Mercury 90hp to 115hp

[Algarve]

Here again,
A big hug to everyone on this side of Atlantic.

My question is:

Is it possible my motor Mercury 90hp elpto 2 strokes 1997 be change and reprogram to 115hp?
I ask this because it seems to me that the block is the same and cc.

If yes how to proceed?

 

[Kawasaki]

Dunno with a 97 engine
But did it with a new 90 hp I bought in 89
Just changed carb jets
On your side of the pond
Go to Boats . net
And dive into the 'Mercury parts Forum' unless you already have!

 

[jfm]

Here again,
A big hug to everyone on this side of Atlantic.

My question is:

Is it possible my motor Mercury 90hp elpto 2 strokes 1997 be change and reprogram to 115hp?
I ask this because it seems to me that the block is the same and cc.

If yes how to proceed?

This is not possible on a 1997 2 stroke because that is the 3-cyl model and 90hp is the max power that engine was sold in. There are no original carb jets available to take it to 115hp. The 115hp engine was 4 cyl in the 1997 model year, so you'd kinda need to add an extra cylinder to your 90...

I dunno where you got the info that 90 and 115 1997 2-strokes are the same block. They aren't.

If you need more power then I'd suggest get a different engine. Both the 3 cyl 90hp and the 4 cyl 115/125hp were not particularly good engines in any case, imho (I have a 125hp 4 cyl currently).

 

[Rum_Pirate]

The 2 stroke 75 and 90hp are the same EXCEPT for the Carb, the stickers on the cowling and the timing.

I know this as a mercury agent (now no longer in business) sold the previous owner of my boat two 90hp's.

The block had a connecting rod come through the side.

When I quoted the serial # to obtain a replacement block, Mercury told me it was a 75hp.

The B<gger of a dealer had changed the carbs and the stickers on the cowling but forgot the timing, but did not disclose what he had done.

I asked Mercury if they condoned this dealer change without disclosure to purchaser and they went silent. They did come up with quite a few freebees including a new electric trim.

IMHO Mercurys are really freshwater engines and not meant for salt water, so it seems to my boating friends who virtually to a man prefer Yamaha.
I replaced my Mercraps with two 85hp Yamaha's last year.


I cannot advise on the new Mercurys, including their bigger VERADO hp engines
http://www.mercurymarine.com/engines/outboards/verado/

 

[jfm]

The 2 stroke 75 and 90hp are the same EXCEPT for the Carb, the stickers on the cowling and the timing.

Yes, but only for certain model years RP. There are model years when 75 and 90 are completely different

 

[Rum_Pirate]

Yes, but only for certain model years RP. There are model years when 75 and 90 are completely different

Accepted. I can only confidently speak in respect to the models produced for the 90 and 75 of my (former) engine vintage circa late 90's.