TOHATSU MFS 30B Owner's Manual page 51

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Do not hold propeller with hand(s)
when loosening or tightening propeller
nut. Put a piece of wood block between
propeller blade and anti-ventilation
plate to hold propeller.
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Do not install propeller without
thrust holder, or propeller boss
could be damaged.
Do not reuse split pin.
After installing split pin, spread the
pin apart to prevent it from falling
out which could lead to the propeller
coming off during operation.
Replacing the spark plugs
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Do not reuse spark plug with
damaged insulation, or sparks
can leak through crack, potentially
leading to electric shock, explosion
and/or fire.
Do not touch spark plugs
immediately after stopping engine
as they will be hot and could cause
severe burns if touched. Allow
motor to cool down first.
If the spark plug(s) is fouled, has
carbon build up, or is worn, it should
be replaced.
When reusing spark plugs, remove
dirt from the electrodes and adjust
spark gap to specification.
INSPECTION AND MAINTENANCE
Notes
When inspecting the plug, always
clean the gasket surface and use a
new gasket. Wipe off any dirt from the
threads and screw in the spark plug
to the correct torque.
Stop the engine.
Remove the top cowl.
Remove the spark plug caps.
Remove the spark plugs by turning
it counter-clockwise, using a 5/8"
socket wrench and handle.
Attach spark plug and tighten to
specified torque.
Use spark plug NGK DCPR-6E.
Electrode
Spark gap
(0.8 to 0.9 mm, 0.031 to 0.035 in)
Notes
Spark plug torque :
18.0Nm(13.3ft-lb)(1.84kgf-m)
If a torque-wrench is not available
when you are fitting a spark plug, a
good estimate of the correct torque
is 1/4 to 1/2 a turn past finger-tight.
Have the spark plug adjusted to the
correct torque as soon as possible
with a torque-wrench.
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