Yamaha Outboard 100HP 4Strokes

Yamaha Outboard 4Strokes 50HP High Thrust

Yamaha Outboard 4Strokes 50HP High Thrust.

Yamaha Outboard F350

Why Outboard engine is better than inboard

Here are some of opinions on why outboard engine is better than inboard:

"i would prefer outboards to inboard GAS engines. These are my opinions:inboards are somewhat dangerous because of the fumes, gas issue. Dont forget to run those blowers. You will know if you forget.inboards take much more abuse than outboards. Most of the times they are run hard to keep a good speed. They are always in a bind. Notice what the rpm's are in your vehicle v/s what rpm an inboard runs. shafts, transmissions, stuffing boxes, rudders. More maint.Exhaust leaksGas hogsBelts, hoses, thru hulls, water pumps.packed in tight spaces making it hard to work on them.These are a few thing to be concerned with"

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"I picked outboards for my new boat.

Here's why,
#1 reason, EASY maintenance!

#2 Easy to change your engine oil and lower unit oil

No draining, no antifreeze,,ohh and the outboard is right in front of you and ultra easy to get at. Your not hanging down in the bilge to work on your inboard.

#3) You can trim your entire propulsion system out of the salt water! No shafts, no rudders.

#4) Backing up is a whole lot eaiser. You have a choice on whether your stern goes to port or starboard. With a single inboard it always goes one way.

#5) You want to use your boat in January? No problem, put it in, start the motors and head out. When you get home all you HAVE to do is make sure they are in the down position. No draining of the block. If your in the mood, re-fog the cylinders.

#6) If your in real skinny water, you can trim those outboards just about right out of the water, with the inboard, your prop is right down there with no place to go.

And lastly, If you hit a pot rope and it's cold water, trim the outboard right up, and free the rope. With your inboard,,,,your getting wet.

With an Inboard the maintenance is more than outboard!!!!! "

NEW YAMAHA V6 OFFSHORE COMPARISON

(Click to Zoom++)

NEW YAMAHA 225HP V6 OFFSHORE

The new Yamaha 225HP V6 Offshore is lighter, faster and more fuel efficient. It can run on 87 Octane fuel which can be found easily.
The new 4.2L V6 Offshore four strokes are substantially lighter than any other four stroke outboard (of similar horsepower) currently produced. They use a combination of new materials and processes, like plasma-fused sleeveless cylinders and an advanced polymer lower engine pan to reduce weight, and a lot of forward-thinking and effort. While lighter, they still retain Yamaha’s hard-earned reputation for durability and reliability.

In short, a great deal of research and planning, and the innovative application of materials and technologies that are proven in other industries, yet new to an outboard application. One example is “Plasma-Fused Sleeveless Cylinders”, where customary steel cylinder sleeves are replaced by a plasma-fusion process. The resulting cylinder walls are 60% harder than steel. This not only saved weight, but also allowed us to increase displacement, without enlarging the outer diameter of the cylinder. Of course, there are other weight-saving and power-enhancing features at work here, too, but suffice it to say Yamaha engineers have realized previously unimaginable low weight and high displacement in a V6 four stroke outboard. This results in breakthrough four stroke performance.

The new Yamaha 4.2L V6 Offshore outboards have the fastest time-to-plane of any four stroke offshore outboard, with Variable Camshaft timing for outstanding acceleration, and top speed comparable to or better than competitive outboards of the same horsepower, including two strokes*. And cruising speed is up to 19% faster than competitive four strokes, too (4000 rpm). Keep in mind that actual results can vary due to many different factors, including boat type, load, speed, water and atmospheric conditions, hull condition, operator ability, etc.

Offshore outboards are most often operated at mid-range throttle settings. In extensive Yamaha on-water testing, fuel economy on the new Yamaha V6 Offshore outboard was 17% better at 3500 rpm than its closest in-class competitor. When you consider that’s a direct comparison of competitive four stroke outboards, that’s really saying something.

amalube Outboard 4Strokes® oil is required which is certified with the National Marine Manufacturer’s Association (NMMA®) FC-W® stamp of approval for marine use. Yamalube Outboard 4Strokes® is NMMA FC-W-certified and are manufacturer-recommended. Using Yamalube Outboard 4Strokes® is important because it has the chemical formulation and corrosion resistance necessary for marine engines—automotive engine oils do not measure up to this standard. Yamalube Outboard 4Strokes® is available at your local Yamaha Marine main dealer.

Yamaha F250 4Stroke

Yamaha unleashes its biggest four-stroke outboard so far - the mighty F250A, which is based on the popular F225A but a whole bunch of refinements to improve power and fuel-efficiency

Yamaha showcased its new 250hp four-stroke engine to a group of marine media in September. The engine rounds out a full range of four-strokes from 2.5-250hp, including the recently-released and extraordinarily fuel-efficient 50, 60, 80, and 100hp four-strokes designed for small to medium-sized trailerboats. The four-stroke range compliments Yamaha's ever-popular two-stroke range, which is renowned for reliability and ease of servicing, and also includes the high-pressure direct-injection V-Max series from 150-300hp.

Of interest to small-boat owners is a new tiller handle, which is available for small- to mid-sized trailerboats. The tiller arm allows the operator to set trolling speed using a simple dial, anywhere from 600-1000rpm, and comes with electric start, throttle tension, power trim and tilt and gearshift functions at your fingertips. Combined with the extra length and ergonomic design, the new tiller arm makes controlling larger outboards easier than ever before. And it can be retrofitted to recent-model Yamaha outboards for just a few hundred dollars.

