 500i/700i
● Work in a fully ventilated area. Smoking or allowing flames or sparks in the work area or
where gasoline is stored can cause a fire or explosion.
● Do not apply carburetor cleaners to the inside of the throttle body.
● Do not snap the throttle valve from fully open to fully close after the throttle cable has
been removed; this may cause incorrect idle speed.
● Do not loosen or tighten the painted bolts and screws of the throttle body. This can cause
throttle and idle valve synchronization failure.
● Seal the cylinder head intake ports with tape or a clean towel to prevent dirt and debris
from entering the intake ports after the throttle body has been removed.
● Do not damage the throttle body. It may cause incorrect throttle and idle valve
synchronization.
● When the fuel pump is removed make sure it is stored in a clean area where it cannot fall
and be damaged. Also, be sure the fuel pump isn't resting on the fuel level sensor float arm.
● Always replace the fuel pump seal when the fuel pump is removed.
● The electronic fuel injection system is equipped with the self-diagnostic system. If the
Check Engine Lamp "CELP" lights while riding, follow the self-diagnostic procedures to
solve the problem.
● A faulty fuel injection problem is often related to poorly connected or corroded connectors.
Check those connections before proceeding.
● When disassembling the fuel injection parts, note the location of the O-rings. Replace
them with new ones upon reassembly.
● Do not disconnect the battery negative (-) or positive (+) cable while engine is running, it
may cause ECU damage.
● Do not disconnect or connect the ECU connector while the ignition switch is in the
ON position; it may cause the ECU damage.
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