This is by-far one of my favorite threads. It gave me some really good laughs and still is.


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So what you're laughing about is i need to get me a merc? Got news for ya the older 2 stroke Tohatsu when built and probably run faster then the mercs that are built

Get your bloomers out of a wad and read the whole thread and hopefully you will understand. And just a little FYI the older tohatsus won't out a Merc.


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The 50 doesn't have a restrictor. The 40 and 50 share the same block so the 50 is restricted to make a 40.

You're saying the carbed 40 tohatsu can be hopped up to make more power than a carbed 40 mercury?

What do you honestly think the 40 2 stroke merc will produce Max horsepower after you do the 60 carbs and all?

Like I said this is my favorite thread. It can make laugh no matter how bad of mood I'm in.


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A 40 tohatsu is 45 cubic inches and shares a block with the 50 tohatsu, so the biggest carburetors that can be put on are from a 50. Put the 50 carbs, intake and exhaust and you have a 40 making 50 hp. Got to do port work to get higher. A 59 cubic inch 40 mercury shares a block with a 50 and 60 mercury. Bolt on 60 carbs and intake and you have a 60 hp motor without touching the internals and it makes more torque than a 45 cubic inch motor.

Both are fine motors, but the mercury has more potential.

Thanks Scott, I'm gonna end it here before it gets outta hand and becomes a pissing match here. Some people are hardcore merc people but from my research I think maybe a tohatsu can probably produce more then a merc. This I heard from people who are hardcore racers that race mercs who have even said it may come to a point they will switch to a tohatsu because they produce more to win races

Nobody pissing over here. Lol


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Ok. I really don't think you can go wrong with either motor, just whatever you're looking for.

I agree there both great motors

no replacement for displacement .......who has more cc Merc or Tohatsu? I don't run either one but if I was a betting on one I know which one I would pick to win a race.

And Danny T would build it for me. :D

+1

The merc is 59 cuibic inches and the tohatsu is 42.4. Only reason tohatsu dominated Formula 50 was the 45 cubic inch restriction, as in all professional boat racing. My Formula 50's best run was 82.7 mph, a stock 50hp tohatsu. The comparable motor to the 59 cubic inch merc would be the SST60, OMC motor, their kilo record was about 95 mph. 12.5 mph is lightyears difference between boats already tweaked to run.
D

so a man of your knowing, if you could have a brand new Merc 40 or Tohatsu 40 which would you choose to use for a platform to build from?

That's for sure.

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You talking bout the 3cyl 2 stroke Mercs they don't make anymore.


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yep both of them being the older style 2stroke 3cylinder 40hp

Then that's an easy decision.


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that question was directed at someone that has dealt with both and who would know...... not assume from what they have heard;)

You have an uncle that got rid of a brand new tohatsu for a Merc because his brothers Merc would run circles around his tohatsu.


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There is no replacement for displacement! If I had a choice of either of those motors, the Black motor would be mine without a second thought.
D

Agreed X100000000000000


+1


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so when you gonna bring yours to someone and get it fixed

gots me one of those...been a good motor

M40C
 

I have a M40C Tohats 40 hp, single carb model, Just completely rebuilt by Jerry's Marine in Gonzales,La. My question refers to getting more punch from it. From what i am reading all i need to do is Swap carb, reeds and exhaust and essentially i have a 50 hp? I am mechanically inclined just not very knowledgeable on this motor yet... thanks for ll y'alls help..... Oh and we cought some reds this past weekend in haymark fishing gulp under a popper off the marsh cuts. Cought between 9AM and 11AM each day

Corey D

Not really, you have a M40C, that C designates it as a 2 cylinder outboard. Everyone else is talking about the M40D converting to a 50. The D designates that motor as a 3 cylinder.
Your M40C is a 29 cubic inch, 2 cylinder, single carb, Japanese commercial fishing motor.
The M40D is a 3 cylinder, 3 carb, 42.5 cubic inch recreational use outboard.

The first class I raced was Sport "C", the C designated the max cubic inch allowed was 30. The 2 cylinder Tohatsu dominated that class. The fastest I ever got mine to run was 60 mph. That is with a total, after race, weight of 650 pounds.
Look up Sport C on youtube.
D

info
 

Yeah.. after posting that i went and started referencing parts and realized they do not match up! So what options do i have with my C, if any???

Corey

So a 1994 M40D can be turned into a 50 hp?

What kind of cost is involved in that? Is it worth it to do to a 19 year old motor. My coworker has one.

For a little while I was thinking this one would end up in the gill net

Yes it can, but, I would guess that corrosion has gotten the better of that motor. Nearly all of the Megas have had block replacements, they were 93 models. It started about 4 or 5 years ago. The block corrodes around the sleeves so badly, the head gasket won't seal. All of the water jacket cover bolts break off when you try to remove them, makes it kinda futile to spend that much money on a unit with a very limited life span.
D

Options
 

So to those of you who know about these tohatsu's, are there any options for my M40C? Or is it pretty much where its gonna be... im hoping for some way to squeeze a little more out of it, i have a lot of money in it now.

Corey

PM sent.
SD