2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 214Get this manual
CYLINDER HEADIVALVECAMSHAFT Ream the valve gu ide to remove any carbon bu ild up before measuring the guideInsert the reamer from the combustion ch amber side of the cy linder head and always rotate the reamer clockwiseTOOLS :
Valve guide rea mer, 5.5 mm
079842000001 or 07984-2000000
(U.S.Aon ly )
Meas ure each valve guide and reco rd it.0
SERVICE LIMIT: 5.53 mm (0.218 in)
Subt ract each valve stern .0from the correspond ing guide 1.0to obtain th stem -to -cutoe clearance SERVICE LIMITSIN0.12 mm (O.OOS in EX: 0.14 mm 10.006 inl
nspecr and retoco If the stem-to-q uide clearance exceeds the servi ce fie valve seats lim it, determine if new guide ith standard W"lmever the veve dimensions woul bring th cle arance it hin tolergUIdes i1re replaced ance Inag6 9-131 If so, replace any guides as necessary and roam to fit If the stem- tc-qufde clearance exceeds me servi ce li it ith new gui e, also rep lace the valve
VALVE GUIDE REPLACEMENT
Mark new valve guides at the specified height md icated below, us ing ma rkerChill the new valve guides in freezer for about an hour, Heat th cylinder head to 130 C- 140' (27S-'r ro 290"F) with hot late or ovenDo not heat the cyl aVOid burns ho inder head bey nd 150C (300"FIUse temperature ind icato sticks, available from we ldi ng supply 18m11,ng Ihe sto resto be su re th cyli nder head is heated to the CVilnder hea USing lorch ro proper temperature 10 we,lt