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Old 18 October 2016, 21:47   #1
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Twins to single

I'm thinking of repowering my Zodiac Hurricane 733 from twin 150 hp to a Single Yamaha or Suzuki 300hp. Would I need to get a 300 with a 30" shaft for a single verses a 25" shaft on my twin 150s? It has an 18" transom extension. I have heard conflicting advice on this.
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Old 18 October 2016, 22:22   #2
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Yes for a single you need a 30" shaft. I assume it's the zodiac bracket? A 250 is plenty unless you really want a 300

Jason
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Old 19 October 2016, 09:29   #3
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And remember, a 4.2L Yamaha 250 is the same as a 300 running 87 octane fuel (in the 300, you need to run 89 or greater octane to get 300 HP). I'd just get the 250!
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Old 19 October 2016, 10:36   #4
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And remember, a 4.2L Yamaha 250 is the same as a 300 running 87 octane fuel (in the 300, you need to run 89 or greater octane to get 300 HP). I'd just get the 250!
So your recommending a 250hp, but if you then use the same above analogy the 250hp in using 87 octane with be putting out 200/210 hp, RIB might not even pop-up on the plane! lol
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Old 19 October 2016, 12:17   #5
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So your recommending a 250hp, but if you then use the same above analogy the 250hp in using 87 octane with be putting out 200/210 hp, RIB might not even pop-up on the plane! lol
The 4.2L 250 hp only specs 87 octace. So, no.
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Old 19 October 2016, 17:07   #6
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Twins to single

Thanks for all the help.
So I need to look for a 30" shaft.
It is a zodiac extension on the back.
The reason i was leaning towards a 300 is because I feel I need as much HP as possible. Based on the dry weight of the boat being approx 4000 pounds from what I am hearing plus fuel, seating and 12 passengers being another 4000 I think I will need all the help I can get to get this moving at a good speed with out having to push the engine so hard.
However if the 250 technically will do the same thing ill have to look into it.
I'm looking for a good used motor so its allot easier to find a 250 than a 300 i'm finding out.
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Old 19 October 2016, 17:42   #7
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I know of a local 2014ish Yamaha 300 for 11k, I might get it for my SR7.4 but let me know if you were interested.

What are you going to do with the existing twins?
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Old 19 October 2016, 17:52   #8
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Thanks for all the help.
However if the 250 technically will do the same thing ill have to look into it.
I'm looking for a good used motor so its allot easier to find a 250 than a 300 i'm finding out.
I don't know if my comments help you if you're buying used since you may not find a used 4.2L 250 hp around.

The 3.3L 250hp is a V6 and is not the same at the 4.2L 300 (or 4.2L 250). The 3.3L 250 hp requires 89 octane.

So, let me back up - If I were buying new, and I had to decide between a 4.2L 300 hp and a 4.2L 250 hp, I'd probably choose the 250 hp based on price alone. I'd be ok with a few mph slower off the top end. Torque is what is get you up on a plane, not hp. Both 4.2L blocks will have plenty of torque!
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Old 19 October 2016, 18:02   #9
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Beat me to it. What are your twins?

My boat topped out at 50mph when it was new no t-top and such. Now it's in the mid 40s.

I could easily pull a wake boarder behind it in Lake Tahoe with 10 passengers on board. Beautiful cruise to emerald bay with 12 on board. Still can't hardly tell the difference between 2 and 12 at altitude.

I cruise 25-30 in the 3400rpm range. 4000 Rpms gets me into the mid 30s I think.

It's not working too hard. Still get 3mpg too. Up over 35mph the mileage starts to drop. I'm not saying don't get a 300 but I'm not sure you'd need it.

For commercial stuff, tours and such, I would think twins would be better. A little redundancy and with the single I get some serious torque lean.

Jason
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Old 19 October 2016, 18:50   #10
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I would definitely be interested in the 2014 Yamaha 300 if you decide not to pick it up. Is it a 30" shaft?
Please keep me posted on that.
I will be selling my twins.
If there is any interest in them they are:
2012 Evinrude Etech 150HP, shows approx 4,500 hrs on computer, have receipts showing new power head, injectors and lower end replace at approx 1,500 hrs. New Stainless prop with spares. No issues, looks and runs great.
2015 Evinrude Etech 135HP HO has approx 1,500 hrs on it. Issue with this one is 60 psi in cylinder 1 and 120 even in all other cylinders. Using it daily but if pushed will over heat.
I'm assuming needs rings in that cylinder but don't really know.
That also has a new stainless prop and spare.
Since i'm going single all controls, gauges, harness etc are available.
I also have lots of spares including cowlings, lower ends, starters, full blown engines etc for parts.
Let me know if there's any interest.
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