New 2018 20hp 4 stroke tohatsu power

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scoobeb
Posts: 875
Joined: 29 Aug 2011, 04:59

New 2018 20hp 4 stroke tohatsu power

Post by scoobeb » 05 Feb 2018, 14:56

Ok fellows I need some advice here if possible. I just bought a new 2018 20hp efi tohatsu and I love the engine. I had used it with the original 10 pitch prop and it's on a 1648 alumacraft. The total weight in the boat was over 1000 lbs and the motor had so much power it over revved with the 10 pitch prop which is amazing in itself. So I went to a 11 pitch prop and again at wot to my surprise it over revved,same weight in the boat.

My question is can it be possible or to need a 11.5-12 pitch prop on a 20hp 4 stroke outboard? This seems like to big of a prop but I'm hitting the Rev limiter with the 10 and 11 pitch prop. Can this outboard have that much power to need a prop that big? Seems kinda crazy. The red light on the front was going on and it started to sound like it was missing until I just let off the throttle a bit,then red light off and ran perfectly the whole way home at around 3/4 throttle or just above that. So to make sure it was me hitting the Rev limiter I did wot a few more times and again every time it did the same thing and once I let off the throttle it ran perfect. I also read in the manual this is what it will do if it over revvs,the red light and sounds like it's missing until you back off the throttle and get under the rpms. I just find this amazing with so much total weight in the boat that this engine runs with that much power that it still over revvs with a 11 pitch prop.

The only thing so far I don't like about this motor is being efi it should start easy and it takes 5 pulls every time and it shouldn't. My 20hp suzuki was efi and it started every time on one to 2 pulls. It runs unbelievable when it gets going,the most powerful 20hp 4 stroke I've ever used or owned . My suzuki topped out at 24 mph steady,I had the older carbed tohatsu and it was near 24mph,the Yamaha 20hp the same. This tohatsu at 333 CCs hits 26mph steady which is extremely impressive. So if I need to go 11.5 to a 12 I may get a mph or 2 more but my main thing is to stay under the Rev limiter.


Anyone think this is crazy to need such a big prop on this small an engine?

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richg99
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Location: Houston, TX & Crossville, TN

New 2018 20hp 4 stroke tohatsu power

Post by richg99 » 05 Feb 2018, 17:11

There are a lot of smart guys/gals on this group. However, if you don't get the answer that you are looking for here...try

https://forums.iboats.com/forum/engine- ... -outboards

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Jim
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New 2018 20hp 4 stroke tohatsu power

Post by Jim » 05 Feb 2018, 17:37

Thanks Rich!


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scoobeb
Posts: 875
Joined: 29 Aug 2011, 04:59

New 2018 20hp 4 stroke tohatsu power

Post by scoobeb » 05 Feb 2018, 21:28

I posted in both so hopefully I get an answer soon before I buy another prop,I'm leaning towards the 12 pitch prop.

nytebyte
Posts: 103
Joined: 18 Jan 2016, 11:23
Location: ND

New 2018 20hp 4 stroke tohatsu power

Post by nytebyte » 06 Feb 2018, 12:53

Was there problems with the Suzuki to make you switch to the Tahatsu? I like the idea of the easy starting.

scoobeb
Posts: 875
Joined: 29 Aug 2011, 04:59

New 2018 20hp 4 stroke tohatsu power

Post by scoobeb » 06 Feb 2018, 13:37

The suzuki had such a high pitch ear piercing whistle or scream from slow to wot and it drove me crazy,the older tohatsu/merc 20hp carb models also did the same thing. This tohatsu is a night and day outboard imo. The power alone is well worth having to pull it a couple extra times to start it. It's got no high pitch sound ,runs extremely quiet from slow to wot and the power will throw you back compared to the suzuki. The suzuki is a great running engine but I will take this tohatsu all day over it and I'm glad I did. Also near no vibration in the handle is a big difference imo. The way they designed this new tohatsu eliminates almost all vibration which is awesome,my hands don't go numb anymore,lol.

