Lund max engine weight

[Underblog]

I’ve got a 2001 Lund Pro Sport 1600 with a 70hp 2 stroke Johnson. I’m thinking of upgrading to a 90hp 4 stroke, but I’m concerned about the weight. The Lund is rated for a 90, which for 2001 weighed 319 lbs. A new Yamaha 90 4 stroke weighs 353 lb. Will that extra 34 lbs stress out the transom on the Lund? Does anyone have experience with this kind of an upgrade?

Eric

Burntside Lake, MN

 

[Lightwin 3]

Your Johnson weighs about 250 +/-.

Your transom can handle the extra weight but you may have to move things around (batteries, etc.) if you are stern heavy after the install.

Are you using a trailering bracket/brace? If not, you need one.

 

[5150abf]

Also now would be good time to really inspect the transom, at 17 years old it may need attention especially if you are stepping up in HP.

If there is any wood I would take a close look at it, you should be able to stand on your cavitation plate and gently bounce with very little movement.

The weight of the motor hanging is miniscule compared to the force it applies to the transom at full throttle, that is in the thousands of pounds.

 

[roscoe]

If transom is sound, you are good to go.

But check it out first. Lund had a number of model years in the early 2000's, where inferior materials were used, and transoms rotted away.

Check with the guys on WalleyeCentral.com for details.

 

[Chris1956]

The weight difference between the two motors is not important. Boat HP capacity is the important factor, IMO, as that stresses the hull much more than motor weight..

As an experiment, consider the following: Your weight is much more than the difference between the weight of the two motors. If you can stand in the stern area of the boat, and she doesn't get close to swamping, you have the ability to have a heavier motor. Of course this is with the understanding that the boat is rated for the extra power.

 

[ahicks]

No matter the rating on the boat, unless it's an unusually wide boat I guess my concern would be how the boat sits in the water with that kind of weight on it. Will you be able to get the battery and tank far enough forward to effectively counterbalance? Not unless you make a set of custom battery cables and fuel line.

I'd hold off on that combo. 18' boat would be a different story. My thoughts anyway.

 

[82rude]

Would not concern me atall.Have you thought about the f70?

 

[Underblog]

These are all very helpful comments, thank you. I’d like a little more oomph than the 70 that is on there. If I’m going to go to the trouble of putting a new motor on, I think I would like to go as big as possible. It is rated for a 90hp. The only trailering it gets is if it needs something done at the shop. Otherwise, it goes into the lake for the season, and out at the end of it. The tank is already forward (built in), and it has a place for a second battery up front; might be able to move the primary battery up there.

 

[JimS123]

Nobody here can answer your questions reliably. Adding the extra weight is surely a question that needs to be answered. Merely saying "no problem" is an uninformed guess.

Why don't you just call Lund and ask their TS department. Maybe a conference with their engineering department is in order.

What you want to do to an antique boat with unknown condition surely needs a lot of study...

 

[5150abf]

Get it on and get the boat wet, that is the only way to tell what it is going to do, it may sit fine and you won't have to do anything, your talking 40 lbs, I don't think you even notice a difference, might sit 1/4'' lower.

I

 

[82rude]

In 2001 Yamaha had a 80hp 4 stroke ,it weighed 358 lbs.so does your lund say no 4 stroke motors at max?No it does not so in 2001 you could of had a 80hp Yamaha on it!The new 90 weighs less so if your lund is healthy and solid a 90 4 stroke is fine.

 

[cassabby]

I am with the get it on and get it wet. If your transom is sound that 1600 Lund should handle it fine. Use your common sense I just posted in another forum that I am running a Force by Mercury 120HP on a 1988 Crestliner V1500 Mirage for now 19 years with absolutely NO ISSUES! I am not pulling skiers just Walleye and Pike fishing. I did need to set Motor mount 3rd hole from top to eliminate porpoising. Troll Batteries are up front.