XS 650 Yamaha bead blasted, mild street ported and rebuilt stock cylinder head. It has stock size valves, new stem seals and a valve job.
Glass beaded XS 650 cylinder head prior to rebuilding.
Factory machined production ridges left in the intake port pocket and valve seat area cleaned up and removed in the above image, exhaust ports get the same treatment.
Stock XS 650 intake valves (41 mm) are good quality one piece ferrous steel, and the stock exhaust valves (35 mm) are one piece stainless steel. Note the triple crossed tuning forks Yamaha logo in the center of both the above stock valves. They have 8 mm valve stems.
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