Auto Choke System; Ignition Circuit Cut-Off System - Yamaha YP250 Service Manual

AUTO-CHOKE SYSTEM
This system is the parallel connection of the ignitor unit circuit and the thermo switch as shown, detect-
ing the engine temperature, and facilitates the restarting with the warm engine.
S Circuit diagram
Battery
S Auto-choke operation
Engine condition
Thermo switch
Ignitor unit circuit
Auto-choke

IGNITION CIRCUIT CUT-OFF SYSTEM

A sidestand circuit is added to the existing electric starting circuit, thereby controlling the starter motor
operation and the ignition system of the igniter unit.
S Circuit diagram
Fuse
Battery
S Operating mode
Sidestand switch
OFF
(Sidestand in use)
ON
(Sidestand folded in)
Main switch
Thermo
Fuse
switch
Auto-choke
Start with the Crank with the
cold engine cold engine
OFF OFF
OFF ON
Activates Activates
Main switch
Starter relay
Start
Starter
switch
motor
Operation of brake
light
ON
OFF
ON
OFF
FEATURES
Igniter unit
C.P.U
Crank with the
warm engine
ON
ON
Not activate
Engine stop switch
Brake
switch
Relay
Brake light
Operation of starter
motor
Not operated
Not operated
Operated
Not operated
1-3
GEN
INFO
Ignition
Restart with the
warm engine
ON
OFF
Not activate
Ignitor unit
Sidestand
switch
Operation of igniter
unit control
Misfire
Misfire
Ignited
Ignited (ridden)