Bosch DIE 165 R User Manual download pdf (Page 14)

B.Adjustingthe lowspeedneedle(L)

Fig 4:18

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 need-

le 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 engi-

ne 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 2 200–2300 r/rein.

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.

C. Adjustingthe highspeed needle

(H)

Fig 4:19

Fuelsystem,carburetor

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. 5025036-01 is available, do

not allow the engine to race at more than 11200 r/rein.

Carburetor tuning is now finished and the throttle con-

trol can be released.

NOTE:

A carburetor that is set to give too weak a mixture will

result in a considerable power loss. Tune the carburetor

for maximum power and not for maximum speed.

Now adjust the H needle to the correct setting as

follows:

4:5

For Husqvarna Parts Call 606-678-9623 or 606-561-4983

www.mymowerparts.com

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Bosch DIE 165 R User Manual Page 14

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