1985-1987 Honda TRX 250 Fourtrax 250 Service Manual, Page 58Get this manual
6CYLINDER HEADVALVES SERVICE INFORMATION TROUBLESHOOTING CYLINDER HEAD COVER REMOVALDISASSEMBL CAM CHAIN TENSIONER LIFTER DISASSEMBLY CAMSHAFT CYLINDER HEAD -1 -2 -3 -4 6-4 6-6 VALVE SEAT INSPECTION REFACING CYLINDER HEAD ASSEMBLY CYLINDER HEAD INSTALLATION CAMSHAFT INSTALLATION CAM CHAIN TENSIONER LIFTER ASSEMBLY CYLINDER HEAD COVER ASSEMBL YI NSTALLATION 6-B 6-11 -11 6- 12 -13 -14
SERVICE INFORMATION
GENERAL
This section covers cylinder head, valves, camshaft, rocker arm and cam chain tensioner lifter servicesThese services can be performed with the engine installed in the frame Camshaft lubrication oil is fed to the cylinder head through an oil pipe Be sure this pipe is not clogged before installationBefore assemblyapply molybdenum disulfide grease to the camshaft bearings to provide initial lubricationPour clean engine oil into the oil pockets in the cylinder head during assembly to lubricate the camshaft lobes
SPECIFICATIONS
STANDARD
1213 kgcm (170185 psi
SERVICE LIMIT
Cylinder compression
-36.026 mm 11.4183 in) 35.897 mm1.4133 in) 23.90 mm 10 .941 in) 19.90 mm (0.784 in) 24.05 mm (0.947 in) 20.05 mm (0.789 in) 0.10 mm (0.004 in) 0.10 mm (0.004 in) 12.05 mm (0.474 in) 11.92 mm (0.469 in) 0.08 mm (0.003 in) 35.2 mm (1.39 in) 38.0 mm 11.50 in )