Checking The Spark Plug - Stihl MS 460 Instruction Manual

English / USA
MS 460 Magnum
and other mufflers with
spark arresting screen:
1
2
1
: Take out the screws (1).
: Remove the muffler upper
casing (2).
4
3
: Bend back the retaining tabs (3).
: Remove the spark arresting
screen (4).
: Clean spark arresting screen.
If screen is damaged or heavily
carbonized, fit a new one.
: Refit the spark arresting screen in
the reverse sequence.
50

Checking the Spark Plug

1
1
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 /
Stopping the Engine".
: Clean dirty spark plug.
: Check electrode gap (A) and
readjust if necessary – see
"Specifications".
: Use only resistor type spark plugs
of the approved range.
Rectify problems which have caused
fouling of spark plug:
: Too much oil in fuel mix.
: Dirty air filter.
: Unfavorable running conditions,
e.g. operating at part load.
Fit a new spark plug after approx.
100 operating hours
or earlier if the electrodes are badly
eroded.
Rescue Saw