1972 Johnson 2HP Outboard Motor Service Manual, Page 23Get this manual
3-8 Run engine at full th.r ottleUsing tachometer, adjust high-speed needle until best setting is obtainedLow-Speed Needle
1 NOTE 1111
High-speed needle must correctly adjusted as described above before low-speed needle adjustment is With motor at operating temperature, run at slow speed (700-750 until Allow 15 seconds for motorto respond to adjustmentAdjustment of highspeed needle MUST repeated after final low-speed needle adjustmentrpm) with test propeller in tank or boatAdjust low-speed highest rprn reading and smoothest performance are obtained