Power Unit (115B, 140B Models) - Yamaha E115A Service Manual

Power unit (115B, 140B models)

Item
Power unit
Minimum compression
pressure (*1)
Cylinder head
Warpage limit
(lines indicate straightedge
position)
Cylinder
Bore size
Piston
Piston diameter (D)
Measuring point (H)
Piston clearance
Piston pin boss bore
Oversize piston
1st
2nd
Oversize piston diameter
1st
2nd
Piston pin
Piston pin diameter
(*1) Measuring conditions:
Ambient temperature 20°C (68°F), wide open throttle, with spark plugs removed from all cylinders.
The figures are for reference only.
61U5H11
Unit
115BE
kPa
(kgf/cm 2 , psi)
mm (in)
mm (in) 90.000–90.020 (3.5433–3.5441)
mm (in) 89.920–89.935 (3.5402–3.5407)
mm (in)
mm (in)
mm (in) 23.074–23.085 (0.9084–0.9089)
mm (in)
mm (in)
mm (in) 90.170–90.185 (3.5500–3.5506)
mm (in) 90.420–90.435 (3.5598–3.5604)
mm (in) 23.065–23.070 (0.9081–0.9083)
Maintenance specification
Model
115BET
450 (4.5, 64)
0.10 (0.0039)
10.0 (0.39)
0.080–0.085 (0.0032–0.0033)
0.25 (0.010)
0.50 (0.020)
140BET
1
2
3
4
5
6
7
8
9
2-10