9
9-3
4st 2/2.5/3.5 2007
YES
YES
Good?
Check compression pressure.
NO
Check fuel system.
NO
YES
Check spark plug.
YES
Replace stop switch.
Check igniter and/or
plug cap.
Use spark tester to check
ignition sparks.
Normal ?
Check electrical conductivity of
stop switch.
(with lock plate attached)
NO
NO
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Normal ?
Clean spark plug
and adjust gap,
or replace with new one.
Out of specified
range?
Before working on the outboard motor, check the hull, rigging, installation of outboard motor, fuel
level, and wire connections. For mechanical troubleshooting, refer to relevant troubleshooting
section in this chapter. For checking and servicing outboard motor, refer to service procedures
described in this manual to perform the work safely.
2. Power Unit
Trouble 1
Engine will not start or is a little hard to start. (Recoil starter operates normally.)
• When testing, put electrode cap assuredly to prevent
direct contact with spark tester wiring and leak of
electrical current.
• Keep flammable gas, fuel and oil away from tester to
prevent them from catching sparks.
• Inspection of Ignition System, Fuel System and Compression Pressure
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