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Yamaha 55DEHD - Lower Unit (85 A Models)

Yamaha 55DEHD
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6885J11
2-12
9
8
7
6
5
4
3
2
1
Electrical (85A models)
Item Unit
Model
85AEHD 85AED 85AET
Ignition and ignition control
system
Spark plug gap mm (in) 0.91.0 (0.0350.039)
Spark plug cap resistance k 4.06.0
Ignition timing (full retarded) Degree BTDC 13
Ignition timing (full advanced) Degree BTDC 2325
Ignition coil resistance
Primary coil (B/WB) 0.180.24
at 20°C (68°F)
Secondary coil
(B/Wspark plug wire) k 3.264.88
at 20°C (68°F)
CDI unit output peak voltage
(B/WB)
at Cranking (loaded) V 130
at 1,500 r/min (loaded) V 150
at 3,500 r/min (loaded) V 150
Pulser coil output peak voltage
(W/RW/Y, W/BW/G)
at Cranking (unloaded) V 6.0
at Cranking (loaded) V 4.0
at 1,500 r/min (loaded) V 8.0
at 3,500 r/min (loaded) V 14.0
Pulser coil resistance 256384
at 20°C (68°F)
(W/RW/Y, W/BW/G)
Thermoswitch
ON temperature °C (°F) 8490 (183194)
OFF temperature °C (°F) 6074 (140165)
Lower unit (85A models)
Item Unit
Model
85AEHD 85AED 85AET
Gear backlash
Pinion-to-forward gear mm (in) 0.080.25 (0.00320.0098)
Pinion-to-reverse gear mm (in) 0.671.00 (0.02640.0394)
Pinion gear shims mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Forward gear shims mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Reverse gear shims mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Maintenance specification
Coil resistance and peak voltage are reference data.
Measuring conditions:
Ambient temperature 20°C (68°F).
6885J11_02_1 04.1.1 0:43 Page 13

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