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Adjustments
Adjust Choke Control
Proper choke operation is dependent upon proper ad-
justment of choke control cable.
1. Park machine on a level surface, fully raise coring
head, engage parking brake, stop engine and remove
key from the ignition switch.
2. Remove air cleaner cover from engine to view choke
plate in carburetor.
3. Move choke control lever to RUN position. Check
that choke plate in carburetor is fully open.
4. Move choke control lever to CHOKE position. Check
that choke plate in carburetor is fully closed.
1
2
Figure 2
5. If needed, choke cable can be adjusted by loosening
1. Choke cable 2. Cable clamp
cable clamp screw and repositioning control cable until
choke plate operates correctly.
6. Install air cleaner cover to engine.
Kohler
Engine
Adjust Engine Speed
1. Allow engine to reach operating temperature before
checking or adjusting engine speed. Park machine on
a level surface, fully raise coring head and apply parking
brake.
2. With engine running, move throttle control lever to
FAST (high idle) position.
3. Using a tachometer, check that engine is operating
at 3400 + 50 RPM.
4. If high idle speed is incorrect, adjust high speed
1
screw on governor assembly until high idle is 3400 + 50
RPM (Fig. 3).
5. Move throttle control lever to SLOW (idle speed)
position.
6. Using a tachometer, check that engine is operating
at 1400 + 50 RPM.
7. For additional information, refer to the Kohler Engine
Service Manual that is included at the end of this Chap-
ter.
Figure 3
1. High speed screw
ProCore 648 Page 3 – 5 Kohler Engine