Yamaha F40B - Page 36

SPEC
Specification
2-9 67C3K11
Piston
Piston diameter (D) mm (in) 64.950–64.965 (2.5571–2.5577)
Measuring point (H) mm (in) 2.0 (0.08)
Piston clearance
(*1)
mm (in) 0.035–0.065 (0.0014–0.0026)
Piston pin boss bore mm (in) 15.974–15.985 (0.6289–0.6293)
Oversize piston diameter
1st mm (in) 65.200–65.215 (2.5669–2.5675)
2nd mm (in) 65.450–65.465 (2.5768–2.5774)
Piston ring groove
Top ring mm (in) 1.21–1.23 (0.0476–0.0484)
2nd ring mm (in) 1.51–1.53 (0.0594–0.0602)
Oil ring mm (in) 2.52–2.54 (0.0992–0.1000)
Piston pin
Outside diameter mm (in) 15.965–15.970 (0.6285–0.6287)
Piston ring
Top ring Barrel
Dimension B mm (in) 1.17–1.19 (0.0461–0.0469)
Dimension T mm (in) 2.30–2.50 (0.0906–0.0984)
End gap
(*1)
mm (in) 0.15–0.30 (0.0059–0.0118)
Side clearance mm (in) 0.02–0.06 (0.0008–0.0024)
2nd ring Taper
Dimension B mm (in) 1.47–1.49 (0.0579–0.0587)
Dimension T mm (in) 2.60–2.80 (0.1024–0.1102)
End gap
(*1)
mm (in) 0.30–0.50 (0.0118–0.0197)
Side clearance mm (in) 0.02–0.06 (0.0008–0.0024)
Oil ring
Dimension B mm (in) 2.36–2.48 (0.0929–0.0976)
Dimension T mm (in) 2.75 (0.1083)
End gap
(*1)
mm (in) 0.20–0.70 (0.0079–0.0276)
Side clearance mm (in) 0.04–0.18 (0.0016–0.0071)
Connecting rod
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 side clearance
(*1)
mm (in) 0.12–0.15 (0.0047–0.0059)
Crankpin oil clearance
(*1)
mm (in) 0.020–0.052 (0.0008–0.0020)
Big end bearing thickness
Blue mm (in) 1.494–1.498 (0.0588–0.0590)
Black mm (in) 1.490–1.494 (0.0587–0.0588)
Brown mm (in) 1.486–1.490 (0.0585–0.0587)
(*1)
The figures are for reference only.
Item Unit
Model
F30AMHD F40BMHD F40BWHD F40BED
T
B
T
B