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Old 02 July 2019, 15:42   #1
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30hp mariner and honwave t38

Does anyone have any expirance with a 30hp 2 stroke on honwave t38? struggling to find a good 25 2 stroke - but just found a nice mariner 30 2 stroke and the weight is the same...

Looking forward to your replies!
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Old 02 July 2019, 16:02   #2
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How many passengers do you intend to go boating with ?

Happy Boating
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Old 02 July 2019, 16:13   #3
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2/3 of us... just wondered if it's dangerous for any reason
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Old 02 July 2019, 16:39   #4
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I would say the 30 is too powerful for a T38, once you hit around 23/24 knots they are getting past the hull speed and start getting very flighty, I put a borrowed 20hp Suzuki on mine and the boat felt at its limit flat out,
Constantly having to tiller the boat to keep it straight,
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Old 02 July 2019, 16:46   #5
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thanks, anyone got any suggestion on the best rib for a 30hp 2 stroke? the smaller it packs the better, although appreciate that's a bit contradictory for this size!
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Old 02 July 2019, 17:27   #6
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A 30 HP motor is good for a 420-430 size Sib. Check if you can find a 2 strokes S 18 HP motor, excellent for that 380 size Sib for 2, 3 up.

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Old 03 July 2019, 04:53   #7
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Acwyam when you say you've found a good 30hp 2-stroke do you mean you've bought it?

If so that makes things hard to advise because it's not an ideal motor for daily setup sibbing. Far better to go with a modern 44kg or so 20hp 4-stroke efi or a lighter 36kg 15hp 2-stroke and there is an option for sale at the moment... a 41kg Tohatsu 15, a very well regarded motor the same as Loco's above that then can be very simply upgraded to 18hp...

https://www.ebay.co.uk/itm/15-Hp-Toh...sAAOSwGYhb113L
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Old 03 July 2019, 04:58   #8
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no I haven't brought one yet. I'm upgrading from a 15hp. need somthing to tow a ringo or wakeboard...
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Old 03 July 2019, 06:17   #9
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Would that Tohatsu uprated to 18hp do it I wonder?

Have to admit if you really need the power assuming you are looking at the 429cc Mariner 30hp they are pretty light for that power at 51kg. There are some 4-stroke 20hp models that weigh more than that.
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Old 03 July 2019, 14:16   #10
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You can't possibly upgrade a Tohatsu 15 HP to a 18 HP, are different CC powerheads. Need to ask yourself if towing a ringo will be done frequently, sporadically, once in a while to go for a 30 HP.

The issue with a 18 is that will need 2 boaters, driver and bow boater to distribute deck weight evenly while pulling a ringo, if with just the driver, the Sib will have a bow up attitude and probably will not plane out as there's too much water drag out transom.

With a 30 HP will be capable of towing a ringo along boating with 2-3 up. Once the beast has been fully tamed, throttle to a speed you are comfy with, no need to run the combo at full throttle all the time.

Is that Mariner 30 same as this Tohatsu motor ? If so, can play with the throttle settings and detune it to a 25 if needed.

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Old 03 July 2019, 16:20   #11
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>>> can't possibly upgrade a Tohatsu 15 HP to a 18 HP, are different CC powerheads.

Sorry... yes you are (Edit: mostly) correct... confusing as what I had in mind was Mercury in areas where 2-strokes were still allowed did a Super 15 which was a Tohatsu 18 detuned by just some sort of restrictor. Same bore, stroke and capacity as Tohatsu 18. Simple to put it back to an 18 apparently.

Edit: To add to the confusion seems Tohatsu do/did a version of the 15 called a MX15E2 which was a restricted but otherwise the same capacity version of the 18 like the Mercury mentioned above and upgradable...

https://www.tohatsu.com/int/outboards/MX15E2.html
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Old 04 July 2019, 02:01   #12
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No one has mentioned that a 30hp is above the rating of a T38 and might give issues re insurance if that concerns you
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Old 04 July 2019, 13:51   #13
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Mercury has a 2 strokes Super 15 which is a rebadged Tohatsu motor, not to mention it's actually a 18 HP with a fancy name. The MX versions are the heavy duty Everrun models.

Find strange that the MX 15 and the MX 18 shares sane CC powerhead according to their web page ?

The only difference between a similar M and a MX model is the latter comes with more SS bolts, a SS water pump and different looking cowl.

If with no legal or insurance issues go for it if plan towing ringos, doing recreational boating or a mix of both scenarios as well.

Happy Boating
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Old 13 July 2019, 11:54   #14
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I've got a Mariner 25hp 2 stroke on my T38. I can assure you that the last thing you need is another 5hp.

On your own, you can go flat out with the 25hp but even on a calm and flat river you won't want any more power.

When 3 or 4 up in the T38, there's so much floor ripple going on at WOT, you won't want any more power then either.
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