2004-2005 Honda TRX450R Factory Sevice Manual, Page 149Get this manual
CYLINDER HEADIVAlVE Ream the guides to remov any carb on bui ld- up before meas uring he guide Insert the reamer from the combustion chamber side of th head and always rot ate the re amer clock-
wiseTOOL: Valve gu ide reamer, 5.5 mm
VALVE GU IDE REAMER
079842000001 r
079 842000000
(U.S.Ao nly )
Measure each valve guide 1.0and reco rd it
SERVICE LIMIT: INEX: 5.52 (0.217 in)
Subtract each valve stem 00fro the corr espo nd in guide to obtain th stem-t a-g uide clea rance.0 SERVICE LIM ITS: IN: 0.12 mm (0.005 in) EX: 0.14 mm (0.006 in )