2004-2005 Honda TRX450R Factory Sevice Manual, Page 150Get this manual
CYLINDER HEADIVALVE Remove the guides rom the fr eezerW hile the cyli nder head is sti ll heated, rive new va lve guides nto the cylinde head fro th cam shaft side until th exposed height is at the specified va lue (at th ma rk)
VALVE GUIDE DRIVER
Valve guide driver, 5.5 mm
VALVE GUIDE PROJECTION :
07742-0010100
IN: 16.8 -172 mm (0.660.68 in) EX: 119 -18.3 mm (O.70- 0n in)
l et the cylinder head cool to roo temperature
Take care nor to ritr Of Jean the reamer in the while
Ream the new valve guidesInsert the reamer from the combustion cham ber sid of the cyl inder head and always rotate the reamer clockwise
Use CUrling oil on rhe reamer duting
rhis opera tiorL
TOOL: Valve gu ide reamer, 5.5 mm