Maintenance
RPM Adjustments
Maintenance
G1801doc121817
2-7
2
2.7
RPM Adjustments
WARNING!
Remove the blade before performing any
engine service. Failure to do so may result in serious injury.
Check the RPM with a tachometer after the first 20 hours of operation and every 200
hours thereafter.
See Table 2-1.
Before checking the RPM, make sure belt and brake strap tensions are correct (See Saw-
mill Maintenance). Also check oil, fuel, and coolant levels.
Make sure the throttle cable does not affect the engine RPM when the clutch handle is
disengaged. Make sure the cable is not bent or kinked. Check that the cable spring, cable
guide, cable, and throttle brackets are aligned.
NOTE:
It is important that the above com-
ponents are aligned. Proper alignment allows any slack in the cable (when engine is
idling) to slide down into the cable spring. This maintains free operation of the cable and
prevents the cable from kinking. Make sure the shoulder bolt does not rub against the
crankcase vent tube.
1.
Start the engine to measure the low-end RPM.
2.
Refer to the engine manual to adjust the low-end RPM.
3.
Engage the clutch handle to throttle the engine and measure the high-end RPM. The
high-end RPM is factory-set at 3750. Readjust the throttle cable if necessary to increase
or reduce the high-end engine speed.
The throttle cable should be tensioned just enough so that the engine revs as soon as the
clutch/brake handle is engaged. NOTE: A properly adjusted throttle will extend the cable
spring 1/4” to 3/8” (6.4 - 9.5 mm) when running and have a slight amount of slack in the
cable when idling.
Engine
High End RPM
Low End RPM
G18
3750
1800
TABLE 2-1
200
