2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 138Get this manual
FUEL SYSTEM ('04'05)
PILOT SCREW ADJUSTMENT
IDLE DROP PROCEDURE
NOTE: The pilot screw is factory pre-set and no adjustment is necessary unless the pilot screw is replaced Use tachometer with graduations of 50 rpm or smaller that will accurately indicate 50 rpm changeDamage to the pilot screw seat will occur if the pilot screw is tightened against the seat