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Old 02 April 2019, 04:27   #1
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Mercury F 20 M EFI - Proís & Conís

After a long search, Iíve given up on finding a Tohatsu 18hp 2T standard shaft on tiller locally and/or in good condition. So, Iím thinking of pairing a new Merc 20hp EFI with my Aerotec 3.8. This will be replacing my current Tohatsu 9.8 2T - which is great for when on my own, but not when crewed up.

Does anyone have any first-hand experience of this engine, on an Aerotec or other similar sized sib? Iíd be grateful for any feedback, good or bad, before making a decision.

Iíll be lifting it from an engine store to the boat (approximately 15 feet) and using the Zodiac big beach wheels or a club trolley, to launch from a slip a few metres away.

Iíve lifted the engine (dry 45 kg) at my local dealers and seems doable for me. Does anyone launch in a similar way and not need to visit a chiropractor on a regular basis?

Am I likely to suffer from the ďtransom splashĒ that I do with the Tohatsu, under certain conditions?

Thanks in advance.

Dan
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Old 02 April 2019, 09:29   #2
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Donít know yet Dan sorry.

After a brief hiatus, returning to sibbing and have a Mariner 20 efi/T38 on order.

Previously ran a Suzuki 20 efi on an Aerotec. Hardly any transom splash with the Suzi raised on a 25mm spacer and 22 knots one up.

Expecting the new Merc/Mariner 20 to have similar performance, grunt and economy. Might be subject to a little more transom splash on the Aerotec though, as the Suzi lower leg profile with large av and splash plates seemed particularly good at minimising this annoying quirk.

The Suzuki was definitely the best 20 weíve had, and on paper canít see any reason the new Merc/Mariner/Tohatsu will be any different.
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Old 02 April 2019, 09:55   #3
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Mercury F 20 M EFI - Proís & Conís

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Donít know yet Dan sorry.

After a brief hiatus, returning to sibbing and have a Mariner 20 efi/T38 on order.

Previously ran a Suzuki 20 efi on an Aerotec. Hardly any transom splash with the Suzi raised on a 25mm spacer and 22 knots one up.

Expecting the new Merc/Mariner 20 to have similar performance, grunt and economy. Might be subject to a little more transom splash on the Aerotec though, as the Suzi lower leg profile with large av and splash plates seemed particularly good at minimising this annoying quirk.

The Suzuki was definitely the best 20 weíve had, and on paper canít see any reason the new Merc/Mariner/Tohatsu will be any different.


Many thanks chipko.

All good to know!

Iím tempted by the Suzuki and thereís not much between them. But, the new Mercuryís vibration reducing mount, tiller position and gear lever design is looking really positive for me.

I guess Iíll only find out about the splash, when I get it out on the water. Itís no biggie if I need to make a riser for it - just hoping there wonít be the need.

As an aside, how many (average size/weight) crew can I realistically hope to plane along with, using a 20hp?

Cheers,

Dan
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Old 02 April 2019, 10:09   #4
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I had the same outfit as Chipko until we downsized our Suzuki 20 to a Mariner 9.9 for reasons of portability.

On top of all the kit and fuel we carry plus a 45lb dog the most weight in people was a total of 43 stones and the 20hp planed that load fine.
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Old 02 April 2019, 10:10   #5
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Mercury F 20 M EFI - Proís & Conís

At least three. We could easily tow a light adult on the wakeboard with two up.

Yeah, gone for the Merc/Mariner on looks and tiller etc. Suzuki was great, and would have no qualms with another, but seems wrong not to try the newer design opposition.

Re splash. Iíve never seen any engine combo on an Aerotec not benefit from raising with a packer. In fact not had any sib yet where Iíve not...for improved performance not just splash.
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Old 02 April 2019, 15:32   #6
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Yeah, gone for the Merc/Mariner on looks and tiller etc. Suzuki was great, and would have no qualms with another, but seems wrong not to try the newer design opposition.
Agree with you but why buy Merc or Mariner made by Tohatsu when the real Tohatsu has an extra two years warranty?
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Old 02 April 2019, 16:11   #7
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I had the same outfit as Chipko until we downsized our Suzuki 20 to a Mariner 9.9 for reasons of portability.

On top of all the kit and fuel we carry plus a 45lb dog the most weight in people was a total of 43 stones and the 20hp planed that load fine.


Thanks Fenlander,

That sounds very much like the maximum load that I would be running with, on occasion. Good to hear that a 20hp will cope well with that. More often than not, itíll just be me, or me +1, which should prove to be good fun!

I must say that I have read and followed many of your posts, especially those relating to the Aerotec and have found them invaluable.
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Old 02 April 2019, 16:22   #8
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At least three. We could easily tow a light adult on the wakeboard with two up.

Yeah, gone for the Merc/Mariner on looks and tiller etc. Suzuki was great, and would have no qualms with another, but seems wrong not to try the newer design opposition.

Re splash. Iíve never seen any engine combo on an Aerotec not benefit from raising with a packer. In fact not had any sib yet where Iíve not...for improved performance not just splash.


Great. Three would be the max for me. I use my main rib for boarding and skiing, but would be good to use with my daughter on the ringo.

Looking forward to hearing your reports on the Merc/Mariner when you get it. Itíll be early June before Iím in a position to place an order. Largely due to a lack of time to use it before then.

Yeah, the splash quirk seems to be something you just have to workaround, if you want the pleasure of owning and using an Aerotec.
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Old 03 April 2019, 12:23   #9
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Agree with you but why buy Merc or Mariner made by Tohatsu when the real Tohatsu has an extra two years warranty?


