YAM 360S form 5hp to 20hp and adding seats and steering console

[Naishman]

As a newbie, see: Yam 360S with Johnson 20hp from the Netherlands I will show here all things I have done (or gonna do) to make our SIB more comfortable and with more power.

after several trips we decided we would like to have more comfort aboard, and I would like to have some more speed so we can pull a tube or something.

As bought with the 5hp we get a speed of 10 km/hr with all 4 in the boat, nice for some cruising around and the day trips

But a little more speed would be more fun (for me anyway ).

With only me in the boat, I could get it on the plane with some weight shfting to the bow and then back when it was down but still hard to achieve.

So I bought a 'not running' Johnson 20hp for a few bucks:

after just a half hour I had it running:


And that means I also had to try it on the boat, have been on the water for about half an hour adjusting and testing and was happy with the result.
Speeds was over 30km/hr so that felt good enough.

Here with the 20hp on the tail:

After that run I swapped the 5hp back on it there I want to touch up the 20hp.

[Naishman]

After that the 20hp has run on the boat and the 5hp was back on the tail I started with upgrading the SIB.

Idea is to install seats ans a steering console.
After some hours with google I had several ideas and some dimensions so I started drawing what I had in mind.

I first measured the SIB so I could see how it would look like with the installation.
So with Tinkercad I made it more visual.

The steering console, with 25ltr tank, the tank has move aft a little because later I will install a battery in front of the tank:

And how it would look like:

So I started with the frame for the console, all aluminium 20x20mm:

And steering control installed:

When the frame of the console was ready I installed it to the alu floor:

Here are the seats already installed, these are placed on a aluminium frame:

And connected the Mariner to the steering and throttle/shifting control:

In this set up we have been on the water and are very happy with it.
The console is made so that steering can be done while seated (off course) and standing up.

So now we are satisfied we can carry on with the upgrade.

[warder54]

Nice job!

[Sibfisher]

Like it looking very good

[Limecc]

Hi Naishman, top marks you've really done a great job. Can't help wondering if the overall handling of the boat would be improved by bringing the console forward? I realise foredeck space is a premium on such a small boat but even so, it's important to get up on the plane early and use those 20 horses to the full.

I miss the jockey seat of our old boat. Pros and cons but now I need a third hand to hang on at times. Depends on your boat usage I suppose.

[Naishman]

Thank you Sibfisher and Limecc.

Due to the fact that I do not have a certificate at the moment the speed is limited till 20km/hour.
This means if I am alone in the boat I do not get it in plane without moving myself to the side of the console till the nose comes down, after that I can sit and relax in the back seat.

If I am with my son, I let him sit in the console seat till we are in plane and than he can sit next to me.

But off course I tried it without limiting the engine, then i can stay seated, the nose comes up, then the outboard pushes it over it`s own wave and the nose comes down and the boat accelerate to +35 km/hour.

in the console is the 25ltr fueltank and during the winter when the outboard will be fitted with electric start there also will be a battery in front of the fuel tank.

Also the console weight is in front which helps a lot, without the console the nose came up a little more.

Handling is much better then steering directly on the engine, especially because you now can sit normall and relax during the trips.

[Martin]

Hi Naishman, wow.. you’ve been a busy chap… great job !!!
I’m curious, is all that permanently fixed or can you remove it quickly and still pack the boat away to put in your boot/trunk?

Martin

[Naishman]

Hye Martin,

For the trips here in the Netherlands I have a normal road trailer and all will be stay mounted as is.

But because we will go on holiday in Croatia for 2022 and the SIB has to go on top of the car it all can be removed easily with just about a screw or 12.
I have installed threaded inserts in the aluminum floor.

Best regards,
Berto.

[Naishman]

Sounds like you've got that well set up for your needs..
Great stuff

Martin