Ignition Cut-Off Control - Yamaha F4B Service Manual

TECH
FEA

Ignition cut-off control

There are two types of ignition cut-off control. One is a system to cut off the ignition during engine
cranking without outputting ignition signals a from ignition control circuit b when the engine speed
is 150 r/min or lower. The other one is a system to stop ignition to prevent damage to the engine
when over-revving. While this control system is activated, the ignition control circuit b keeps output-
ting ignition signals a without charging the capacitor c.
Ignition control during engine cranking
150 r/min or less
A
B
A Ignition control during engine cranking
B Engine speed control
2-3
Technical features and description
b
b
Engine speed control
5900 r/min or more
c
a
c
a