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Howieshotwings

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Posts: 2
Reply with quote  #1 
Hi everyone, hoping someone can help me here?

I am wondering if anyone on here has any experience with twin 300 G2's on a boat somewhere around 37ft mark and around the 6000kg mark?

I have a 3700 Kevlacat (Australian boat) and re-powered with twin 300Hp Yamaha's in December 2016 from twin 300 Suzukis. Not happy with the performance of the Yamaha engines and I am looking for some real world figures from the G2 owners?

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Cheers, James.

Huey

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Posts: 13,838
Reply with quote  #2 
One lump of a boat you have and Kevlacats are great hulls, hard to push thru the water but up there as some of my favourite hulls.

I have no experience repowering such a boat and not sure many would but does not really matter what hull one has, what you see in real world when going from any 4-Stroke to a G2 is better performance, lower fuel usage and cleaner running. Then nice things like the steering, clean rigging and more.

The 300HP G2 gives some 350HP's a run for their money, in particular grunt, which is what your hull needs and what I think the current engines would struggle with. If the boat is only rated to 2 x 300HP then the G2 is the strongest you will find. Is that the case, max HP is 600HP?
Howieshotwings

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Reply with quote  #3 
Hi Huey, 

Thanks for the reply. 

The hull is rated to max 700Hp so twin 350hp's is an option although I am not interested in the Yamaha's and the Suzuki 350's are new and an unknown quantity. 

Any rumour's of 350Hp G2's?

Thanks, James. 
Huey

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Reply with quote  #4 
Yes I understand about the 350HP's you mentioned and the cost of the latest 350HP is up there down here as well.

Always "rumors" in this industry, but I personally think and hope down here we see the next HP class down rather than up become "G2ed". Miami boatshow in Feb is where new products for the year tend to be released to the market.

I think you should ring around your local dealers up where you are to get a feeling from them as to if they would be upto such a repower, that goes for any brand you may fit because not the everyday run of the mill re-power and alot of areas to stuff up on such a hull. I think you would be pleasantly surprised if you swap the current out for a couple for G2's. They do look 30 inch shaft engines too so you maybe looking at a few weeks wait to get them down here-they tend to be order in engines.

50north

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Posts: 31
Reply with quote  #5 
I am currently re powering a Grady White 265 express with twin 250 G2's. I know we have different hulls and power but i have done my home work on the G2. My express is on the scales fully loaded a little over 4.6ton and gets out of the blocks in first place with a pair of old 225FITCH motors and 4 blade props. She has a big beam at just under 10feet and is a lot of boat at 265. I run the boat out of Campbell River on Vancouver island B.C and we have massive currents up to 16knts and solid trade winds averaging 15/20 so we get good wind against tide.
The only reason i am going to the 250's and not the 225's again is that the 250 is probably easier to re-sell in this part of the world and it is rated for twin 250's... don't need the extra HP for any reason.
I spoke to a guy in Vancouver and he is running the Grady White 33 express with twin 300 G2's, she weighs in a bit over 6ton and has a 10.5 beam, so again a lot of boat in the water and he says the same thing, it just accelerates out of the blocks and kills everything in the stats department. You can believe everything BRP are putting out about these engines. The cost of XD100 oil will close the gap a fair bit on the fuel you save but your still in front with everything else and no factory service for 500hrs. They are also lighter than the 4strokes and the high output engines give you another 10% in HP. oh yeah! 8 year warranty.
The one thing i have been told by those who have them set up, is that you have to get the height right and the prop selection is critical, so you might want to get the dealer to include a number of sea trials and prop changes just to get it tuned the way you want it.
I don't know much about the 350's but i do know your hull shape and once your up and away you are governed to the sea state anyway, there is lots of grunt out of the 300's. They are well worth looking at and they are now 3 years old and i am not hearing of anything catastrophic.
Hope it helps

Dean

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Dean
50northadventures.com
Huey

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Posts: 13,838
Reply with quote  #6 
I agree with the statement about making sure engine height and propping be correct with a G2, but that is the same with any outboard. The torque curve of the G2 allows easier propping in my experience than say a G1 or most 4-Strokes and with the DPS set-up, riggers just simply need to understand they should mount one but mostly two holes up vs another brand- this benefits all round performance and getting the powerhead higher out of salt water-most people rig them too low.
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