Yamaha F200B - Page 37

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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) 3.700–3.900 (0.1457–0.1535)
End gap (*1) mm (in) 0.300–0.450 (0.0118–0.0177)
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) 2.300–2.700 (0.0906–0.1063)
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)
Connecting rod
Small end inside diameter mm (in) 21.022–21.037 (0.8276–0.8282)
Big end inside diameter mm (in) 53.015–53.035 (2.0872–2.0880)
Big end side clearance mm (in) 0.150–0.300 (0.0059–0.0118)
Oil clearance mm (in) 0.028–0.066 (0.0011–0.0026)
Crankshaft
Journal diameter mm (in) 62.968–62.992 (2.4791–2.4800)
Crankpin diameter mm (in) 49.976–50.000 (1.9676–1.9685)
Runout mm (in) 0.030 (0.0012)
Crankpin width mm (in) 21.500–21.550 (0.8465–0.8484)
Crankcase
Oil clearance mm (in) 0.035–0.050 (0.0014–0.0020)
Thermostat
Valve opening temperature °C (°F) 58–62 (136–144)
Valve opening stroke mm (in) 0.05 (0.0020)
Fully open temperature °C (°F) 70 (158)
Fully open stroke mm (in) 4.3 (0.17)
(*1) The figures are for reference only.
Item Unit
Model
F200BET FL200BET F250GET FL250GET
Power unit technical data