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XTO 425 - Who has re-powered?

Old 10-20-2020, 09:53 AM
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Default XTO 425 - Who has re-powered?

So I am looking to repower my boat in January from twin Yamaha 350's to twin XTO 425's. My boat is a 43' customized Maxweld monohull. It is super heavy. It currently has twin 350's on it and it struggles to get on a plane. I've been researching alot of the performance bulletins plus shipyards that have done the repower. I am having a hard time finding data on what the performance of a boat was before the repower and what it is after the repower. I am hoping some folks here can help fill that gap. Additionally, are you happy with the repower?

I know there are alot of posts about the weight and/or the price. Not looking for feedback on that. The weight is no issue for my boat and I can't run trip 300's, the transom isn't setup for that. Really just looking for some real life feedback on these motors and what a before and after feedback was from people that repowered to these.

Thanks in advance!
Old 10-20-2020, 10:31 AM
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I almost went that route. If your transom is tall and the noise of the 350’s don’t bother you, then those 425’s seem like a perfect match for your application. The 425’s I test drove at boat show were very loud. Noticeably more than the 350’s. Seems cost is close to 100k when it’s all said and done.

Old 10-20-2020, 10:34 AM
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Originally Posted by Extractor View Post
I almost went that route. If your transom is tall and the noise of the 350ís donít bother you, then those 425ís seem like a perfect match for your application. The 425ís I test drove at boat show were very loud. Noticeably more than the 350ís. Seems cost is close to 100k when itís all said and done.
My boat is a bit different in design than most. It has a 6' custom offshore bracket that is about 3-4' lower than the main deck. That muffles the sound. I can barely hear the 350's on the back until they get to wide open. You are pretty close on the price estimate. I'm a hair over that, cause I have dual stations with the helm master.
Old 10-20-2020, 11:05 AM
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Please post pictures of the boat. I would love to see it.
Old 10-20-2020, 11:15 AM
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Originally Posted by Js139 View Post
My boat is a bit different in design than most. It has a 6' custom offshore bracket that is about 3-4' lower than the main deck. That muffles the sound. I can barely hear the 350's on the back until they get to wide open. You are pretty close on the price estimate. I'm a hair over that, cause I have dual stations with the helm master.
Please shoot us a pic of your boat.
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Old 10-20-2020, 11:55 AM
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I was trying to post a picture, but it won't let me since I don't have enough posts.
Old 10-20-2020, 11:56 AM
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I guess I am too new at this.
Old 10-20-2020, 11:57 AM
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This is my last one. I'll post a picture shortly.
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Old 10-20-2020, 12:36 PM
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I wouldnít go Yamaha at this power level, I canít justify that weight increase.

Mercury 450 is the ticket. More power/less weight.
Old 10-20-2020, 12:46 PM
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Originally Posted by leoaa777 View Post
I wouldnít go Yamaha at this power level, I canít justify that weight increase.

Mercury 450 is the ticket. More power/less weight.
I have to disagree. I'd rather have a naturally aspirated 5.6L V8 pushing a large heavy load than a 4.6L forced induction. Just me though.
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Old 10-20-2020, 12:48 PM
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Originally Posted by leoaa777 View Post
I wouldnít go Yamaha at this power level, I canít justify that weight increase.

Mercury 450 is the ticket. More power/less weight.
As big a fan of Merc's new technology as I am I think the OP will be better served with the Yamaha truck engines for his truck.
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Old 10-20-2020, 12:57 PM
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Plus, the 425 sounds like a bog block Chevy! Delivered a boat with twins. AWSOME sound and performance!
Old 10-20-2020, 01:23 PM
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Originally Posted by jjc0009 View Post
I have to disagree. I'd rather have a naturally aspirated 5.6L V8 pushing a large heavy load than a 4.6L forced induction. Just me though.
I would agree - 450R seems to me to a an engine built for the polar opposite of this.
Old 10-20-2020, 01:32 PM
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The 450R beats the 425hp Yamaha in Torque and HP at every RPM point.

The same way the Ford Ecoboost 3.6 liter blows away the 5.0 liter NA as well.

The V8 is a beast like nothing else. A 275hp Verado has more boost running through it then the 450R.
Old 10-20-2020, 01:59 PM
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Originally Posted by captbone View Post
The 450R beats the 425hp Yamaha in Torque and HP at every RPM point.

The same way the Ford Ecoboost 3.6 liter blows away the 5.0 liter NA as well.

The V8 is a beast like nothing else. A 275hp Verado has more boost running through it then the 450R.
Correct, some guys just canít see past the Yamaha name. Nowadays Mercury is the name in power.

Suzuki is the name in bang for buck.


Old 10-20-2020, 05:18 PM
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Originally Posted by leoaa777 View Post
Correct, some guys just canít see past the Yamaha name. Nowadays Mercury is the name in power.

Suzuki is the name in bang for buck.
Yes, and Yamaha is still the name in reliability.
Clearly itís their focus as well if you look at their website.

Power, reliability, price. Pick 2.



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Old 10-20-2020, 06:26 PM
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Originally Posted by 69Mach390 View Post
Yes, and Yamaha is still the name in reliability.
Clearly itís their focus as well if you look at their website.

Power, reliability, price. Pick 2.


look up the issues with the 425. Itís all about reliability......until the 300 hp mark.
Old 10-20-2020, 07:53 PM
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Seems like you have the exact boat the 425’s were made for. Should be an easy decision. They have been out long enough and on enough transoms that any major issues would have been reported.
Old 10-21-2020, 10:05 AM
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Thanks Everyone for the feedback. Sorry I didn't get this up sooner. Turns out I'm limited to 5 posts per day. I didn't know that as a newer user. Anyways, here is the picture of my boat. As you can see, the noise doesn't make it up to the boat and not a concern. Also, the weight of the motors is a non-issue. The boat needs a little more weight in the back to level it out. So again, no issue. As noted in my original post, I believe the Yamaha is the right motor for this boat. I'm just trying to see what performance gains I would get with the change, hence looking for people who have repowered and what their gains were. I've seen the post from Bayweld in Alaska that repowered a 39' CC from twin 300's to twin 425s, and I believe my gains will be similar to that boat. That said, I was just curious what other real life owner examples looked like.
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Old 10-21-2020, 10:29 AM
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Sorry I have no real world advice. I do understand your concern. On paper it's only a 150HP improvement for 100k. Are your 350 still running well.

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