Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 44Get this manual
SPEC Item
MAINTENANCE SPECIFICATIONS
Unit Model F4AF4 5.4755.490 (0.21560.2161) 5.4605.475 (0.21500.2156) 5.5005.512 (0.21650.2170) 0.0100.037 (0.00040.0015) 0.0250.052 (0.00100.0020) 0.03 (0.0012) 35.0 (1.38) 34.0 (1.34) 21.67.2 (0.8515.87) 1.2 (0.05) 0.0350.065 (0.00140.0026) 58.95058.965 (2.32092.3215) 10 (0.39) 13.00913.017 (0.51220.5125) 59.25 (2.333)1Except for USA 59.50 (2.343) 12.99513.000 (0.51160.5118)
Stem outside diameter Intake Exhaust Guide inside diameter Stem to guide clearance Intake Exhaust Stem runout limit VALVE SPRING Free length Free length limit Set length Tilt limit PISTON Piston-to-cylinder clearance Piston diameter (D) Standard Measuring point (H) Pin boss inside diameter Oversize piston diameter 1st 2nd PISTON PIN Outside diameter PISTON RINGS Top ring Type Dimensions (BxT) End gap (installed) Wear limit Side clearance (installed) 2nd ring Type Dimensions (BxT) End gap (installed) Ware limit Side clearance (installed)