Yamaha F150A, Service Manual

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