2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 163Get this manual
FUEL SYSTEM (After '05) 4Start the engine and adjust the idle speed with the throttle stop screwIDLE SPEED: 1,700 100 rpm 5Turn the pilot screw in or out slowly to obtain the highest engine speed6Readjust the idle speed with the throttle stop screw7Turn the pilot screw in gradually until the engine speed drops 100 rpm8Turn the pilot screw out to the final opening from the position obtained in step 7FINAL OPENING: 1-14 turn out 9Readjust the idle speed with the throttle stop screwTHROTTLE STOP SCREW
HIGH ALTITUDE ADJUSTMENT