Prefer the edgy look of the Merc/Mariners, like the fancy tiller, and best deal to be had on Mariner so cheapest of the three.

Agree 2 years extra on Tohatsu warranty initially appealing. In reality how much benefit will this be? For warranty to be intact it means 2 extra dealer annual services, and I probably wonít even keep it for 5 let alone 7 years.

Of course if it all turns to cheese after 5 years and 1 day Iíll think, Ďwish Iíd listened to that guy on Ribnetí
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Old 04 April 2019, 15:53   #10
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Danexe, i'm waiting on a delivery of a Tohatsu mfs20e to go on an Aerotec so will keep you posted on the splash issue once ran in, shouldn't be too long.
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Old 05 April 2019, 02:35   #11
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Danexe, i'm waiting on a delivery of a Tohatsu mfs20e to go on an Aerotec so will keep you posted on the splash issue once ran in, shouldn't be too long.


Hi Stevem and thank you.

Ooh, I bet youíre exited! Iím looking forward to hearing your experiences when you get out with it.

Out of interest, are you purchasing yours from a local dealer, or from an online seller?

The discounted prices Iíve seen online are tempting me to go that way. Iíll still be supporting my local dealer with servicing, but online prices would save me enough to cover the 20 hour service and the first 100 hour/annual one.

Cheers,

Dan
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Old 05 April 2019, 08:17   #12
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Hi Dan

I bought mine from the local Tohatsu dealer on the North East coast. I phoned for a price and it was as good as i could find online. I've another Tohatsu that I get serviced there and they have been great so it was a no brainer for me. Do like the look of the Merc and the tiller looks great but I will more than likely be using mine with remote steering so the tiller not a priority for me.
Dealer just phone and picking it up on Monday so may try and get out one night next week depending on the weather.
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Old 11 April 2019, 01:21   #13
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Hi Dan

First time on the water with the new Tohatsu. I was only running half throttle so too early to give a definitive answer on the transom splash but I certainly didn’t get anything coming over at half throttle. Don’t get me wrong there was splashing but nothing like experienced with the two previous outboards I’ve had. There was also a bit of a wind blowing down the river so a little bit bumpy which didn’t help.

I’ll update again once fully ran in, Steve.

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Old 11 April 2019, 03:12   #14
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Hi Dan

First time on the water with the new Tohatsu. I was only running half throttle so too early to give a definitive answer on the transom splash but I certainly didnít get anything coming over at half throttle. Donít get me wrong there was splashing but nothing like experienced with the two previous outboards Iíve had. There was also a bit of a wind blowing down the river so a little bit bumpy which didnít help.

Iíll update again once fully ran in, Steve.



Thanks, Steve!

Perfect. Looks like good (non-splashy) fun to me! Great to see your video and in conditions Iím used to.

Having not had an engine from new before myself, I guess your keen to get the 20 hour running-in over?

Iíve just finished fettling my rib and itís now back on the mooring - giving me time to focus on the Aerotec and the re-power.

Iím going to my main dealers again this week - watch this space. Your video has definitely inspired me to open my wallet!

Cheers again.

Dan
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Old 11 April 2019, 11:58   #15
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Hi Dan

It’s a ten hour run in period, but yeah want to get it ran in asap so I can start using it fully.

Good luck with your purchase!

Regards, Steve
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Old 19 April 2019, 00:50   #16
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Hi Dan,

Ran the engine in a bit more yesterday and had it at full throttle for a few moments which was enough to confirm there was no splashing coming over the transom and that was without any riser shim!

Regards

Steve
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Old 19 April 2019, 05:33   #17
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Hi Dan,

Ran the engine in a bit more yesterday and had it at full throttle for a few moments which was enough to confirm there was no splashing coming over the transom and that was without any riser shim!

Regards

Steve


Thanks for the update, Steve.

That sounds really positive and quite a relief that the splashing hasnít occurred. I know itís not a big job to create a riser, but would much prefer not having to put one in place.

Referring back to your previous post - when I asked my local mercury main dealer about running-in and ongoing service schedules and costs, they said 20 hours for first service on the Merc 20 and then annual/100 hour thereafter. Iíll double check with them for my purposes.

Cracking weather this weekend. I hope youíre out enjoying it!

Cheers again.

Dan
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Old 19 April 2019, 10:26   #18
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You are right Dan, I've just checked the warranty card and it states 20 hours or 3 months for 1st service.
The manual says the engine can be used fully (full throttle) after the 10 hour run in period.
In reality I'll probably hit the 3 month period before the 20 hours but will be over 10.
I think its going to be great for my needs on the BAT. Steve
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Old 03 June 2019, 05:38   #19
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I hope your experiences with your new engine are proving fun and dry, Steve!

Having ďalmostĒ given up finding an 18hp 2T, as already mentioned - I have just purchased this little minter...

Iím taking it for a first on-water spin with the Aerotec today. I imagine Iíll be needing to fashion a suitable riser/shim in the not-too-distant.

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Old 03 June 2019, 05:54   #20
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Dan well done on finding that. Unusual to find a Nissan badged one in the UK. I bet it was less than this one that I noticed the other day (top left of page)...

https://www.ivanburdfieldmarine.com/outboards-1

Be interesting to hear how you get on with the weight... 3kg less than the newer light 4-strokes but 5kg more than the Mercury/Mariner 15 2-stroke.

Report back as soon as you can on how you find it overall.
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