Yamaha F20A Service Manual

2-6
SPEC
E
MAINTENANCE SPECIFICATIONS
LOWER
ELECTRICAL
Item Unit
Model
Worldwide F20A F25A
USA, CANADA — F25X
GEAR BACKLASH
Pinion - forward mm (in) 0.31 ~ 0.72 (0.012 ~ 0.028)
Mid-point mm (in) 0.51 (0.020)
Pinion - reverse mm (in) 0.93 ~ 1.65 (0.037 ~ 0.065)
Mid-point mm (in) 1.29 (0.051)
Pinion shim mm 0.7, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6
Forward shim mm 1.0, 1.1, 1.2, 1.3, 1.4
Reverse shim mm 1.0, 1.1, 1.2, 1.3
Item Unit
Model
Worldwide F20A F25A
USA, CANADA — F25X
IGNITION SYSTEM
Ignition timing Degree (BTDC) 10 ~ 30 ± 3
Charge coil output peak voltage
(G/W – W/G)
@ cranking 1* V 210
@ cranking 2* V 240
@1,500 r/min V 210
@3,500 r/min V 210
Pulser coil output peak voltage
(R – W)
@ cranking 1* V 90
@ cranking 2* V 90
@1,500 r/min V 210
@3,500 r/min V 240
CDI unit output peak voltage
(B/W – O)
@ cranking 1* V 180
@ cranking 2* V 200
@1,500 r/min V 190
@3,500 r/min V 190
Spark plug gap mm (in) 0.9 ~ 1.0 (0.035 ~ 0.039)
Charge coil resistance
(W/G – G/W)
Ω 660 ~ 710
Pulser coil resistance Ω 300 ~ 350
Ignition coil resistance
Primary Ω 0.08 ~ 0.70
Secondary kΩ 3.5 ~ 4.7
* Cranking 1: Open circuit
Cranking 2: Related parts are connected.

Yamaha F20A Specifications

General

Brand	Yamaha
Model	F20A
Category	Outboard Motor
Language	English