Yamaha F225F, Service Manual

Page: 44 / 576

1-21
SPEC
Specification
Crankcase assembly
Valve stem
Diameter
Intake mm (in) 5.477–5.492 (0.2156–0.2162)
Exhaust mm (in) 5.464–5.479 (0.2151–0.2157)
Runout
Intake and exhaust mm (in) 0.01 (0.0004)
Valve guide
Inside diameter
Intake and exhaust mm (in) 5.504–5.522 (0.2167–0.2174)
Valve guide clearance
Intake mm (in) 0.012–0.045 (0.0005–0.0018)
Exhaust mm (in) 0.025–0.058 (0.0010–0.0023)
Installation height mm (in) 11.300–11.700 (0.4449–0.4606)
Item Unit
Model
F225FET FL225FET F250DET FL250DET
Piston
Diameter mm (in) 95.945–95.960 (3.7774–3.7779)
Measuring point mm (in) 13.500 (0.5315)
Piston clearance mm (in) 0.040–0.067 (0.0016–0.0026)
Ring groove (top) mm (in) 1.230–1.250 (0.0484–0.0492)
Ring groove (2nd) mm (in) 1.220–1.240 (0.0480–0.0488)
Ring groove (oil) mm (in) 2.510–2.530 (0.0988–0.0996)
Pin boss inside diameter mm (in) 22.011–22.018 (0.8666–0.8668)
Pin outside diameter mm (in) 21.996–22.005 (0.8660–0.8663)
Cylinder
Bore mm (in) 96.000–96.012 (3.7795–3.7800)
Piston ring
Top ring
Type Barrel
Dimension height (B) mm (in) 1.200 (0.0472)
Dimension width (T) mm (in) 2.800–3.000 (0.1102–0.1181)
End gap (*1) mm (in) 0.200–0.300 (0.0079–0.0118)
Side clearance mm (in) 0.030–0.050 (0.0012–0.0020)
2nd ring
Type Taper
Dimension height (B) mm (in) 1.170–1.190 (0.0461–0.0469)
Dimension width (T) mm (in) 3.800–4.000 (0.1496–0.1575)
End gap (*1) mm (in) 0.600–0.750 (0.0236–0.0295)
Side clearance mm (in) 0.030–0.070 (0.0012–0.0028)
Oil ring
Dimension height (B) mm (in) 2.400–2.470 (0.0945–0.0972)
Dimension width (T) mm (in) 2.350–2.750 (0.0925–0.1083)
End gap (*1) mm (in) 0.150–0.600 (0.0059–0.0236)
Side clearance mm (in) 0.040–0.130 (0.0016–0.0051)
Item Unit
Model
F300BET FL300BET