Yamaha F40BMHD, Service Manual

Page: 44 / 537

SPEC
2-4
MAINTENANCE SPECIFICATIONS
E
VALVES
Tappet clearance IN mm (in) 0.2±0.05 (0.008±0.002)
EX mm (in) 0.3±0.05 (0.012±0.002)
Valve dimensions
Head diameter "A" IN mm (in) 31.9 - 32.1 (1.255 - 1.263)
EX mm (in) 25.9 - 26.1 (1.020 - 1.027)
Face width "B" IN mm (in) 2.3 - 2.7 (0.091 - 0.106)
EX mm (in) 2.5 - 2.9 (0.098 - 0.114)
Seat width "C" IN mm (in)
0.9 - 1.1 (0.035 - 0.043)
EX mm (in)
Margin thickness "D"
IN mm (in) 0.6 - 1.0 (0.024 - 0.039)
EX mm (in) 0.7 - 1.1 (0.026 - 0.043)
Stem outside diameter
IN mm (in) 5.475 - 5.490 (0.2155 - 0.2161)
EX mm (in) 5.460 - 5.475 (0.2150 - 0.2155)
Guide inside diameter mm (in) 5.500 - 5.512(0.2147 - 0.2170)
Stem-guide clearance
IN mm (in) 0.010 - 0.037 (0.0004 - 0.0015)
EX mm (in) 0.025 - 0.052 (0.0004 - 0.0015)
Stem runout limit mm (in) 0.016 (0.0006)
VALVE SPRINGS
Free length IN, EX mm (in) 37.85 - 39.85 (1.491 - 1.569)
Free length, limit IN, EX mm (in) 37.85 (1.49)
Tilt limit IN, EX mm (in) 1.7 (0.06)
Item Unit
Model
Worldwide F40BMHD, WHD F40BED, F40BET
USA, Canada F40MH F40ER, F40TR