Propeller; Spark Plug - Yamaha 50G Service Manual

INSP
ADJ
PERIODIC SERVICE
D34900-0

PROPELLER

1. Check the blades for wear, damage or
cavitation erosion.
2. Check the spline for wear and damage.
D35000-0*

SPARK PLUG

1. Check the electrode 1 condition and
state of wear, note the insulator 2 color
and the electrode gap.
Normal condition is a medium to light
tan color.
Distinctly different color → Check the
engine condition.
White color
Blackish color : Electrical malfunction
2. Clean the spark plug with spark-plug
cleaner or wire brush. Use a wire gauge
to adjust the plug gap a to specifica-
tion.
Spark plug gap:
0.9 ~ 1.0 mm (0.035 ~ 0.039 in)
3. If the electrode becomes too worn,
replace the spark plug.
Standard spark plugs:
Except for Canada,
Europe, China and
50 hp
60, 70, 75,
80, 90 hp
3-13
: Lean fuel mixture
• Plugged filter, jet
• Air leak
• Wrong settings
• Defective spark plug
For Canada,
Europe, China
South Africa and South Africa
BR8HS-10 BR8HS-10
B8HS-10 BR8HS-10
E