OWNER'S MANUAL POWER JET Rev. 1.0
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Copyright by
FLY
Products
s.r.l.
Page
16
3.4 Carburetor Adjusting
Our carburetor is provided with a starter for the very first starting (cold starting) Flip up switcher A in
position 2 for starting, in position 1 for functioning.
You can set the carburetion at the desired revs. by the long black downward screw C. By turning it
counterclockwise you rich the mixture, while the opposite you lean it.
The basic setting is between 1 and 2.5 turns from the shut position.
The C screw must be turned very gently, always verifying the cleanliness of the "passage" (the point
where the nozzle of the idle enters the nozzle of the full, at about half revs.) in revving up. If the engine
pops, you tighten it, if it abates you loosen it.
The D screw sets the revs. at idle, by opening the butterfly valve.
The POWER JET carburetor has two adjustments,
detailed in Fig. 18.
Carburetor adjusting proceeds as follows: Warm the
engine by allowing it to idle for at least 5 minutes.
Adjust the idle mixture C for the fastest idle possible.
Once attained, adjust D for the slowest smooth and
stable idle possible.
Often, after making a few adjustments to the carburetor,
it is necessary to “start over”, and go back to the original
factory settings. The original factory settings for the
carburetor are:
Idle Mixture Screw (C in Fig. 18): 1.5 turns out from
stop
Idle Speed Screw (D in Fig.18): 1.5 turns out from stop
To restore the adjustments to the factory settings,
GENTLY turn the screws CW until they hit their stops,
and then back them out (CCW) the number of turns
described above.
Fig. 18 POWER JET PJ125 carburetor
Components shown:
A
– Choke Lever,
Position “
1
” is Choke
OFF
Position “
2
” is Choke
ON
B
– Carburetor Diaphragm
C
– Idle Mixture Screw
D
– Idle Speed Screw
