2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 92Get this manual
Fuel system
Test harness (3 pins): YB-06793 10Turn the engine start switch to ON11Measure the throttle position sensor output voltageAdjust the throttle position sensor position if out of specification13Tighten the starboard throttle stop screw until the output voltage is adjusted to specification as mentioned in step 11, plus 40 mV