Yamaha XV250 (1994) [129/291] Inspection and repair

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INSPECTION AND REPAIR 4 Bore valve guide 2 to obtain proper valve stem clearance Use the Valve Guide Reamer 7 0 mm l Valve Guide Reamer 7 0 mm YM 01227 NOTE __________________________________ Reface the valve seat after installing the valve guide 302 013 VALVE SEAT 1 Clean Valve face Valve seat Remove carbon deposit 2 Inspect Valve seat Pitting Wear Reface valve seat 3 Measure Valve seat width J Out of specification Reface valve seat Valve Seat Width Intake 0 9 1 1 mm 0 035 0 043 in Exhaust 0 9 1 1 mm 0 035 0 043 in Valve seat width measurement steps Apply the Mechanic s bluing dye Dykem T to the valve face Install the valve into the cylinder head Press the valve through the valve guide and onto the valve seat to make a clean pattern Measure the valve seat width Whether the valve seat and valve face made contact bluing will have been removed If the valve seat width is too wide too narrow or seat has not centered The valve seat must be refaced 4 19