Operation Manual

32
english
HT 70, HT 75
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 boot 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.
Removing the Starter Cover
: Take out the screws (1).
: Remove the cable lug, if fitted.
: Lift the starter cover (2) away from
the tank (3) and pull it out from
under the shroud (4).
000BA036 TR
1
Replacing the Starter Rope
and Rewind Spring
386BA004 KN
1
1
1
2
3
4