1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 43Get this manual
ISPECI I Item
MAINTENANCE SPECIFICATIONS
Model Worldwide
USA, CANADA
Margin thickness (D) Intake Exhaust Stem outside diameter Intake Exhaust Guide inside diameter Stem-to-guide clearance Intake Exhaust Stem runout limit VALVE SPRINGS Free length Free length limit Tilt limit PISTON(S) Piston-to-cylinder clearance Measuring point (D) Standard point (H)
mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm mm mm mm (in) (in) (in) (in)
F25A F25X
0.61.0 (0.0240.039) 0.71.1 (0.0260.043) 5.4755.490 (0.21550.2161) 5.4605.475 (0.21500.2155) 5.5005.512 (0.2147.2170) 0.0100.037 (0.00040.0015) 0.0250.052 (0.00040.0015) 0.016 (0.0006) 37.8539.85 (1.4911.569) 37.85 (1.49) 1.7 (0.06) 0.0350.065 (0.00140.0026) 64.95064.965 (2.55702.5573) 65.45065.465 (2.57682.5774) (0.007) 15.97415.985 (0.62890.6293)