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Old 24 October 2015, 07:09   #1
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25 or 30 HP?

Hi all

Searching around to buy a 25 or 30 HP 2 stroke for my sib this winter. Would I be right in saying that most 25s and 30s have the same block and are therefore similar in weight? If that's the case I may as well get a 30. My aerotec 420 is rated for up to 30hp.

Cheers

Simon
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Old 24 October 2015, 07:19   #2
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Hi all

Searching around to buy a 25 or 30 HP 2 stroke for my sib this winter. Would I be right in saying that most 25s and 30s have the same block and are therefore similar in weight? If that's the case I may as well get a 30. My aerotec 420 is rated for up to 30hp.

Cheers

Simon
Not sure about with four strokes, but my 20hp two stroke is the same block as the 25hp (and the 30hp has an extra cylinder so is not the same!)
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Old 24 October 2015, 07:25   #3
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25hp Mariner here for under a grand. http://www.willsmarine.co.uk/store-p...rd-engine-995

As Poly has mention, different weights based on increase from 2-3 cylinder, certainly for Yammies. 2 Stroke Mid Power marine-outboard Products | Yamaha Motor Australia
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Old 24 October 2015, 07:35   #4
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Hi

Mariner does a 30hp twin which is the same weight as a 20hp,I think the difference is possibly carb and exhaust change.
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Old 24 October 2015, 07:50   #5
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Hi

Here's one on Ebay item no.111798343261.carb clean or electric probs.
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Old 24 October 2015, 12:06   #6
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Hi

Here's one on Ebay item no.111798343261.carb clean or electric probs.
That does look nice! Need a long shaft ideally but if the right engine came up I would alter the transom
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Old 24 October 2015, 13:57   #7
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Yam 25 @ 54kg two stroke
Yam 30 @ 59 kg through to 66kg according to an Australian site
As a comparison Suzuki 25 @ 62kg 30 @ 71kg four stroke 2015 models
I went for the maximum engine size on mine less work on the engine OMO
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Old 24 October 2015, 14:17   #8
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As mentioned above, largely depends on the number of cylinders.

For instance, Yamaha did make a 2 cyl block that was 20/25/30 hp, and were all a similar weight. They also make a 3 cyl thats 30/40/50 hp and those are a lot heavier.
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Old 25 October 2015, 06:28   #9
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As mentioned above, largely depends on the number of cylinders.

For instance, Yamaha did make a 2 cyl block that was 20/25/30 hp, and were all a similar weight. They also make a 3 cyl thats 30/40/50 hp and those are a lot heavier.
The 2 stroke 40hp and 50hp 3cyl are the same block, the 30hp 3cyl is different. The 2 cylinder tohatsu 25 and 30 are the same, just a restriction behind the carb I think
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Old 25 October 2015, 06:53   #10
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The 2 stroke 40hp and 50hp 3cyl are the same block, the 30hp 3cyl is different.
The OP's question was about weight,I know they are not exactly the same.

Was making the point that you can get Yam 30's that are similar in weight to a 20, but you can also get Yam 30's that are similar in weight to a 50.

Trust me, you dont want to try picking up a 3 Cyl 30 and sticking it on the back of your SIB.
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