TOP GUN
The big news on the day, however, was the big 250hp four-stroke. The F250A houses a 3.3lt V6 powerhead with 24 valve DOHC technology delivering 250hp at the propshaft. The engine is based on the same 3.3lt powerhead from the F225A but boasts new single-belt driven Variable Camshaft Timing and 24 valve DOHC engine technologies to produce more low- to mid-range torque, outstanding fuel efficiency and exceptionally low exhaust emission levels, Yamaha claims.

Mounted on three different boats, the effect of the variable valve timing on the F250 could be felt immediately, with immense torque and pick-up being generated in the upper end of the rev range between 4000-6000rpm. Variable Camshaft Timing both increases and decreases the camshaft timing according to the engine rpm to increase the intake and exhaust efficiency throughout the low to mid range rpm band.

RELIABLITY
For additional strength and durability, the F250A features lightweight forged pistons and a heat-treated crankshaft and connecting rods. Yamaha opted for a single-belt drive with less moving parts, multi-point fuel injection for optimum all-weather operation and a high-output 46amp alternator to power all your boat's electrical systems.

Clean and fuel efficient operation is achieved through a blow-by gas re-burning system which removes any unburned fuel and sends it back to the combustion chamber. Quiet operation is also delivered by the large intake silencer and the noise-suppressing labyrinth exhaust system. Such refined engineering reduces exhaust emissions to CARB three-star levels. At all speeds, normal conversation could be had at the helm on all the boats - it really is a very smooth, quiet engine.

COMPUTER-CONTROLLED
Yamaha's sophisticated Electronic Control Module (ECM) is the driving intelligence behind the F250A. The electronically-controlled single throttle valve system - a first for Yamaha - enables precise control over the air intake, which is directed smoothly into each combustion chamber for greater power. The ECM receives input from nine sensors located around the engine and warns the operator of any impending problems. Should any sensors fail, Yamaha's Fail Safe System keeps the engine running. Concerns of engine temperature, amp output, and oil pressure should now be non existent, Yamaha says.

To make maintenance easier, a front-mounted freshwater flushing port offers convenient engine flushing without turning the key. Reliability and longevity is also enhanced with Yamaha's five-stage multiple coating over YDC-30 aluminium, more stainless steel componets, zinc sacrificial anodes, a super-tight cowling and the flushing system help to protect against corrosion.

PERFORMANCE
An engine each was mounted on a 7.4m plate aluminium AMM fishing boat, Cruise Craft's 685 Outsider and a Whittley 700 Sea Legend. The 250 had loads of power, particularly in the bottom and top end of the rpm range. It was also remarkably quiet for such a large engine.

The F250 pushed the big Cruise Craft out to 80kmh at 5900rpm, using 80lt/h of fuel. Backed off, a sea-keeping cruise of 42kmh was achieved at 3500 using just 26lt/h of fuel - excellent efficiency for blue-water long-hauling and of high importance considering rising petrol prices.

Yamaha F350 4Stroke

Yamaha's big gun – the F350 5.3 litre V8 outboard – delivers huge torque and offers owners of large offshore boats an irresistible advantage: lots more fish-fighting space in the cockpit. Even better, it comes with sophisticated manners.

The F350 was displayed at a number of New Zealand boat shows during 2007, but the first opportunity to see it in action came at a media launch in Australia late last year. And to get straight to the point, it is a remarkable engine.

It delivers everything implied in the 350hp/V8 description – oodles of torque and deep, gut-wrenching acceleration (a 45 per cent increase in thrust over a conventional 250hp four-stroke outboard). What’s missing is the V8 rumble: it's a remarkably quiet, smooth engine, free of any expected vibration. Boating journos glanced backwards on a number of occasions as we coasted to a stop – "whoops – the engine's just died."

It’s also equipped with a fascinating array of engineering innovations (it received the prestigious IBEX 2007 Award for Innovation late last year) that deliver performance, surprising fuel efficiency and the promise of hours of trouble-free running.

Apart from the space advantages in opting for an outboard on a large offshore boat (in place of the more conventional inboards with shafts or stern legs), there is also a substantial weight benefit – not only versus inboard engines, but also twin-rig outboards. Consider that the F350 weighs in at around 365kg – compared with the 440kg of twin Yamaha 150s (220kg each).

Yamaha F100 4Stroke

F100

Power and Precision

The Yamaha F100 it designed to make your time on the water easy. Smooth starting, whisper quiet operation and great fuel economy make operating this outboard an absolute pleasure.

An inline four cylinder configuration with its double overhead camshaft and four valves on each cylinder allows smooth exchange of intake fuel and exhaust for more power. This is matched with an electric fuel injection system that delivers just the right fuel/air mixture for any load and speed for excellent power and economy.

The F100 comes standard with digital gauges and can also be connected to the leading edge Yamaha Digital Network System with fuel management as an optional extra.

Engine

Engine Type	4-Stroke, 16 Valve DOHC Direct Action In-line 4
Displacement	1596 cc
Bore x Stroke	79 x 81.4 mm
Recommended Max RPM	5500-6000
Lubrication System	Wet-sump
Fuel Management	EFI
Ignition	TCI
Starter System	Electric
Alternator Output	12V - 25A with rectifier regulator
Operation Method	Remote control
Trim & Tilt Method	Power trim & tilt
Digital Guages	Standard
Digital Network Guages with Fuel Management	Optional
Gear Ratio	2.31 : 1

Dimensions

Height	F100BETL : 516mm F100BETX : 643mm
Weight	F100BETL : 184.8 kg F100BETX : 189.5 kg

Yamaha Outboard ready stock

Yamaha Outboard 2 Stroke : 2HP, 5HP, 8HP, 15HP, 25HP, 40HP, LONG SHAFT and SHORT SHAFT, KEROSENE and GASOLINE are ready on stock now

Yamaha Outboard 4 Stroke : Ai and 100HP are ready on stock now