27
AIR & FUEL SYSTEM
Max speed
NPTGSP2517A (straight shaft)
About 7900-8700RPM
NPTGCP2517B (curved split
shaft)
About 7400-7700RPM
Fig. 34
■ Remove the carburetor adjustment tool and re-check the max no load speed. Engage and release
the throttle trigger quickly to operate the trimmer at full throttle, and observe the RPM displayed on
the tachometer. Make sure the max speed is correct.
■ Adjust the L screw: while the trimmer is idling, turn the L screw clockwise using the carburetor
adjustment tool. Observe the RPM displayed on the tachometer until it reaches the max speed (Fig.
34). This max speed could be greater than or less than 4000 RPM.
■ Adjust the T screw:
- If the max speed adjusted in previous step is greater than 4000 RPM, turn the T screw counter-
clockwise using the screwdriver. Observe the RPM displayed on the tachometer until it reaches
about 4000 RPM.
- If the max speed adjusted in previous step is less than 4000 RPM, turn the T screw clockwise
using the screwdriver. Observe the RPM displayed on the tachometer until it reaches about 4000
RPM.
■ Adjust the L screw: turn the L screw counter-clockwise using the carburetor adjustment tool.
Observe the RPM displayed on the tachometer until the idle speed reaches about 3000 RPM (Fig.
35).
CLOCK SET
A
B
C
D
E
F
G
RESET
8120
rpm
Fig. 33
CLOCK SET
A
B
C
D
E
F
G
RESET
4630
rpm
CLOCK SET
A
B
C
D
E
F
G
RESET
3100
rpm
Fig. 35
