Checking The Spark Plug - Stihl MS 460 Instruction Manual

MS 460 Magnum and other mufflers with
spark arresting screen
4
6
5
Remove four screws
N
Remove exhaust casing (4) of the
N
muffler
Bend back the retaining lugs (5)
N
Pull out spark arresting screen (6)
N
Clean the dirty spark arresting
N
screen, replace if damaged or
heavily carbonized
Refit the spark arresting screen in
N
reverse order of steps
MS 460

Checking the Spark Plug

Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Remove spark plug – see "Starting /
N
Stopping the Engine".
Clean dirty spark plug.
N
Check electrode gap (A) and
N
readjust if necessary – see
"Specifications".
Use only resistor type spark plugs of
N
the approved range.
Rectify problems which have caused
fouling of spark plug:
Too much oil in fuel mix.
N
Dirty air filter.
N
Unfavorable running conditions,
N
e.g. operating at part load.
Fit a new spark plug after approx. 100
operating hours or earlier if the
electrodes are badly eroded.
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