How wide is the boat? You will also need to make sure it s a 20" shaft and not the 25". Over rating by that much is not that big of a deal, but "safety" really depends on how big your boat is. My boat is rated for a 100hp, but its a 1870 and I have a 150hp on it.

 

Should be fine bud. I'll help you beef up transom.

 

Step one-check with your insurance. Mine said they didnt care what size I put on my boat, but the rate was based on HP size. You definately dont want to find out AFTER you have an accident and have an injured passenger that your insurance company wont cover you due to an oversized motor.

Also, whats the boat rated for? How wide is it? Whats this new motor weigh?

Ive got a newer 135 Opti on an 1872 SeaArk and it does just fine, but Im guessing you're gonna want to beef up that transom. Post up some pics of ya can.

 

My Fischer is rats for 90 and I have a 115 on it. My Gregor is rated for a 140 and I have a 200 on it. Beef up transom and it will be fine.

 

Ok, specs that I can google at the moment, My boat is 74inches at the beam. the new engine weighs in at 387lbs, current one is right at about 200. The hull is rated for 90hp.

 

just because you got the power dont mean you have to use it.

 

Yeah, it would be smarter not to be wfo with a full load, just up on plane and cruise. Before you nuy it take your boat out now and sit on the motor.

It would suck to get the motor and realize the back of the boat floats really low with extra weight on the transom

 

GO BABY GOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO punch it !!!!

 

what shape is your transom in? i wouldnt if i were you...thats a lot of torque on a so-so hull, youre asking for lots of trouble

 

I'm in the same situation. I have a 1652 MonArk flat bottom (72" across the gunnels) that did belong to the Army Corp of Engineers as a rescue boat on the Ohio River. It doesn't have a USCG spec plate on the boat so I have no clue what it's actually rated for. I have it stripped down to the bare hull now, but I plan to rebuild the boat soon to include a major heavy duty all aluminum reinforced transom and put a 90 Yamaha 2-stroke on it (270 lbs). I want to get the boat to plane out even with a full load of three guys, gear, and fish. Plus, this motor has electric tilt and trim which will be much better than my current 40hp tiller (170? lbs) which does not. Regardless of any rating, this boat will be nothing like it was when I finish the fabrication so handling the extra hp will not be that big of deal. The 90 horse motor will add another 100 pounds of outboard to the mix, but the addition of float pods should more than cover the added transom weight.

As was previously stated, "just because you have the power, doesn't mean you have to use it". I'm not a speed junky. I just want to be able to move the load on plane for the same reason that you do. A boat that gets rated as a bare hull with bench seats isn't a fair assessment in my opinion. When a boat gets re-fabricated, seriously beefed up and totally customized; to me it isn't the same boat anymore. I think it should be re-rated in its new form. I could see a small boat with wood transom would not be rated for much over 40hp, but a solid aluminum reinforced transom with side bracing should be rated as such. I guess I don't understand how the whole boat rating thing is formulated. Insurance companies probably go by factory specs to determine coverage eligibility. I have heard that commercial hulls don't have hp ratings. I don't know for sure. I just know that my boat does not have a USCG tag anywhere on the hull to go by.

I would put that 135 hp on there to get the performance that you need and just use the power wisely as you need it. However, make sure you build that transom to handle the additional load and weight associated with it.

 

great replies, thanks guys

 

please post a video of that thang skimmin' across the water... good luck w/ it & like most said above "beef up that transom"

 

just punch it and go......if it stress cracks...then come back and beef it up lol

 

i have a 40 hand till 3 cyl mercury and it does great on my 1752 and it will run 30 mph 4 people and all my gear genny included more than plenty for wat i want gets up on plane and goes i put a 10 pitch power prop on it so its not real fast but has lots of power and is good on fuel.

 

wow, my boat has never seen 30mph with a 50hp 3cyl merc, even with just me and my wife, to be fair my boat has a full bass boat interior three big batteries, 100lb platform, troller, and full stereo. but perhaps I could do something with the prop. biggest point being that most of the tourneys around here are total weight, so I need to be able to move some lbs. to give an idea, the guys that placed first at the last shoot, shot 1300lbs the first day and almost 1000 the second.

 

WOOHOO!

Had to make a 240 mile spur of the moment drive last night but I basically stole a pretty nice little tri hull with an AMAZING 1994 model 115 4cyl 2 smoke hanging off of it. so the heart transplant on the bass boat starts after the tourney sunday! GAS ON!

 

Had to make a 240 mile spur of the moment drive last night but I basically stole a pretty nice little tri hull with an AMAZING 1994 model 115 4cyl 2 smoke hanging off of it. so the heart transplant on the bass boat starts after the tourney sunday! GAS ON! View attachment 21442

Yes...power to the tri hull! lol
Goin tomorrow to get a 140 Suzuki for mine :hb:
Need some pics (and specs) of the boat man! :tu:

 

Here is my boat, well, here it is before I bought it, It has the bowfishing accoutrements on it now (troller, deck, ect). I think its gonna look lots better when that 115 is hanging off the back of it! On a side note, anyone want a 16ft tri hull with a 50 merc for CHEAP?

 

I'm looking to buy a motor for my grizzly 1860 CC, if you want to sell just the motor send me a PM with the info and shipping costs. If I don't find a good used motor by next month, I'm breaking down and buying a new one from Bass Pro

 

And that 140 Zuke will scream, I dont care what boat you are putting it on it will be FAST

 

If it sits to low, get some pods.

 

Woohoo! she is fast, really fast. As soon as i get some trim issues worked out and a calm day on the lake i will report back on how fast. but i do know that after I smoked the prop on a giant rock that it was in the mid 40s on rough water. and like i said, that was with half a prop.

 

What kind of trim problems u got? I have the same outboard and have done alot of work with the trim system. Let me know if u have any questions , and I have some spare parts if you need them.

 

trim problems stem from the fact that the motor came with a bad power trim ram, which was not installed at the time but the guy handed it to me. Well the mounting brackets from the 50hp and the 115 were "exactly the same" so I decided to swap the power trim from the 50 over, well i missed one minor aspect of the swap and that was where the ram mounted in the top to the upper motor clamp bracket. on the 115 single ram system it is offset, and the 50 three ram it was directly in the center. I have found a manual trim unit for the 50 so my plan is now to swap out the brackets and use either the entire bracket from the 50 or just the upper portion of it. It seems as though it is going to be a giant PITA to do the swap but the time seems worth the money.

 

First check with the dealer! 1. Insurance Com. may not insure the boat with that size motor! 2. u.s.c has a frormual. all boats are not rated for the same size motor, even though, they are the same size boat. I ran into that problem with a bass boat! What does your plate on the boat say for max horse power?