Instruction Manual

BR 800
English
18
Adjusting Idle Speed
Engine stops while idling:
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
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".
Removing the Spark Plug
N Loosen the screw (1).
N Remove the cover (2).
N Pull off the spark plug boot (3).
N Unscrew the spark plug (4).
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.
WARNING
Arcing may occur if the adapter nut (1) is
loose or missing. Working in an easily
combustible or explosive atmosphere
may cause a fire or an explosion. This
can result result in serious injuries or
damage to property.
Adjusting the Carburetor
0000-GXX-6224-A0
Spark Plug
3
4
2
1
0000-GXX-5396-A0
000BA039 KN
A
1
000BA045 KN