Yamaha F4B Service Manual

1-3
SPEC
Specification
Model data
Dimension and weight
Performance
Power unit
Item Unit
Model
F4BMH F5AMH F6CMH
Overall length mm (in) 750.0 (29.5)
Overall width mm (in) 403.0 (15.9)
Overall height
Smm (in)
1040.0 (40.9)
Lmm (in)
1168.0 (46.0)
Boat transom height
Smm (in)
440.0 (17.3)
Lmm (in)
568.0 (22.4)
Weight (with propeller)
S kg (lb)
27.0 (59.5)
L kg (lb) 28.0 (61.7)
Item Unit
Model
F4BMH F5AMH F6CMH
Maximum output
At 5000 r/min kW (HP) 2.9 (3.9) —
At 5500 r/min kW (HP) — 3.7 (5.0) 4.4 (6.0)
Full throttle operating range r/min 4000–5000 4500–5500
Engine idle speed r/min 1450–1550
Item Unit
Model
F4BMH F5AMH F6CMH
Type 4-stroke, OHV
Cylinder quantity 1
Total displacement cm³ (cu. in) 139.0 (8.5)
Bore  stroke mm (in) 62.0  46.0 (2.4  1.8)
Compression ratio 8.90 : 1
Control system Tiller handle
Starting system Manual
Fuel system Carburetor
Ignition control system CDI
Advance type Microcomputer
Starting enrichment Choke valve
Spark plug CR6HSB (NGK)
Cooling system Water
Exhaust system Under water
Lubrication system Wet sump

Yamaha F4B Specifications

General

Brand	Yamaha
Model	F4B
Category	Outboard Motor
Language	English