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English / USA
HS 81 R, HS 81 T
Erratic idling behavior, poor
acceleration
: Check standard setting.
Idle setting is too lean:
: Turn low speed screw (L) about a
quarter turn counterclockwise until
the engine runs and accelerates
smoothly.
Machine stops when it is swung at
idle speed
: Check standard setting.
Idle setting too rich:
: Turn low speed screw (L) about a
quarter turn clockwise until the
engine idles smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
Fine tuning for operation at high
altitude
A slight correction of the setting may be
necessary if the engine does not run
satisfactorily:
: Check the standard setting.
: Warm up the engine.
: Turn the high speed screw (H)
slightly clockwise (leaner) – no
further than stop.
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
If the engine is down on power or if
maximum engine speed is irregular,
check the spark arresting screen (not
fitted in all markets) in the muffler.
Wait for the engine to cool down
completely before performing this
work.
: Take out the screws (1).
: Remove the exhaust pipe (2).
Spark Arresting Screen
in Muffler
21


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