1981-1984 Official Honda ATC250R Shop Manual, Page 48Get this manual
5CYLINDER HEADCYLINDER PISTON- ATe 250R
5-1 5-1 5-2 5-4
SERVICE INFORMATION TROUBLESHOOTING CYLINDER HEAD CYLINDERPISTON
REED VALVE
SERVICE INFORMATION
GENERAL INSTRUCTIONS
All cylinder head maintenance and inspection can be accomplished with the engine installedBefore disassembling the engine, clean the engine thoroughly so not to allow dirt and dust to fall into the cylinder and crankcaseRemove all traces of gasket material from the mating surfaces of the cylinder head, cylinder and crankcaseUse caution when servicing the cylinder and piston to prevent damage to themBefore assembling, apply clean 2stroke engine oil to all sliding surfaces of parts
SPECIFICATIONS
ITEM Cyli nder Cylinder bore