GENERAL SERVICE INFORMATION
2-37
3-/ 4-Cylinder
11. Start and run the engine up to normal operating temperature.
With an accurate tachometer installed, adjust the throttle stop
screw to obtain the specified RPM at neutral idle and trolling
speeds:
Oil Pump Aperture Adjustment
NOTE
Engine ignition timing must be properly adjusted and
the carburetors synchronized before adjusting the oil
pump aperture.
The oil pump aperture is adjusted at a specified throttle setting by
adjusting the length of the oil pump link rod so the control lever is
properly aligned with the 7 mm scribe mark on the oil pump. Use
the following specification table and procedure to adjust the oil
pump aperture.
1. Set the carburetor throttle as specified.
2. Check the alignment of the specified indicator mark on the
control lever with the scribe mark on the oil pump. Marks must be
aligned as shown in the correct figure. If not aligned, determine if
link rod needs to be lengthened or shortened to bring the marks
into alignment.
3. Remove the oil pump link rod and make length adjustment.
Reinstall link rod.
4. Recheck the alignment at the specified throttle setting(s).
5. Repeat procedure until oil pump aperture is properly adjusted.
Model Neutral Idle RPM Trolling RPM
40 / 50 900 750
60 / 70 900 750
80 / 90 900 700
115 / 120 / 140 900 700
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