Tech Fea; Technical Features And Description; Engine Control System; Outline - Yamaha F4B Service Manual

TECH
FEA

Technical features and description

Engine control system

Outline

The F4B, F5A, F6C adopt the CDI ignition system consisting of the CDI unit and a permanent mag-
net of the flywheel magnet.
The CDI unit has a compact design with an integrated ignition coil.
There are two types of ignition control systems. One is ignition timing control at normal operation,
and the other one is ignition cut-off control during engine cranking and when over-revving.
b
a
a
a CDI unit
b Flywheel magnet
a Permanent magnet
2-1