1982-1983 Official Honda ATC 200E Big Red Shop Manual, Page 65Get this manual
ATC200E
CYLINDER HEAD VALVES
VALVE SEAT INSPECTION REFACING
Clean all Intake and exhaust valves thoroughy to remove carbo depositsApply light coating of Prussian Blue to each valve seat Lap each valve and seat usi ng rubber hose or other hand -lapping toolRemove and inspect each valve Measure the width of the valve face STANDARD: .7mm (O.07in) SERVICE LIMIT: 2.0mm(O .OBin) CAUTIONTh I'a"'e call1lOt he grould rhe 'ab'eaceis bllmedl or bad(1' lI'om or if it cOltacts th sea II lel'e ll ()'repace th raI'e
Inspect each valve seat If the seat is too widetoo narrow, or has low spotsthe seat must be refin ished to seal properly STANDARD1.2mm(O.05in) SERVICE LIMIT.5mm(O.06in)