Kohler 4EOZ Service page 41

13. If the engine speed needs modification, turn the
cross slotted nuts.
Figure 5-20 Engine Speed Adjustment
Note: Tightening both cross slot nuts increases engine
speed because the axial movement of the
governor pin does not permit the control lever to
push the fuel pump pin in a position for lower fuel
supply.
Loosening both cross slot nuts decrease engine
speed because the governor pin pushes the
control lever towards the position for lower fuel
supply.
A half turn (180_) of both cross slot nuts generally
change the engine speed ±50 RPM.
Note: Keep the cross slotted nuts at least on the flat end
of the stud bolt. Otherwise the nuts self-securing
effect will not work.
protrudes out of the cross slotted nuts.
For larger speed variations, replace the governor
springs. Replace the cross slotted nuts whenever
unscrewing a nut.
modification in a controlled environment on a test bench
or with a revolution counter.
TP-6137 5/03
Normally, the stud bolt
Check every engine speed
Accelerator Lever
The accelerator lever is fixed by its hole at the pin of the
eccentric shaft. The ratchet plate is installed with its slot
at the eccentric shaft pin and kept in place with an 8 mm
nut. As the ratchet plate spring is used as a buffer for
engine deceleration (it holds the accelerator lever in the
higher engine speed position), the correct adjustment
between the accelerator lever and the ratchet plate is
very important. Perform this adjustment leaving a half
notch of the plate visible. See Figure 5-21.
If an incorrect adjustment is achieved and more notches
are visible, a manual engine stop operation may be
obstructed because the accelerator lever touches the
lower stop notch on the crankcase without cutting off the
fuel supply at the engine. If no notch is visible, damage
to the speed controller shaft linkage may occur.
To relocate the ratchet plate and accelerator lever on the
speed controller shaft, hold the accelerator lever and
move the ratchet plate until its slot is against the speed
shaft pin. At this position, tighten the 8 mm nut.
Figure 5-21 Ratchet Plate Notches
Section 5 Fuel System 29