Motor Setup Need Advice

[Garner2204]

I'm running a 1548 Weldbilt tall transom with a 25 Tohatsu long shaft 4 stroke, with factory tilt and trim and a CMC BA130. I have them raised up as far as I can go, and I am still 2 inches below the bottom of the transom. With the motor trimmed all the way down it sprays water badly, when I trim it up a little the boat starts to hop. Batteries are sitting in the front of the boat to help with weight. I want to raise the motor but I don't want to add to the setback(short arms). Also it needs to be stout, I run in shallow water with stumps and logs present.

 

[Bondo]

Ayuh,.... Welcome Aboard,.... What yer describin' is exactly what happens when ya mount a 25" motor on a 20" transom,....

The Best answer, is to trade yer motor, for one that actually fits yer hull,....

 

[Garner2204]

Well that's unfortunate. Thanks for the reply.

 

[shrew]

Most Tohatsu's, like most motors, come in Long Shaft and Short Shaft

Long Shaft = 20"
Short Shaft = 15"

The WeldBilt 1548 has 20" of freeboard on the side. I suspect, as stated by Bondo, that you need a short shaft for that transom. Most utility boats use short shafts. Long shafts are used by sailboats.

 

[flyingscott]

Take a pic of the back of your boat with the motor on it. Up close where the cavitation plate and keel are.

 

[ondarvr]

You can raise it up higher, use a sheet of aluminum on the inside and outside of the transom, then sandwich a piece of plywood the correct thickness between them. The aluminum also sandwiches the old transom and is through bolted like the motor was. This just raises the motor as needed and doesn't move it back.

 

[Garner2204]

To make sure its clear, you have an Extra long shaft motor (25in)

I didn't even know they made those. I was under the impression that I was getting a long shaft motor. 20inch shaft for a 20 inch transom.

 

[jbcurt00]

To make sure its clear, you have an Extra long shaft motor (25in)

I didn't even know they made those. I was under the impression that I was getting a long shaft motor. 20inch shaft for a 20 inch transom.

I apologize and will change my post. I read your post as 25in Tohatso, not a 25 Tohatso.... sorry about that. Bondo was also thinking you had a 25in Extra long shaft.

How about we back up an ask whats the model# on your 25 Tohatso? That will help, as will some pix.

Post some pix of your setup
Pix help
http://forums.iboats.com/forum/forum...pload-tutorial

Easier to delete my post and start over....

 

[Garner2204]

No Title

This is with it trimmed all the way down. Model number is mfs25c

 

[jbcurt00]

Any letters after the "c" in the model#?
MFS25c came in 7 variations, none 25in shafts.

Looks like your motor is at least 3 or 4in low based on the setback.

Side view pix?

 

[ondarvr]

The pic was so dark on my screen I couldn't really see it.

 

[Garner2204]

I'll take more tomorrow.

 

[roscoe]

So you have a setback/breakaway cmc.

It should be mounted up as high on the transom as is physically possible.

"Tall Transom" means nothing.

What is the actual height of the transom? 16" 21" ????

 

[Garner2204]

20 inches

 

[Sea Rider]

That's a swivel bracket clamp OB right ? What's a CMC BA 130 ?
What's 2 inches below the bottom of the transom, you mean the AV lower plate ?

Happy Boating

 

[bonz_d]

So you have a setback/breakaway cmc.

It should be mounted up as high on the transom as is physically possible.

"Tall Transom" means nothing.

What is the actual height of the transom? 16" 21" ????

Also need to remember the farther the setback the higher the engine needs to be.