Yamaha E40J - Page 21

Item Unit
Model
E40GMH E40GWH E40JMH E40JWH E40JW
Piston rings
Top ring
Dimension B mm (in) 1.970–1.990 (0.0776–0.0783)
Dimension T mm (in) 2.500–2.700 (0.0984–0.1063)
End gap mm (in) 0.30–0.50 (0.0118–0.0197)
Side clearance mm (in) 0.02–0.06 (0.0008–0.0024)
Oversize diameter
1st mm (in) 78.25 (3.0807)
2nd mm (in) 78.50 (3.0906)
2nd piston ring
Dimension B mm (in) 1.970–1.990 (0.0776–0.0783)
Dimension T mm (in) 2.500–2.700 (0.0984–0.1063)
End gap mm (in) 0.30–0.50 (0.0118–0.0197)
Side clearance mm (in) 0.03–0.07 (0.0012–0.0028)
Oversize diameter
1st mm (in) 78.25 (3.0807)
2nd mm (in) 78.50 (3.0906)
Connecting rods
Small-end inside diameter mm (in) 24.900–24.912 (0.9803–0.9808)
Big-end side clearance mm (in) 0.200–0.700 (0.0079–0.0276)
Small-end axial play limit mm (in) 2.0 (0.08)
Crankshaft
Crankshaft width A mm (in) 61.40–61.45 (2.4173–2.4193)
Crankshaft width B mm (in) 41.38–41.60 (1.6291–1.6378)
Crankpin diameter mm (in) 26.995–27.000 (1.0627–1.0629)
Runout limit mm (in) 0.03 (0.0012)
Thermostat
Opening temperature °C (°F) 58–62 (136–144)
Fully open temperature °C (°F) 70 (158)
Valve open lower limit mm (in) 3.0 (0.12)
Reed valves
Valve stopper height mm (in) 4.0–4.4 (0.157–0.173)
Valve bending limit mm (in) 0.2 (0.0079)
6F65G11
2-4
9
8
7
6
5
4
3
2
1
Maintenance specification