1-14
Service Information
4st 25/30 2022
13) Propeller Selection
Selecting a wrong propeller may cause
adverse effects on the engine life,
fuel consumption, etc. as well as the
performance.
Fully Open Operating RPM Range:
MFS 25D: 5000 to 6000 min
-1
(rpm)
MFS 30D: 5500 to 6500 min
-1
(rpm)
RPM
12) Idling
After the engine has warmed up, use a tachometer to
check that the idle revolution speed is as specified.
Idle Revolution Speed:
850 min
-1
(rpm)
RPM
11) Cooling Water Check Port
Check that water is discharged from the cooling water
check port
1
.
Select a propeller that is best-suited to type of boat and
application.
Tachometer:
P/N. 3AC-99010-0
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