Briggs & Stratton 86262GS, Familiarization & Troubleshooting Manual

Page: 53 / 128

Section 2 • Generator Components & Systems
Portable Generator Familiarization & Troubleshooting Guide
51
Operation of the idle control system may be briefly
described as follows:
• Power for system operation is delivered to the circuit
board via the idle switch and wires 11D and 22.With
the idle switch ON and no load on the generator, a
(DC) voltage is sent to the idle control coil via wires 81
and 82.The coil becomes an electromagnet, pulling
throttle or governor linkage and lowers idle speed.
• Current flows through wires 11, 44 and through the
transformer primary coils only when an electrical load
is connected.This current flow induces a voltage and
current flow into the transformer secondary coil, which
is sensed by the circuit board.The circuit board opens
wire 81 and 82 circuits, to de-energize the coil.When
electrical loads are disconnected, current flow through
the transformer coil is terminated. Circuit board action
then closes wires 81 and 82 circuits to energize the coil
and reduce engine speed to idle.
Early V-Twin Engine Idle Control
The V-Twin idle control system operates in a fashion similar
to the idle control on other portable generators. For units
with idle control, the governor has been reworked to accept
a linkage mounting bracket (Figure 2.84, Item 3).
A link from the idle control solenoid is routed through an
opening in the heat deflector shield and connects to the
linkage mounting bracket.
Solenoid movement will actuate the linkage mounting
bracket and the governor control.
A governor return spring connects to the linkage mounting
bracket (Item 3) and to a spring bracket (Item 1).
Two solenoid mounting brackets are retained to the fuel
tank heat shield.The brackets are slotted to permit axial
adjustment of the idle control solenoid.The solenoid, along
with a solenoid cover, is sandwiched between the two
brackets and retained by screws (Figure 2.85).
IDLE CONTROL ON GN 190, 220,
320, 360, & 410 ENGINES
Figure 2.86 shows the governor and idle control coil used
on the single cylinder GN Engines.
Figure 2.86 — GN-190 Governor And Idle Control
Figure 2.85 — V-Twin Idle Control Solenoid
Figure 2.84 — V-Twin Engine Links And Springs