F25

Our marine-specific, two cylinder, single overhead camshaft design features a new cylinder block and head to enhanced performance, durability and economy.

 

Manual-start models feature an easy grip starter knob with a built-in decompression device.

 

Lightweight, compact and fuel efficient.

Description

ENHANCED DURABILITY

A proven 498cc two-cylinder, SOHC design features a new cylinder block and head. The pistons, connecting rods, and valves are the same as used in its F60 big brother, for added strength, responsive power and excellent fuel efficiency in a compact package.

GREATER RELIABILITY

New electronics and a new micro-computer controlled ignition system mean dependable starting and consistent power, while an advanced air intake system drains away any water that enters the cowling during normal engine operation for long-term reliability.

RESPONSIVE AND FUEL EFFICIENT POWER

A streamlined intake manifold uses long tracks and smoother airflow, for reliable and responsive power with outstanding fuel efficiency.

SMOOTH AND QUIET

Engine exhaust is routed through a maze before exiting above the waterline through the idle exhaust relief outlet for unbelievably smooth and quiet operation.

CHOICE OF CONTROLS

Tiller handle models feature improvements in strength and operator comfort, with stronger components and improved grip. Our Multi-Function tiller is also available as an option on remote control model.

WAIST DRIVESHAFT

A specially-designed driveshaft that is narrow in the centre section and thicker on each end. This helps the driveshaft to temporarily flex when the propeller strikes a hard object reducing the risk of damage.

Additional information
ENGINE

Engine Type
Four stroke, In-Line 2-Cylinder with counter balancer
Displacement
498 cc (30.4 ci)
Bore & Stroke
65 x 75mm (2.56 x 2.95in)
RPM Range
5000-6000
Compression Ratio
9.4:1
Induction System
SOHC / 4 – valve
Alternator Output
13 Amps
Fuel Delivery
Single Carburetor with accelerator pump
Starting
Electric or manual
Ignition
CDI Microcomputer
Lubrication
Wet sump
Degree of Trim/Tilt
Power Trim and Tilt or Manual with 2-position shallow drive
Exhaust
Through Propeller. Water-cooled, Labyrinth
Cooling
Raw water, Thermostatic Control
Gear Shift
F/N/R
Gear Ratio
27/13 (2.08:1)

FUEL & LUBRICATION

Recommended Fuel
Unleaded Gasoline (Minimum Pump Octane 87)
Recommended Oil
Yamalube 4-M FC-W 10W-30 or 20W-40
Oil Capacity
1.7L (1.8 US qt)

GENERAL

Shaft Length
S: 15" or L: 20''
Dry Weight
76kg (168lbs)