Yamaha F150B - Crankcase Assembly

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Power unit technical data
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Crankcase assembly
(*1) The figures are for reference only.
Item Unit
Model
F150B FL150B
Cylinder
Bore mm (in) 94.000–94.017 (3.7008–3.7014)
Piston
Diameter mm (in) 93.921–93.941 (3.6977–3.6985)
Measuring point mm (in) 14.0 (0.55)
Piston clearance (*1) mm (in) 0.075–0.080 (0.0030–0.0031)
Ring groove (Top) mm (in) 1.23–1.25 (0.0484–0.0492)
Ring groove (2nd) mm (in) 1.22–1.24 (0.0480–0.0488)
Ring groove (Oil) mm (in) 2.51–2.53 (0.0988–0.0996)
Piston ring
End gap measuring point mm (in) 20.0 (0.8)
Top ring
Type Barrel
Dimension height (B) mm (in) 1.17–1.19 (0.0461–0.0469)
Dimension width (T) mm (in) 2.80–3.00 (0.1102–0.1181)
End gap mm (in) 0.15–0.30 (0.0059–0.0118)
Side clearance mm (in) 0.04–0.08 (0.0016–0.0031)
2nd ring
Type Taper
Dimension height (B) mm (in) 1.17–1.19 (0.0461–0.0469)
Dimension width (T) mm (in) 3.70–3.90 (0.1457–0.1535)
End gap mm (in) 0.30–0.45 (0.0118–0.0177)
Side clearance mm (in) 0.03–0.07 (0.0012–0.0028)
Oil ring
Dimension height (B) mm (in) 2.40–2.47 (0.0945–0.0972)
Dimension width (T) mm (in) 2.30–2.70 (0.0906–0.1063)
End gap mm (in) 0.15–0.60 (0.0059–0.0236)
Side clearance mm (in) 0.04–0.13 (0.0016–0.0051)
Connecting rod
Big end side clearance (*1) mm (in) 0.14–0.31 (0.006–0.012)
Crankpin oil clearance (*1) mm (in) 0.027–0.052 (0.0011–0.0020)
Crankshaft
Journal diameter mm (in) 51.980–52.000 (2.0465–2.0472)
Crankpin diameter mm (in) 49.980–50.000 (1.9677–1.9685)
Runout limit mm (in) 0.03 (0.0012)
Crankpin width mm (in) 22.0–22.10 (0.8661–0.8701)