2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 119Get this manual
CYLINDER HEADVALVECAMSHAFT
SERVICE INFORMATION
GENERAL
This section covers service of the rocker arms, cylinder head, valves and camshaftThese parts can be serviced with the engine installed in the frame When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their original locations Clean all disassembled parts with cleaning solvent and dry them by blowing them off with compressed air before inspection Be careful not to damage the mating surfaces when removing the cylinder head cover and cylinder headDo not strike the head cover and cylinder head too hard during removal Rocker arm lubrication oil is fed through the oil passages in the cylinder head and head coverClean the oil passages before assembling
SPECIFICATIONS
ITEM Cylinder compression at 800 rpm (min 1) Valve clearance Valve, valve Valve stem O.Dguide Valve guide I.DStem-to-guide clearance STANDARD 1,275 kPa (13.0 kgfcm 2, 185 psi) 0.13 (0.005) 5.4755.490 (0.21560.2161) 5.4555.470 (0.21480.2154) 5.5005.512 (0.21650.2170) 0.0100.037 (0.00040.0015) 0.0300.057 (0.00120.0022) 1.2 (0.05) 42.4 (1.67) 44.2 (1.74) 12.00012.018 (0.47240.4731) 11.966 -11.984 (0.47110.4718) 0.0160.052 (0.00060.0020)