SPEC
2-5
6885J11
Specification
Maintenance specification
Power unit (55D, 75A models)
(*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.
Item
Unit
Model
55DEHD
75AEHD
75AED
75AET
Power unit
Minimum compression
kPa
340
pressure (*1) at electric starter
(kgf/cm
2
, psi)
(3.4, 49)
Cylinder head
Warpage limit
mm (in)
0.1 (0.0039)
(lines indicate straightedge
position)
Cylinder
Bore size
mm (in)
82.000–82.020 (3.2283–3.2291)
Piston
Piston diameter (D)
mm (in)
81.935–81.955 (3.2258–3.2266)
Measuring point (H)
mm (in)
20.0 (0.79)
Piston clearance
mm (in)
0.065–0.070 (0.0026–0.0028)
(reference data)
Piston pin boss bore
mm (in)
19.904–19.915 (0.7836–0.7841)
Oversize piston
1st
mm (in)
0.25 (0.010)
2nd
mm (in)
0.50 (0.020)
Oversize piston diameter
1st
mm (in)
82.185–82.205 (3.2356–3.2364)
2nd
mm (in)
82.435–82.455 (3.2455–3.2463)
Piston pin
Outside diameter
mm (in)
19.895–19.900 (0.7833–0.7835)
6885J11_02_1 04.1.1 0:43 Page 6
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