2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 99Get this manual
CYLINDER HEADVALVE
VALVE GUIDE REPLACEMENT
Chill the valve guide in freezer for about an hourWear Insulated gloves to aVOId
Heal the cylinder head to 130C-140C (275F-
290F) with hot plate or ovenDo not heat the cylinbums when han- der head beyond 150cC (300F)Use temperature indio dlmg the heated cator sticks, available from welding supply stores, cylinder head be sure the cylinder head is heated to the proper tem perature
Using torch to heat the cylinder head may cause warpingSupport the cylinder head and drive oul the old guides from the combustion chamber side of the cylinder headTOOLS:
Va lve guide driver, 5.5 rnm
07742-0010100
Install new O-rings onto the new valve guidesDrive the new valve guides in the cylinder head from the top of the cylinder head while the cyli nder head is still heatedTOOL: Valve guide driver, 5.5 mm