44
English / USA
MS 290, MS 310, MS 390
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.
To reduce the risk of fire and burn
injury, use only spark plugs
authorized by STIHL. Always press
spark plug boot (2) snugly onto
spark plug terminal (1) of the proper
size. (Note: If terminal has
detachable SAE adapter nut, it must
be attached.)
A loose connection between spark
plug boot and ignition wire
connector in the boot may create
arcing that could ignite combustible
fumes and cause a fire.
: Remove the screws (1).
: Ease fan housing away from
crankcase and remove it sideways.
: Use screwdriver or suitable pliers to
carefully remove spring clip (2) from
the starter post.
: Carefully remove the rope rotor with
washer (3) and pawl (4).
The rewind spring may pop out and
uncoil during this operation.
00BA036 TR
1
Replacing Starter Rope
and Rewind Spring
1
1
1
1
133BA014 KN
2
3
4
133BA015 KN
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