General Instructions - KYMCO AK 550 Service Manual

6.Fuel System

GENERAL INSTRUCTIONS

● Scooter services can be done with the engine installed in the frame.
● Be sure to relieve the fuel pressure before fuel pump or fuel hose removal.
● Bending or twisting the control cables will affect operation and could cause the
cables to stick or bind, resulting in loss of vehicle control.
● 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 the Carburetor Cleaners to the inside of the throttle body, which
is coated with molybdenum.
● Do not snap the throttle valve from fully open to fully close after the throttle
cable has been removed; it may cause incorrect idle speed.
● Do not loosen or tighten the painted bolts and screws of the throttle body.
Loosening or tighten them 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.
● Do not take the fuel pump on the ground downward.
● Always replace the packing when the fuel pump is removed.
● The electronic fuel injection system is equipped with the self-diagnostic system.
If the Check Engine Lamp "CELP" illuminate while riding, follow the
self-diagnostic procedures to solve the problem.
● A faulty AFI 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 during the ignition
switch "ON"; it may cause the ECU damage.
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AK 550