2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 76Get this manual
FUEL SYSTEM 4Start the engine and adjust the idle speed with the
throttle stop screwIDLE SPEED: 1,400
5Turn the pilot screw in or out slowly to obtain the highest engine speed
6lightly open the throttle 2-3 times, then adjust
the idle speed with the throttle stop screwTurn the pilot screw in gradually until the engine speed drops by 50 rpm8Turn the pilot screw out to the final opening7
FINAL OPENING: 1-7 turns ut
9Readjust the idle speed with the throttle stop
HIGH ALTITUDE ADJUSTMENT
SPECIFICATIONS
Between
3,000-8,000 ft (1,000-2,500 m)