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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 09 Jan 2018, 10:35 

Joined: 18 Jan 2016, 11:23
Posts: 68
Location: ND
I have a 20hp Mariner on a Lund 14' now and I am thinking of going to a 4 stroke 20 Suzuki or Tahatsu. With this boat set up the way I like it now I get 23 mph. Plenty for me. Question is would I lose anything by going to a 4 stroke? To me a 20 is a 20 but I've heard the 4 strokes don't have the power? Thanks, Jim


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 09 Jan 2018, 10:43 
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Joined: 31 Oct 2017, 05:38
Posts: 144
Location: Joliet, IL
The 4 stroke will be heavier. If everything else is the same, you will lose a bit of top end speed due to the extra weight. Your gas mileage will improve, and your wallet will be lighter for the money you spent on a new motor.


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PostPosted: 09 Jan 2018, 11:10 

Joined: 12 Mar 2017, 12:09
Posts: 490
Be a little heavier. Top speed should be very close but the two stroke will eat the four strokes lunch getting up on plane. But either the four, you’ll have money left for lunch at the gas station and it’s quieter, nice especially if you troll a lot.


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 09 Jan 2018, 11:34 

Joined: 18 Jan 2016, 11:23
Posts: 68
Location: ND
No idea what my Mariner weighs but I see the Suzuki is advertised at 97# and I should be able to get by on a 3 gallon tank rather than the 6 My mariner takes. Always like to start with a full tank even if I don't need it LOL. That should make up for the weight change. Mostly interested in the power. I like the idea of the quite 4 stroke. Not sure which motor is the better of the 2. I don't see many of either in the waters I fish. Mostly Mercs and Yamahas around here.


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 09 Jan 2018, 12:52 

Joined: 06 Dec 2014, 13:20
Posts: 26
Location: Central Illinois
You need to check out the new Mercury 20 hp 4 stroke. It's built by Tohatsu so its light weight but it has a lot of interesting features.


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PostPosted: 09 Jan 2018, 19:43 
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Joined: 05 Jan 2016, 21:50
Posts: 378
You will lose some speed due to the motor being heavier However the four stroke should be A lot quieter than the 2 stroke. If you're worried about it step it up and get a bigger 4 stroke

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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 10 Jan 2018, 08:54 

Joined: 07 Mar 2011, 19:58
Posts: 2462
Location: Harrisonburg, Va.
youll lose top end speed, 4 stroke very heavy. the power to weight ratio of a 2 stroke is great.



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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 10 Jan 2018, 09:40 

Joined: 18 Jan 2016, 11:23
Posts: 68
Location: ND
Just found the specs on my motor online. The 1988 mariner 20hp is 107# so the Suzuki is 10# lighter. Still cant decide. 30 years old and no problems. Wonder if I can get that out of a new 4 stroke. There isn't anything wrong with it now but I would like something quiet and maybe electric start. Getting older and not so easy to pull over. As far as a starting battery a motorcycle one would work and they are not all that heavy so that extra weight would make it about the same as the Mariner. Figure if it will start my Goldwing it would start a small 20 hp outboard. Just looked it up and see the Suzuki 20 with electric start is 106# so real close to the Mariner.


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 10 Jan 2018, 10:39 

Joined: 13 Nov 2014, 08:01
Posts: 686
Your old motor still works good, so it can get good price on used market.

10 years from now you will be glad you made the change.

It won't get any cheaper.


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 10 Jan 2018, 11:04 
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Joined: 31 Oct 2017, 05:38
Posts: 144
Location: Joliet, IL
On a smaller motor, it may not be as much of an issue, but when I bought my new electric start 35hp Tohatsu a year ago, I was warned about using too small a battery to start it. The electronics in new motors are pretty sophisticated and require strong steady power. Check with your dealer and manufacturer to see what size battery to use. You wouldn’t want to fry the computer in a new motor.
As an older guy myself, electric start was a requirement for me as well as power trim. Trying to pull start a 20hp or bigger 4 stroke is not something you want to do frequently. If you are going to repower, don’t try and save a few dollars by not buying the biggest motor your hull will allow. For resale value alone, a bigger motor makes it much easier to resell.


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 10 Jan 2018, 12:33 
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Joined: 17 Apr 2014, 15:39
Posts: 512
Location: Cullman, Alabama
Is the Suzuki fuel injection? That would be nice to have as well.



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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 11 Jan 2018, 13:22 

Joined: 06 Dec 2014, 13:20
Posts: 26
Location: Central Illinois
The new 20 hp Mercury, Suzuki and Tohatsu are all as light or lighter than a lot of the old 2strokes. They also are fuel injected so they should start easier, run better, quieter, maybe faster than the old 2smokes. Things have changed in the last couple years.


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 11 Jan 2018, 18:19 

Joined: 18 Jan 2016, 11:23
Posts: 68
Location: ND
That's what I was thinking and hopeing. Faster or at least as fast and lighter. Like the idea of not having to mix fuel and the quite of the 4stroke. Would be nice if the dependability was there to. Anyone change to a 4 with the same horsepower as the 2 stroke? How did it do?


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 12 Jan 2018, 18:59 

Joined: 06 Dec 2014, 13:20
Posts: 26
Location: Central Illinois
The Tohatsu and Mercury are brandnew but check out posts by fellow member Scobeb on the Suzuki. Very interesting.


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 Post subject: 2 stroke to a 4 stroke?
PostPosted: 14 Jan 2018, 08:46 

Joined: 31 Jan 2017, 19:25
Posts: 14
One other advantage of the 4-stroke is no more mixing oil and gas.


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