Yacht & Boat Builders

 List of Boat Dealers, services, National listing

Boat Parts, Equipment and Accessories

Boating Articles, Safety, Guides & Tips, "How To" Prevent and fix

IPS Drives - Volvo Penta on the 70-foot Spencer

Electric Outboards Motors - Advantages and Disadvantages

OutBoard fishing - Techniques

Torqeedo - clean Outboards - electric outboards & green boating, the latest green technology and advantages to electric propulsion

Hardware Installation on wooden boats - Hardware installation methods, problems and principles of Bonding and Fasteners

Learn How to weigh your boat and How to prevent overloading

Features of a jet driven - advantages and disadvantages

Outboard record and racing - old article published 1958 in 'Outboard Boating'

The Mariner - quality engineering Outboards: 2 and 4 stroke engines, spanning 2.5 hp to 300 hp include Electric versions

2 stroke and 4 stroke Outboards - see which comes out ahead

Inflatable and Outboards

Outboard Reliability - How to maximaze Outboard Reliability, engine Power and Satisfaction

Inboard or petrol Outboard - Which one to choose, Characteristics & Facts

2-stroke Outboards - Technology, Emissions, Standards and Tests

Small Boats - potentials & factors

E15 fuel - NOT EPA-approved its use in boats

Review and Comment:

Boat Outboards, Manufacturers, Public Review, discussions and Comment. Check out what Independent Boat Reviewers and Customers have to say.

Allison Boat - Overview of comments and discussions. More effecient, faster with the same Outboard.

SUZUKI - OutBoard Models & Comments

Yamaha. Need a high-performance outboards, Check out Public Review and Comment.

See and comment. - Fuel efficiency and technology of Evinrude E-TEC.

Outboard Factors and Advantages, How to Choosing,
Recommendations and Maintenance

Outboards, Commentary & helpful information

 Boat Outboards

Type and Outboard sizes

Many spend most of their time languishing in the dark, dank recesses of cockpit lockers, or exposed to salt spray on the pushpits of cruising yachts. They are fed on dubious mixtures of fuel, oil, dirt, and water, and lie forgotten throughout the winter months, but are expected to leap into life at the first pull of the starter cord in the spring!

Some of the most popular modern outboards produce about the same power as about 1,5 - 2hp . They provide the motive power for yachts' tenders and small dinghies and, as such, have to be light, simple and cheap. At the same time, they also have to be reliable, and rugged enough to put up with the kind of abuse that few of us would expect any other kind of engine to withstand.

With such a wide variety of outboard motors available, it is easy to find exceptions to any sweeping generalisations. Between the extremes are a wide range of different sizes and types: outboards of up to about 10 to 20 hp are often used to provide auxiliary power for small sailing boats, as a cheap alternative to inboard engines;

Outboards of 20-50hp engine are widely used on small motor cruisers and work boats, while engines of 40-200hp give lively performance on the sportsboats and ski boats.

Ths outboard engine today has become an important piece of boating equipment thanks to its compact, stand- alone format, which combines propulsion and direction - and for its power, which today ranges from 1.5hp to around 300hp.

Outboard advantages

Because it is attached to the transom of a boat, it allows the maximum amount of space in the cockpit. There is no need for a rudder: direction is supplied by the flow of water created by the propeller as the engine pivots, giving excellent steering. A set of remote steering controls connected to an instrument panel allows for easy manoeuvering.

Because it can be tilted, the angle can be adjusted to take into account load, speed and sea state. Since the engine can be raised, it enables a boat to be easily landed and trailed. The smaller models can be removed and carried easy.

Choosing and Outboard Factors

Outboard, suitable for...

There are now close to 300 different outboard engine models available on the market today, which is largely dominated by American and Japanese manufacture. In general, though, outboards are best for applications where low weight and low capital cost are particularly important, and are least suitable for applications where running costs or the risk of theft are key factors.

Many people, and especially first time boat buyers, will find the task of matching the engine and horsepower to the hull confusing. Engine salesmen are not necessarily the best people to advise a customer on what he or she really needs. So, if it's a motor boat you seek, first establish why you want it and ask yourself what you are going to do with it. Fishing perhaps, waterskiing, cruising, racing, and is it solely for leisure or commercial use?

Outboards are amazingly versatile. In the third world they are clamped on the back of canoes and flat-bottomed boats for exploration, transport and supply. Where proper fuel is scarce, they'll fire them up on petrol, then run them on paraffin.

