MS 650, MS 660
English
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N Clean the dirty spark arresting
screen, replace if damaged or
heavily carbonized
N Refit the spark arresting screen in
reverse order of steps
Version B
In this version, the muffler is equipped
with two spark arresting screens.
N Remove screw (1)
N Lift and pull out the spark arresting
screen (2)
N Clean the dirty spark arresting
screen, replace if damaged or
heavily carbonized
N Refit the spark arresting screen in
reverse order of steps
N Check second spark arresting
screen – as with Version A
N If the engine is down on power,
difficult to start or runs poorly at idle
speed, first check the spark plug.
N Fit a new spark plug after about 100
operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Remove the spark plug
N Move the Master Control lever to the
stop position 0
N Turn the knob above the rear handle
in the direction of the arrow and
remove the carburetor box cover
N Lift the air baffle (1) up and off
N Unplug spark plug boot (2)
N Unscrew spark plug
Checking the spark plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N Rectify the problems which have
caused fouling of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
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