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Has there been any big changes in 4-strokes in the last decade?

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Has there been any big changes in 4-strokes in the last decade?

Old 10-19-2019, 02:13 PM
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Default Has there been any big changes in 4-strokes in the last decade?

Sorry its in the wrong spot on accident and I can't delete.

Have there been any big changes or are things pretty much the same? Is a F200 from 2005 the same as a F200 now?

Last edited by FlyingTexan; 10-19-2019 at 02:48 PM.
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Old 10-19-2019, 05:25 PM
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The new mercury platforms aer dam near the same weight as an early version efi 2str. With the reduction in weight the performance has been improved at the rated hp level
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Old 10-20-2019, 11:18 AM
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Originally Posted by FlyingTexan View Post
Is a F200 from 2005 the same as a F200 now?
not even close.
2005 the F200 was 583 pound, 3.3 liter, V6 w/ 6 throttle bodies
9.9:1 compression ratio running 87 octane

2019 F200 is 100 pounds lighter, 2.8 liter inline 4 cylinder,
single throttle body, variable camshaft timing
10.3:1 compression running 89 octane
and available w/ electronic control
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Old 10-20-2019, 12:28 PM
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Lots of small technical improvements but comparing spec sheets side by side the biggest difference you’ll notice is greatly reduced weight. That’s true of most of the mainstream manufacturers for probably every HP class.
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Old 10-20-2019, 12:35 PM
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Originally Posted by andosan View Post
Lots of small technical improvements but comparing spec sheets side by side the biggest difference you’ll notice is greatly reduced weight. That’s true of most of the mainstream manufacturers for probably every HP class.
How about four stroke models with a contra-rotating gear case? Direct injection? GPS position holding? Ability to laterally propel a boat?
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Old 10-20-2019, 04:42 PM
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Originally Posted by alloyboy View Post
How about four stroke models with a contra-rotating gear case? Direct injection? GPS position holding? Ability to laterally propel a boat?
Direct injection is an improvement but not a ground breaking one.

Contra-rotating - do you mean like the Suzuki 350? Again an improvement but an incremental one.

Like I said - lots of small technical improvements. Digital throttle is another one.

I’d argue that GPS and joystick systems are not related to engines - they’re external systems; but granted they are somewhat revolutionary for outboard powered boats.
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Old 10-20-2019, 04:48 PM
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They've about caught up with passenger car engines. Although direct injection isn't as common yet in the outboard as it is in the car. I personally do not think direct injection is as reliable but it definitely increases power and efficiency.
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Old 10-20-2019, 04:55 PM
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Originally Posted by alloyboy View Post
How about four stroke models with a contra-rotating gear case? Direct injection? GPS position holding? Ability to laterally propel a boat?
I’d consider direct injection a downgrade. Small efficiency/power improvement at the cost of other issues.
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Old 10-20-2019, 05:01 PM
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Originally Posted by NEBassMan View Post
I’d consider direct injection a downgrade. Small efficiency/power improvement at the cost of other issues.
Some feel the same about two stroke carbs to four stroke carbs. A down grade.

I suppose some Luddite somewhere sees every change as a negative.

Ah for the good ole days. Carbs. With pull to choke knobs. Bias ply tires. Roll up windows. Three speed on the column shift. Wing vents.
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Old 10-20-2019, 05:45 PM
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Originally Posted by alloyboy View Post
Some feel the same about two stroke carbs to four stroke carbs. A down grade.

I suppose some Luddite somewhere sees every change as a negative.

Ah for the good ole days. Carbs. With pull to choke knobs. Bias ply tires. Roll up windows. Three speed on the column shift. Wing vents.
I have replaced maybe 5 failed port fuel injectors in the past 10 years. I've replaced more than 5 DI injectors in the past year alone. I've seen high pressure pumps leak fuel into the crankcase, I've seen them outright fail. The injectors are usually not very easy to replace.
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Old 10-20-2019, 06:00 PM
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I have a little different viewpoint.
Yes there have been incremental changes, But there have not been game changing changes in the HP range you mentino.
Yea a little lighter, A little better economy, Easier to shift (FBW). But all in all. If you ung a good 2005 model on the back of a boat and a 2019 model on the same boat I doubt you would really notice the difference unless you got the FBW option.

That said, The 4 strokes are a whole lot better than the days of past that I remember. Back in the day of the black tower of power. crank, crank and more crank until it starts then rev it good to blow out carbon/oil. See it stall and repeat a second or 3rd time and go boating. Now with four strokes it is just like a car. Turn the key, let go and look at the gauges to insure it is running.

Life is good, with both 2005 and 2019 4 stroke motors

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Old 10-20-2019, 06:02 PM
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Originally Posted by alloyboy View Post
Some feel the same about two stroke carbs to four stroke carbs. A down grade.

I suppose some Luddite somewhere sees every change as a negative.

Ah for the good ole days. Carbs. With pull to choke knobs. Bias ply tires. Roll up windows. Three speed on the column shift. Wing vents.
I do miss wing windows. And roll up windows.
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Old 10-20-2019, 06:13 PM
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I'm a Suzuki fan.......
Variable valve timing.
Selectable propeller rotation
Electronic controls
Networked engine data for cruise economy and engine parameters.
Malfunction codes and read outs.
EZ service
Secondary battery charging
Longer warranty
Reliability
Oxygen sensors

Not all unique to Suzuki.....
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Old 10-20-2019, 08:27 PM
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We see lighter large 4 stroke outboards, and manufacturers continue to be in a horsepower race. 2 stroke motors are falling out of grace, and companies like Yamaha has come out with SHO model 4 stroke outboards that match up to comparable horsepower 2 stroke motors.

But my F150 Yamaha is essentially the same motor since 2007--with relatively few improvements over the years. They are simple to maintain and they're very reliable and trouble free. Yamaha really did their homework when they designed that best selling motor in its horsepower segment.
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Old 10-21-2019, 06:26 PM
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Originally Posted by Bamaman View Post
We see lighter large 4 stroke outboards, and manufacturers continue to be in a horsepower race. 2 stroke motors are falling out of grace, and companies like Yamaha has come out with SHO model 4 stroke outboards that match up to comparable horsepower 2 stroke motors.

But my F150 Yamaha is essentially the same motor since 2007--with relatively few improvements over the years. They are simple to maintain and they're very reliable and trouble free. Yamaha really did their homework when they designed that best selling motor in its horsepower segment.
That's because they used ford connecting rods
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Old 10-21-2019, 06:34 PM
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Originally Posted by NEBassMan View Post

I’d consider direct injection a downgrade. Small efficiency/power improvement at the cost of other issues.
My neighbor is a mechanic, now retired. A few years ago he told me to never buy a car with direct injection. He was frustrated at seeing how short their life span was and how often they were in for repairs. He also saw it as the future because engineers and the industry didn't care about outcome. It is fuel efficient and looks good on paper, especially with ever increasing gov't regulations.
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Old 10-21-2019, 06:35 PM
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not really - i'm still looking. I love yamaha
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Old 10-21-2019, 06:46 PM
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The biggest change in 4 strokes over the decade is the price. Other than that a 250hp is still 250hp. Until companies make a 300hp outboard that gets 10mpg at wot, it's just going to be the same ole outboard with a different cover on the top.
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