2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 137Get this manual
POWER UNIT CYLINDERCRANKCASEPISTON ASSEMBLY
Piston Pin Oil Clearance
Measure: Piston pin hole diameter Piston pin outside diameter
Dial calipers Micrometer
Piston pin hole diameter Standard: Service limit: 14.002 -14.008 mm (0.55130.5515 in) 14.030 mm (0.5524 in)
Piston pin outside diameter Standard: Service limit: Piston pin oil clearance 0.0020.013 mm (0.000080.0005 in) Service limit: 0.040 mm (0.0016 in) If exceed service limitReplace Piston and or Piston pin Standard: 13.995 -14.000 mm (0.55100.5512 in) 13.980 mm (0.5504 in)