Mercury 90hp. Or Yamaha 90hp. 2-Stroke ? Pros / Cons

**Cougarman46** · 04-04-2017, 02:41 PM

So would you fella's buy the reman?

Or just shop for a good used 90, if the mid
Is going to get cut to 15" anyways?

Also have any have you done the 15" mid
Conversion... or had it done?
Who do you like to lean on?

Really appreciate everyone sharing too!
So thank you!

**FMP** · 04-04-2017, 04:00 PM

cool , that will move with it

**Jason Johnson** · 04-06-2017, 12:41 PM

CCM reeds, shave intake .030, light porting, compression @ 160psi. 7400+ rpm and last forever.

**Cougarman46** · 04-06-2017, 02:30 PM

Originally Posted by Jason Johnson

CCM reeds, shave intake .030, light porting, compression @ 160psi. 7400+ rpm and last forever.

How much power with those specs?

**Ira Tindale** · 04-09-2017, 04:55 PM

merc

**Jason Johnson** · 04-10-2017, 12:05 PM

No clue, I can turn a 24p Yamaha drag mid 7000rpm. Never seen a dyno.

**Mr. Demeanor** · 04-11-2017, 01:21 PM

That boat would probably float a V4 Yamaha and that would take it to a new level.
About 80 pounds heavier than a 90 Yamaha and you could get that difference down. My short V4 Yamaha weighs 298lbs vs a stock 90 at 260 lbs.

One thing you want is a fresh water motor. Yamahas do have worse corrosion issues. Pulling a head will reveal a lot.

**Cougarman46** · 04-11-2017, 03:54 PM

Originally Posted by Mr. Demeanor

That boat would probably float a V4 Yamaha and that would take it to a new level.
About 80 pounds heavier than a 90 Yamaha and you could get that difference down. My short V4 Yamaha weighs 298lbs vs a stock 90 at 260 lbs.

One thing you want is a fresh water motor. Yamahas do have worse corrosion issues. Pulling a head will reveal a lot.

Mr. Demeanor,

I have read your entire thread over the past year.
You clearly have put your dues in not only with the Yamaha, but also with the small boat in front of it.

The more I research, along with the responses to my own thread the 90hp. Is spoken very highly of in regards to
Possibly one of Yamaha's best engines.

In your opinion, other than just speed.
Inline-3 90hp vs. V-4 115hp what are the advantages
of either?

Just looking at the whole picture from
Dock manners, to idle, stress of either,
Obviously V-4 has less stress with the added
Cylinder, Etc. Etc.

Thanks
Jon

**FrenchPhil** · 04-12-2017, 03:26 AM

Jon, what are your hull specs ?

**Markus** · 04-14-2017, 05:32 AM

Yamaha.

Or Tohatsu.

But the Yamaha is the best engine in that class.

**charlie the wonder dog** · 04-14-2017, 07:01 AM

Not sure if you've found this thread, but if you're looking for a short mid it sounds like the 1980s Mariner could be a good donor.

http://www.screamandfly.com/showthre...+55+midsection

**Cougarman46** · 04-14-2017, 02:50 PM

Originally Posted by charlie the wonder dog

Not sure if you've found this thread, but if you're looking for a short mid it sounds like the 1980s Mariner could be a good donor.

http://www.screamandfly.com/showthre...+55+midsection

Thanks for the link, helpful info

**Jason Johnson** · 05-09-2017, 03:50 PM

Click image for larger version.

Name: IMG_6664.PNG
Views: 96
Size: 1.39 MB
ID: 374652

DO NOT GO WITH A MARINER MID. It is not worth the trouble that it takes to get the water pump in the Mariner mid. A cut stock is the way to go. Green boat is a mariner mid, yellow boat has a cut 20" Bring me the whole rig, I'll fix you up.

**aeneas** · 05-09-2017, 04:43 PM

Yamaha.

I had a Yamaha 90 that was well worked. In retrospective all that work should have been done to a Yamaha V-4 (100-140). On your boat - it would be another level! It would be the engine that boat deserves!

**Mr. Demeanor** · 05-09-2017, 09:43 PM

Originally Posted by Cougarman46

Mr. Demeanor,

I have read your entire thread over the past year.
You clearly have put your dues in not only with the Yamaha, but also with the small boat in front of it.

The more I research, along with the responses to my own thread the 90hp. Is spoken very highly of in regards to
Possibly one of Yamaha's best engines.

In your opinion, other than just speed.
Inline-3 90hp vs. V-4 115hp what are the advantages
of either?

Just looking at the whole picture from
Dock manners, to idle, stress of either,
Obviously V-4 has less stress with the added
Cylinder, Etc. Etc.

Thanks
Jon

In short, theres no replacement for displacement. You may make a 90 into a 115hp engine but it will never accelerate like a 115 just like my V4 that is probably 175-200hp will never pull like a 200hp V6. The fun factor will be huge with the V4.
The V4 also has a better gearcase and you can bolt a V6 gearcase to it. Everything below the powerhead on a V4 is the same as a V6 so you have a lot more parts out there. Plus you can always drop a V6 powerhead on it :-)