Crankcase Assembly - Yamaha F150A Service Manual

Valve lifter
Outside diameter
Valve lifter clearance (reference data)
Valve spring
Free length
Tilt limit
Valve stem
Diameter (Intake)
Diameter (Exhaust)
Runout (Intake and exhaust)
Valve guide
Inside diameter (Intake and exhaust)
Valve guide clearance (Intake)
Valve guide clearance (Exhaust)
Installation height

Crankcase assembly

Piston
Diameter
Measuring point
Piston clearance
Ring groove (Top)
Ring groove (2nd)
Ring groove (Oil)
Pin boss inside diameter
Pin outside diameter
Cylinder
Bore
Piston ring (Top)
Type
Dimension height (B)
Dimension width (T)
End gap (reference data)
Side clearance
Piston ring (2nd)
Type
Dimension height (B)
Dimension width (T)
End gap (reference data)
Side clearance
30.970–30.980 mm (1.2193–1.2197 in)
0.020–0.055 mm (0.0008–0.0022 in)
48.08 mm (1.8929 in)
1.7 mm (0.07 in)
5.477–5.492 mm (0.2156–0.2162 in)
5.464–5.479 mm (0.2151–0.2157 in)
0.01 mm (0.0004 in)
5.504–5.522 mm (0.2167–0.2174 in)
0.012–0.045 mm (0.0005–0.0018 in)
0.025–0.058 mm (0.0010–0.0023 in)
11.3–11.7 mm (0.44–0.46 in)
93.921–93.941 mm (3.6977–3.6985 in)
13.5 mm (0.53 in)
0.030–0.048 mm (0.0012–0.0019 in)
1.23–1.25 mm (0.0484–0.0492 in)
1.22–1.24 mm (0.0480–0.0488 in)
2.51–2.53 mm (0.0988–0.0996 in)
21.021–21.031 mm (0.8276–0.8280 in)
21.008–21.017 mm (0.8271–0.8274 in)
94.000–94.017 mm (3.7008–3.7014 in)
Barrel
1.170–1.185 mm (0.0461–0.0467 in)
2.800–3.000 mm (0.1102–0.1181 in)
0.20–0.30 mm (0.0079–0.0118 in)
0.04–0.08 mm (0.0016–0.0031 in)
Taper
1.170–1.190 mm (0.0461–0.0469 in)
3.700–3.900 mm (0.1457–0.1535 in)
0.30–0.45 mm (0.0118–0.0177 in)
0.03–0.07 mm (0.0012–0.0028 in)
1-13
Power unit technical data