Yamaha F15B Service Manual page 171

Ignition system (continued from previous page)
Check the fuel system and
compression pressure.
6D45F11
Yes
Measure the CDI unit output
peak voltage.
Does the out-
put peak voltage
exceed specifi-
cation values?
No
Measure the charge coil output
peak voltage.
Does the out-
put peak voltage
exceed specifi-
cation values?
Yes
Measure the pulser coil output
peak voltage.
Does the out-
put peak voltage
exceed specifi-
cation values?
Yes
Replace the CDI unit.
No
Does the engine start?
Yes
Ignition system troubles are clear.
Yes Check the connection
of the leads from CDI unit.
No
Replace the charge coil.
No
Replace the pulser coil.
Power unit
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