Yamaha F40BMHD, Service Manual

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MAINTENANCE SPECIFICATIONS
2-5
E
SPEC
PISTONS
Piston-cylinder clearance mm (in) 0.035 - 0.065 (0.0014 - 0.0026)
Piston side "D" mm (in) 64.950 - 64.965 (2.5570 - 2.5573)
Measuring point "H" mm (in) 2 (0.007)
Pin boss inside diameter mm (in) 15.974 - 15.985 (0.6289 - 0.6293)
Oversize piston
diameter 1st mm (in) + 0.25 (0.001)
2nd mm (in) + 0.50 (0.002)
PISTON PINS
Diameter mm (in) 15.965 - 15.970 (0.6285 - 0.6287)
PISTON RINGS
Top ring
(B) mm (in) 1.2 (0.05)
(T) mm (in) 2.4 (0.09)
End gap (installed) mm (in) 0.15 - 0.30 (0.006 - 0.012)
Side clearance mm (in) 0.01 - 0.03 (0.004 - 0.0012)
2nd ring
(B) mm (in) 1.5 (0.06)
(T) mm (in) 2.7 (0.11)
End gap (installed) mm (in) 0.30 - 0.50 (0.012 - 0.020)
Side clearance mm (in) 0.01 - 0.03 (0.0004 - 0.0012)
Oil ring
(B) mm (in) 2.5 (0.10)
(T) mm (in) 2.75 (0.11)
End gap (installed) mm (in) 0.20 - 0.70 (0.008 - 0.028)
Side clearance mm (in) 0.04 - 0.18 (0.002 - 0.007)
CONNECTING RODS
Small end inside diameter mm (in) 15.985 - 15.998 (0.6293 - 0.6298)
Big end inside diameter mm (in) 36.000 - 36.024 (1.4173 - 1.4183)
Big end oil clearance mm (in) 0.020 - 0.052 (0.0008 - 0.0020)
Big end-crank pin side
clearance mm (in) 0.15 - 0.22 (0.0059 - 0.0087)
Big end bearing color mm (in) A : Blue 36.016 - 36.024 (1.4180 - 1.4183)
B : Black 36.008 - 36.016 (1.4176 - 1.4183)
C : Brown 36.000 - 36.008 (1.4173 - 1.4176)
Item Unit
Model
Worldwide F40BMHD, WHD F40BED, F40BET
USA, Canada F40MH F40ER, F40TR