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Old 19 July 2009, 23:26   #1
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possible?

I have a quicksilver 330 air deck and the transom is rated for a 15hp/50kg motor. Most 20-25hp 2-strokers are below that number. I'm thinking to try 25hp on the boat.


Is this trick possible to carry this combo for the long run or it is too much for transom carry?
Has anyone tried it successfully?

p.s. boat gets assembled/disassembled every time at the lake.
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Old 20 July 2009, 05:12   #2
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I have a quicksilver 330 air deck and the transom is rated for a 15hp/50kg motor. Most 20-25hp 2-strokers are below that number. I'm thinking to try 25hp on the boat.
Take a towel....and a change of underwear!

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Originally Posted by oujakov View Post
Is this trick possible to carry this combo for the long run or it is too much for transom carry?
Has anyone tried it successfully?
At 60 odd % overpower The problem you'll probably have is keeping the nose down & the boat in the water. The bigger HP will shove you along faster, and therefore push more air under the bow. Realistically a bakflip at first sign of a nominally small wave is a good possibility on something that small & light. Also as you'lll spend a lot longer airbourne, the transom will get a lot more of a pounding as you land, and I reckon not do the joint to the toobs a lot of good.


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p.s. boat gets assembled/disassembled every time at the lake.
a 2- stroke 25 may be as light as a 4- stroke 15, but it's still not excatly an easy lift........ Even my '72 2-pot premix Johnsorude 25 weighs in at a good 3.5 hernias!



Having said all that, if you try it it should be mental fun!
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Old 20 July 2009, 05:39   #3
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What about getting a 15hp 2 stroke, you'll still go quicker due to it been lighter and it'll be easier to setup when you launch.
Saying that I know exactly where your coming andf I'd find the buggest engine within your weight limit and go flying!


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Old 20 July 2009, 07:25   #4
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Good video!

I Did not realize that a flip is not that far away with 25hp!

I guess it is ok to have big block (400cc & 25hp ) hanging of the tail, as long as you don't open it up to wide and start flying.
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Old 20 July 2009, 09:12   #5
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Probably the best engine of all - but almost impossible to get - is the Tohatsu 18hp 2 stroke - it's the same weight as the 9 and 15hp versions.

I wouldn't worry too much about the extra power - just have someone hefty sitting in the bow.

After all the Avon Jet Rib is only 3.1m and Williams do a 2.85m one - with over 90hp - insane!!!

http://www.williamsjettenders.com/wi...ettenders.html
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Old 20 July 2009, 10:54   #6
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What about getting a 15hp 2 stroke, you'll still go quicker due to it been lighter and it'll be easier to setup when you launch.
Saying that I know exactly where your coming andf I'd find the buggest engine within your weight limit and go flying!


What was on the back there - a race tuned Tohatsu 50hp?

At least they had crash-helmets on - still scary when it happens though.
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Old 20 July 2009, 14:20   #7
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I wouldn't worry too much about the extra power - just have someone hefty sitting in the bow.

After all the Avon Jet Rib is only 3.1m and Williams do a 2.85m one - with over 90hp - insane!!!
Not really though? That would be fairly "typical" for a jetski. But is that comparable to a quicksilver sib? Solid hull, weight distribution (and weight of boat) completely different and a jet will have less efficient use of the power - and I would have thought start to lose power as it starts to become airborne and thus pump air - thus becoming "self limiting", whereas a sib's prop will still be gripping and accelerating.
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Old 20 July 2009, 16:30   #8
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It looks like weight at the transom is more important with increasing speed when you comparing 50kg Mercury 15hp 4 stroke and 50kg Mercury 25hp 2 stroke.

I'm starting to think that going 25-30mph with 25hp and jumping over the waves can rip the transom away from the SIB!
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Old 20 July 2009, 17:18   #9
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I wouldn't have thought it would.

I spoke to a lad who imported SIB's and whilst he wouldn't condone it he said his SIB's engines were more rated on weight than hp. He said if you found the heaviest 4 stroke that the SIB was rated to then find the most powerful 2 stroke of the same weight it would be fine.
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Old 21 July 2009, 08:15   #10
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50kg Mercury 15hp 4 stroke
and for another few KG you can have a premix 2- stroke 60!!!!!
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