Yamaha F25 - Power Unit

1-4
1
Power unit
Item Unit
Model
F25EA
F25A T25A
Maximum output
at 5500 r/min kW (HP) 19.3 (25)
Full throttle operating range r/min 5000–6000
Maximum fuel consumption
at 5500 r/min
L (US gal,
Imp gal)/hr
9.2 (2.4, 2.0)
Engine idle speed r/min 925–1025
Item Unit
Model
F25MHA
F25EHA
Type 4-stroke L
Cylinder quantity 2
Total displacement cm
3
(cu. in) 498.0 (30.4)
Bore × stroke mm (in) 65.0 × 75.0 (2.56 × 2.95)
Compression ratio 9.40 : 1
Control system Tiller handle
Starting system Manual Electronic
Fuel system Carburetor
Ignition control system CDI
Advance type Micro computer
Maximum generator output V, A 12.0, 13.0
Starting enrichment Prime Start
Spark plug DPR6EB-9 (NGK)
Firing order 1–2
Cooling system Water
Exhaust system Propeller boss
Lubrication system Wet sump
Item Unit
Model
F25EA
F25A T25A
Type 4-stroke L
Cylinder quantity 2
Total displacement cm
3
(cu. in) 498.0 (30.4)
Bore × stroke mm (in) 65.0 × 75.0 (2.56 × 2.95)
Compression ratio 9.40 : 1
Control system Remote control
Starting system Electric
Fuel system Carburetor
Ignition control system CDI
Advance type Micro computer
Maximum generator output V, A 12.0, 13.0
Starting enrichment Prime Start
Spark plug DPR6EB-9 (NGK)
Firing order 1–2
Cooling system Water
Model data