nytebyte
Posts: 103
Joined: 18 Jan 2016, 11:23
Location: ND

New 2018 20hp 4 stroke tohatsu power

Post by nytebyte » 06 Feb 2018, 15:08

I still have a couple weeks before I will be ordering so I'll keep a eye on how you do. Hope it works out for you. Any better deals out there than Cummberland for Suzuki or Tahatsu that anyone knows of?

okgene
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Joined: 16 Jan 2018, 20:44
Location: Los Angeles, CA

New 2018 20hp 4 stroke tohatsu power

Post by okgene » 06 Feb 2018, 18:26

Where are you located? Want to sell the Suzuki?

Crazyboat
Posts: 383
Joined: 17 Aug 2016, 20:52
Location: NJ

New 2018 20hp 4 stroke tohatsu power

Post by Crazyboat » 06 Feb 2018, 20:11

If you don't get your answer go to bandofboaters.com look up member Ken or propgods. They are one in the same and he can get you an answer as well as a prop if needed.

scoobeb
Posts: 875
Joined: 29 Aug 2011, 04:59

New 2018 20hp 4 stroke tohatsu power

Post by scoobeb » 08 Feb 2018, 04:04

nytebyte wrote:I still have a couple weeks before I will be ordering so I'll keep a eye on how you do. Hope it works out for you. Any better deals out there than Cummberland for Suzuki or Tahatsu that anyone knows of?
Believe me I'm a huge bargain shopper. Now maybe you can look up port a bote and they are good to. Ask for a quote or better yet call them and they usually do better then their advertised price.


https://www.google.com/url?sa=t&source= ... by-NL4Hdm4

Mike Redmond
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New 2018 20hp 4 stroke tohatsu power

Post by Mike Redmond » 08 Feb 2018, 16:32

Not shure about this,friend had same problem,hed bought a 15hp honda,he didnt know much about ob motors,his problem was that hed bought a short shaft engine,n he needed a long shaft one,twas a pricy mistake,hope this is not your case,,,wishing you good luck in solving your problem

scoobeb
Posts: 875
Joined: 29 Aug 2011, 04:59

New 2018 20hp 4 stroke tohatsu power

Post by scoobeb » 08 Feb 2018, 18:23

Mike Redmond wrote:Not shure about this,friend had same problem,hed bought a 15hp honda,he didnt know much about ob motors,his problem was that hed bought a short shaft engine,n he needed a long shaft one,twas a pricy mistake,hope this is not your case,,,wishing you good luck in solving your problem

No ,definitely not my issue. I just ordered a new 12 pitch prop so that should take care of the problem. I'm very knowledgeable about smaller outboards but again I've never in my life seen a 20hp 4 stroke outboard have this much power. I've had near every 20hp there is on the market except a Honda which are absolutely excellent outboards but for over $1000 more than any other brand is rediculous spending that type of money. There all made in japan and with the same darn parts.

Anyway, I just can't believe how this engine pushes my 1648 loaded down faster than any other 20hp 4 stroke I've ran. I'm absolutely not complaining, I'm just in complete shock and amazement and can't be happier that I bought this engine,I love it.

Unter
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Joined: 29 Mar 2015, 22:31

New 2018 20hp 4 stroke tohatsu power

Post by Unter » 20 Feb 2018, 10:08

I have the same motor on a 14-42. It is raised on a manual jackplate about 3.5" . I am 200+ over rev so i ordered a 12 pitch prop based on your history. Before raising the motor the rpm's were similar.

Should have it on in a week or so...

Unter
Posts: 3
Joined: 29 Mar 2015, 22:31

New 2018 20hp 4 stroke tohatsu power

Post by Unter » 20 Feb 2018, 10:10

Btw, at 116#, the electric start and power trim are cool.

scoobeb
Posts: 875
Joined: 29 Aug 2011, 04:59

New 2018 20hp 4 stroke tohatsu power

Post by scoobeb » 22 Feb 2018, 10:18

It amazes me how much power this motor puts out,no 20hp 4 stroke I've ever had or ran comes close.

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