8-7. Adjusting Engine Speed (Robin-Powered Units)
2200 ± 100 rpm
3700 ± 50 rpm
1
3
2
4
6 5
Tools Needed:
10mm
8 mm 
After tuning engine, check engine speeds with a tachometer (see table). If necessary, adjust speeds as follows:
Start engine and run until warm.
Remove wrapper to access speed adjustments.
Idle Speed Adjustment
Move Engine Control switch to Run/Idle position.
1Throttle Solenoid
2Mounting Screws
3Idle Speed Screw
Loosen mounting screws. Adjust solenoid position so engine runs at idle speed. If necessary, back out idle speed screw so solenoid can be moved to correct position. Tight- en mounting screws. Be sure sole- noid linkage works smoothly.
Turn idle speed screw for fine adjustments.
Weld/Power Speed Adjustment
Move Engine Control switch to Run position.
4Jam Nut
5Lock Nut
6Weld/Power Speed Adjustment Screw
Loosen jam nut and lock nut. Turn adjustment screw until engine runs at weld/power speed. Tighten jam nut, and then tighten lock nut.
YStop engine. Reinstall wrapper.
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