Yamaha F6, F4 and F2.5 Portable Outboards

Name: Yamaha F6, F4 and F2.5 Portable Outboards
Brand: Yamaha Outboards

Yamaha 6, 4 and 2.5 hp portable four-stroke OHV outboards (139 cc and 72 cc), from 37 lb, with thermostatic cooling, wide steering angles and on-side storage oil retention.

Description

Yamaha's F6, F4 and F2.5 portable outboards are the smallest four-stroke motors in the range, for tenders and other light-duty craft.

Models

F6: 139 cc, 6 hp; labyrinth exhaust and long-span mounting for quiet running; built-in tank plus external tank option; 60 lb (15 in. shaft); 15 in. and 20 in. shafts; optional 6 A alternator
F4: 139 cc, 4 hp; easy-grip starter with decompression device; built-in tank with switchable external tank; 6 A alternator. The F4 set a Guinness world record for fuel efficiency, covering 67.27 statute miles on one gallon
F2.5: 72 cc, 2.5 hp; redesigned for portability and clean burning; 37 lb (15 in. shaft); 360° steering

Key features

Overhead-valve design, CDI or TCI ignition, balanced crankshaft
Thermostatic cooling; 180° steering (F6/F4)
Pressurized wet-sump lubrication with Easy Storage Oil Retention System for on-side storage
Built-in carrying handles and resting pads; tiller control with F-N-R shifting

Technical data (F6)

Single cylinder, 139 cc; bore x stroke 62 x 46 mm; compression 8.9:1
Output: 6 hp at 5000 rpm; full-throttle range 4500–5500 rpm
Weight: 27–28 kg (60–61 lb); manual start; carburettor
Gear ratio 2.08:1; exhaust above propeller; tilt 69°, trim -4° to +16°
C.A.R.B. 3-star; warranty 3-year pleasure, 3-year government, 1-year commercial

Specifications

Weight †	27 kg (60 lbs) - 28 kg (61 lbs)
Full Throttle RPM Range	4500 ~ 5500
Fuel Induction System	Carb
Recommended Engine Oil	Yamalube® 4M (See owner's manual)
Engine Type	1 cyl
Displacement	139cc
Bore x Stroke	62 x 46mm (2.44 x 1.81in)
Prop Shaft Horsepower	6hp at 5000 rpm
Alternator Output at W.O.T.	6 Amp
Compression Ratio	8.9:1
Recommended Fuel	Octane 87
Recommended Fuel Filtration	N/A
C.A.R.B. Rating	3-Star
Exhaust	Above Propeller
Intake	2
Ignition	CDI
Spark Plug	CR6HSB
Starting System	Manual
Lubrication	Wet Sump
Engine Oil Capacity	0.6L
Recommended Cooling	Thermostatic Control
Ethanol Blend Limit	10% Maximum
Gear Ratio	2.08:1
Gear Shift	Forward, Neutral, Reverse
Shaft Length	15" - 20"
Degree of Tilt	69°
Degree of Trim	-4° through +16°
Mounting Centers	N/A
Steering Angle (maximum)	90° from center, either direction
Warranty	Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial

CENTA Flexible Coupling Service by Everllence PrimeServ

Authorized service for CENTA flexible couplings on four-stroke engines: periodic inspection, rubber element replacement, original spare kits, alignment checks and resilient mounting replacement.

Equipment

Konrad Marine

Konrad Marine 620B Stern Drive

Konrad 620B single-propeller stern drive for diesel commercial, military, medium-duty and recreational performance boats; gear ratios 1.27:1 to 1.98:1, 17.25-20 in propellers, 50° steering range.

System / Package

Alfa Laval

Adaptive Fuel Line for Biofuels

Alfa Laval Adaptive Fuel Line: a modular, automated fuel handling platform for FAME-based biofuel blends, combining fuel conditioning modules, ALCAP separators and real-time control for multi-fuel operation on existing diesel engines.