Husqvarna 165 R Workshop Manual page 14

Carry out fine adjustment as follows:
1. Screw the L needle in slowly from the basic setting.
Engine speed will increase and then decrease when
the fuel-air mixture becomes too lean Note the needle
setting at which engine speed is highest.
2. Now unscrew the L needle and again note the setting
at which engine speed is highest. Note that the engine
will run slower when the fuel-air mixture is too rich
3. Turn the L needle to the position giving the highest
engine speed and then unscrew it by an amount cor-
responding to ten minutes on a clock face to give the
engine a slightly richer mixture.
4. Set the idling speed by means of throttle stop screw T to
2200-2300 r/min.
5. Open the throttle smartly a couple of times to check that
the engine responds.
If it does not unscrew the L needle by an amount cor-
responding to about three minutes on a clock face.
Try again.
Now adjust the H needle to the correct setting as
follows:
Run the engine at maximum speed by holding the throttle
control firmly open if the setting is correct the engine
should "four-stroke"
Reduce engine speed by slowly screwing in H needle
until fourstroking ceases From this position back it off
corresponding to ten minutes on a clock face
If a tachometer such as No 502 50 36 01 is available do not
allow the engine to race at more than 11200 r/min
Carburettor tuning is now flashed and the throttle control
can be released
NOTE
A carburettor that as set to gave too weak a mixture will
result in a considerable power loss Tune the carburettor
for maximum power and not for maximum speed
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