1988-2006 Yamaha ATV YFS200 Blaster service manual PDF download file., Page 85Get this manual
INSPECTION and REPAIR l Place
a 400 600 grit wet sandpaper on the surface plate, and resurface the head using figure-eight sanding pattern-
Rotate the head several times avoid removing too much material from one side
CYLINDER AND PISTON 1Eliminate: Carbon deposits From the piston crown and ring grooves2Eliminate: Score marks and lacquer depostis From the sides of pistonUse 600 800 grit we sandpaper