Yamaha XV250 (1994) [130/291] Inspection and repair

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INSPECTION AND REPAIR ENG 4 Reface Valve seat Use 20 45 and 60 Valve Seat Cutter A CAUTION ___________________________ Remove just enough material to achieve satis factory seat When twisting cutter keep and even downward pressure to prevent chatter marks Cut sections as follows Section Cutter A 20 B 45 c 60 Valve seat refacing steps A Valve face indicates that valve seat is centered on valve face but is too wide Valve Seat Cutter Set Use lightly 20 cutter 60 cutter Desired Result To reduce valve seat width to 1 0 mm 0 04 in B Valve seat is in the middle of the valve face but too narrow Valve Seat Cutter Set Use 45 cutter Desired Result To achieve a uniform valve seat width of 1 0 mm 0 04 in C Valve seat is too narrow and right up near valve margin Valve Seat Cutter Set Use 4 20 20 cutter 45 cutter Desired Result To center the seat and to achieve its width of 1 0 mm 0 04 in