1994-1995 Yamaha FX700 (FX1) Service Manual, Page 74Get this manual
REED VALVE, CYLINDER HEAD, CYLINDER AND PISTON 2Inspect: Cylinder water jacket Mineral Cylinder inner surface Score or replaceUse #600-800 grit wet sandpaper
3Measure: Cylinder bore "D" Use cylinder gaugeOut of
Measure the cylinder bore "D" in parallelThen, find the average of the measurement
Standard Cylinder bore "0" Taper"T" Out of round "R" 81.00-81.02 mm (3.189-3.190 in)