2000-2005 Yamaha F40B Outboard Service Manual, Page 232Get this manual

CYLINDER HEAD
CHECKING THE VALVE SPRING
1Measure: Free length Out of specification Free length limit 31.8539.85 mm (1.4911.569 in) 2Measure: Replace
Tilt valve Out of specification

Replace
Tilt limit INEX 1.7 mm (0.07 in)

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