Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 69Get this manual
Fuel System (Carburetor) 10) Inspection of Idle Engine Speed
12Start engine and run for minutes to warm upCheck idle engine speed Use tachometer to measure after warm up operation Set the measurement mode to stroke cylinder stroke cylinderTachometerPN3AC-99010-0 Idle Engine Speed1,2501,350rmin
11) Adjustment of Idle Engine Speed
12Start engine and run for minutes to warm upTurn throttle stop screw to direction or to adjust idle engine speed Turning throttle stop screw to direction increases the idle speed Turning throttle stop screw to direction decreases the idle speedIdle Engine Speed1,2501,350rmin