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34 yellowfin w/ twin mercury Verado 400ís

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34 yellowfin w/ twin mercury Verado 400ís

Old 03-17-2019, 11:12 AM
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Default 34 yellowfin w/ twin mercury Verado 400ís

Would anybody have performance numbers for. 34 yellowfin with 400 Verados? Not the 400rís, just the regular 400ís.
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Old 03-17-2019, 11:37 AM
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Originally Posted by Turtle208 View Post
Would anybody have performance numbers for. 34 yellowfin with 400 Verados? Not the 400rís, just the regular 400ís.
Would be almost identical to the 400r performance. 6800rpm in the production 400 versus 7000rpm with the R. That would not be the ideal twin setup for that boat. The only difference in the 350, 400, and 400r is the calibration (6400, 6800, 7000 WOT respectively) so unless you plan on running everywhere at 6600+ rpm, you wonít see any real gains over 350s.
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Old 03-17-2019, 11:37 AM
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The performance numbers I have see put the 400M within 1mph of the 400R.

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Old 03-17-2019, 12:15 PM
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I do long canyon runs full of fuel and gear and currently have twin Yamaha f250...needless to say it struggles to get out the hole...looking to repower with twins...what would you all recommend
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Old 03-17-2019, 12:38 PM
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Originally Posted by Turtle208 View Post
I do long canyon runs full of fuel and gear and currently have twin Yamaha f250...needless to say it struggles to get out the hole...looking to repower with twins...what would you all recommend
I have run that exact boat for 8 years with twin F350s and it performs very well. The YF34 was originally designed around that twin F350 platform. As you probably know, though, that motor has had problems, but I don't know if the more recent generations have had the same issues as the early ones. I would prob not go twin Vrod 350s b/c not enough mid-range torque (small displacement supercharged engine). Can you do trips or needs to be twins?
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Old 03-17-2019, 12:39 PM
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Originally Posted by Turtle208 View Post
I do long canyon runs full of fuel and gear and currently have twin Yamaha f250...needless to say it struggles to get out the hole...looking to repower with twins...what would you all recommend
Yamaha 425s (if you can get them)
Suzuki 350 duo props (if you have local service support)
Mercury 400 production motors (would be my last choice, and I am a Mercury guy)

Note: Yamaha 350s are going away soon. I wouldnít buy them because of a number of known and documented issues.
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Old 03-17-2019, 12:45 PM
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I, along with our customer, was very surprised with the ability of triple 400R Verados to replace triple Yamaha 350s on a 42 Yellowfin repower. He gained performance all the way around (holeshot thru top end) and picked up considerable fuel economy. If youíre currently rigged with twin Yamaha 250s, I think twin 400s would be a great fit. Iíd opt for the standard production 400 Verado that was released at the Miami Boat Show. If youíre satisfied with the top end performance now then a set of new V8 Verado 300s would be a good choice too, if you can get your hands on any.
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Old 03-17-2019, 02:23 PM
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Originally Posted by davidwademarine View Post
I, along with our customer, was very surprised with the ability of triple 400R Verados to replace triple Yamaha 350s on a 42 Yellowfin repower. He gained performance all the way around (holeshot thru top end) and picked up considerable fuel economy. If youíre currently rigged with twin Yamaha 250s, I think twin 400s would be a great fit. Iíd opt for the standard production 400 Verado that was released at the Miami Boat Show. If youíre satisfied with the top end performance now then a set of new V8 Verado 300s would be a good choice too, if you can get your hands on any.
I'm waiting to hear about the fuel burn difference in the new 300 v8 versus the 350 verado. I'm not overly concerned with top speed but fuel burn and ability to push a heavy load in my 33' twin engine application is at the top of the list.
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Old 03-17-2019, 02:40 PM
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I’d look hard at suzuki 350’s. I went from F350’s to the Suzuki’s on a 33t contender and saw improvement on the hole shot, handling, top end and economy. I load very heavy and make 150+ mile runs into the gulf, that pushed me towards the Suzuki’s over Mercury’s to handle the heavy loads. I was coming out of F350’s after a couple of failures that were common with the motors, no way would I ever consider another set of those.
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Old 03-17-2019, 03:33 PM
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Originally Posted by FlyfisherJHR View Post
I have run that exact boat for 8 years with twin F350s and it performs very well. The YF34 was originally designed around that twin F350 platform. As you probably know, though, that motor has had problems, but I don't know if the more recent generations have had the same issues as the early ones. I would prob not go twin Vrod 350s b/c not enough mid-range torque (small displacement supercharged engine). Can you do trips or needs to be twins?
The 34 wasn't designed around the 350
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Old 03-17-2019, 04:35 PM
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Originally Posted by syrupdawg View Post
I'm waiting to hear about the fuel burn difference in the new 300 v8 versus the 350 verado. I'm not overly concerned with top speed but fuel burn and ability to push a heavy load in my 33' twin engine application is at the top of the list.
Typically, Scout or BW have performance reports between the new 300s and Verado 350s.
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Old 03-18-2019, 11:25 AM
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Turtle- welcome to the THT. The common theme around this place is max HP is always needed and it takes a dually to pull a bay boat. I ran a 36 Yellowfin with twin yami 350's. Boat light was a 60 mph boat and had solid fuel economy. 1.3 if I recall. I would suggest twin 400's would run a 34 great.

Before someone else says it, a triple powered 34 regardless of brand will get you on plane if you lose a motor.

This is a good read for comparison

https://www.sportfishingmag.com/boat...s/yellowfin-34

Last edited by Ris-K; 03-18-2019 at 12:08 PM. Reason: spelling
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Old 03-18-2019, 12:08 PM
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Does anyone have any performance numbers for a 34 with twin 350 Verados vs the 350 Suzuki?
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