Outboard users range from fire-fighters to fishermen, all attracted by the outboard's ability to deliver large amounts of power for its weight. They are also easily accessible for servicing. The smaller outboards can be quickly swapped from one boat to another and even the larger engines can be craned off the transom for a major overhaul.

photo: Compact and Light(18.4 kgs), 6 trim positions 3.5HP Evinrude Portable Outboard. An outboard as small as 3.5hp will be quite powerful enough for a small yacht's tender and can be unshipped easily and stored away on passage.


Not without good reason do boatbuilders put together balanced packages comprising hull, engine and even trailer. In most cases there is a choice of engine size for a particular hull - a minimum and maximum rating within safety guidelines.

These outboard builder recommendations should be strictly observed! These are very real dangers. Excess outboard power also means excess weight: hulls have been known to break up, or refuse to turn one way. At full power they have been known to flip over backwards, or ride on their chine and capsize.


The power recommended for one 5.5 m (15 to 18 ft) boat might be between 90 hp and 200 hp, on another 5.5 m boat between 75 hp and 115 hp.The horsepower outboard rating of modem engines is taken from the propeller shaft of the gearbox and is usually calculated at max rpm, after the machine has been run in. Outboards built prior to the early 1980's are rated at the engine and the figure may be much higher.

Mid-Range 4-stroke design 25 HP Outboard 2013 American Honda Motor Co. With a four-stroke outboard engine the cylinders are turned through 90° and stacked one on top of the other, as shown in these Honda drawings. The best course is to fit a high performance Honda outboard engine in the first place. Their legendary reliability has been helping all kinds of craft steer clear of trouble for more than thirty years. All our models have four-stroke boat engines.

Two-stroke outboards are internal combustion engines but we nearly always rate them in horsepower, not cc. A 200 hp outboard will roughly equal a 2.6 litre, or 2600 cc engine. The larger two stroke engines need approximately 13 cc for each 1 hp they develop in power. A 75 hp outboard engine is about the size of a 1000 cc car engine. The smaller engines of around 2 hp, 4 hp and 5 hp have about 25 cc to for each 1 hp they develop.

Maintenance and repairs

The environmental conditions in which the outboard engine is used demand the utmost care in the choice of construction materials.

The use of specialised aluminium for the propulsion unit and high quality stainless steel for all the bolts,nuts, and shafts give today's outboard resistance to the cumulative effects of corrosion.

Modern and 4-stroke outboards have benefited from many technical improvements over the years, including the use of electronics, which have affected their use, performance and reliability. A result of this, however, is that maintenance and repairs are becoming increasingly complex.

Before you can fix a sick engine, you have to know what makes a healthy engine run. The principle is pretty simple: A piston fits into each cylinder. When fuel explodes on lop of the piston, the piston is forced to move in the only direction it can, down the cylinder. The piston, which is connected by a rod to a crank-shaft, turns this downward motion into something more useful by rotating the crankshaft. The crankshaft, in turn, shoves the piston back up the cylinder for more action and and don't forget to check your fuel filter and top-up battery.

If your engine has been properly broken in, you’ll need to establish a maintenance routine that begins with systematic outboard checks every time you use your vessel.Besides the routine daily checks, it’s a good idea to Checks your engine Monthly to indicate any corrosion, leaky gaskets,electrical connections etc., make sure that gear-shift controls operate smoothly,as needed lubricate them.

Make sure all outboard cables and hoses, and engine- wiring are secured properly. If you have larger enfginre you will need to replace engine zincs as needed.As recommended by Outboard manufacturer all grease points on your Outboard's engine should be filled with grease.

Inspect the shaft for any Rope and fishing line wrapped around it and inspect the outbard propeller for burrs, nicks, and any unwanted bends in the blades.

As part of this cooling system service, it’s also a good idea to thoroughly flush your cooling system with fresh water and checking the thermostat. Now with the engine running, run fresh water up from the flushing adapter through the outboard's engine to this point. Also it’s a good idea to check the engine compression.

In many cases, and the damage that can be caused by improper settings can be realy catastrophic. So, unless you have considerable experience with boat outboard and engines, stay away from these engine adjustments and call Mechanic.

Tips to Economy Fuel

When It comes to choosing inboard or petrolBoat Outboard.

Related articles:

How to Winterise Your Outboard simply and quickly, Article by Jeremy Hoyland

Detailed Instructions - How to Install a Diesel Engine in 800 Easy - by Jack Harding

Powerful and Efficient Electric Boat Propulsion - Electric Outboard by eCycle Marine Inboard systems