Cleaning And Adjusting Spark Plug - Yamaha F25G Owner's Manual

F25GE, F25GET
EMU47111

Cleaning and adjusting spark plug

The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate something
about the condition of the engine. For exam-
ple, if the center electrode porcelain is very
white, this could indicate an intake air leak or
carburetion problem in that cylinder. Do not
attempt to diagnose any problems yourself.
Instead, take the outboard motor to a
Yamaha dealer. You should periodically re-
move and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode.
(1) Disconnect the clamps securing the
spark plug caps.
Maintenance
ZMU08826
77