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Old 22-07-2020, 13:06   #121
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Re: Would You Buy Another Tohatsu??

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Yeah, but I understand that racing engines are built to loose specs to avoid the worry of break-in. Punch-it go fast rebuild it again next week.
In building Kawasaki 900ís way back in the late 70ís, early 80ís we would hone the outer cylinders to .0005 (thatís a half a thousands) and the inner two to .0015 (thats 1.5 thousands) because the inner two ran hotter.
Thatís at least as close as factory specs and we held a much tighter tolerance.
We would cut a 5 angle valve job with the valve seating at the extreme edge of the seat, and then take a die grinder and smooth the inner 4 cut angles, again much tighter tolerances.

Depending on the type of racing some clearances were opened up and or parts not installed in the theory of reducing drag to increase Hp like leaving oil control rings out. We never did because we tried and there was no more HP there, at least none we could measure, and as we were bike builders, a smoking engine wasnít good advertising.
We went faster than almost every body else and held very tight tolerances.
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Old 24-07-2020, 12:48   #122
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Re: Would You Buy Another Tohatsu??

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My starts on first pull was the sample of one, and I have looked in the Suzuki manual with no mention of two pulls, so it seems they differ in that respect, the Suzuki doesnít need a pull to charge up or whatever
Happy to report that my EFI 20hp also starts in one pull. This is the 2020 Mercury labeled one.

I must say I now tried by pulling the cord out all the way. Before, I did the lazy pull while sitting
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Old 24-07-2020, 12:53   #123
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Re: Would You Buy Another Tohatsu??

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Happy to report that my EFI 20hp also starts in one pull. This is the 2020 Mercury labeled one.

I must say I now tried by pulling the cord out all the way. Before, I did the lazy pull while sitting
What had me wondering is often times fuel and injection systems will be common among many different brands of engines, how many Diesels use Bosch injection pumps for example? I don’t think any small manufacturer makes their own.
So I wondered if Tohatsu and Suzuki shared the same fuel injection system, and if so then it’s likely they will act the same.
Of course, maybe they don’t too.
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Old 24-07-2020, 13:02   #124
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Re: Would You Buy Another Tohatsu??

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What had me wondering is often times fuel and injection systems will be common among many different brands of engines, how many Diesels use Bosch injection pumps for example? I donít think any small manufacturer makes their own.
So I wondered if Tohatsu and Suzuki shared the same fuel injection system, and if so then itís likely they will act the same.
Of course, maybe they donít too.
Comparing pictures... the clip securing the cowling, the metal supports for laying it on itís side and many other items seem so identical that I think itís the same outboard.
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Old 24-07-2020, 13:37   #125
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Re: Would You Buy Another Tohatsu??

Could be, but I’m pretty sure Suzuki makes theirs, and it’s been out at least since 2014 when I bought mine.
The Tohatsu is I believe 5 lbs lighter too.

What is the Country of manufacture for yours? It may be on the data tag on the motor, the Suzuki is I think Singapore.
I’d be real surprised if Tohatsu buys it from Suzuki.
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Old 24-07-2020, 14:58   #126
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Re: Would You Buy Another Tohatsu??

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Could be, but Iím pretty sure Suzuki makes theirs, and itís been out at least since 2014 when I bought mine.
The Tohatsu is I believe 5 lbs lighter too.

What is the Country of manufacture for yours? It may be on the data tag on the motor, the Suzuki is I think Singapore.
Iíd be real surprised if Tohatsu buys it from Suzuki.
I suspect Tohatsu may have bought a license...
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Old 04-08-2020, 06:39   #127
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Re: Would You Buy Another Tohatsu??

I have both a 2005 4hp and 2018 9.8hp EFI and both have been great. the 4ph actually got submerged when a superyacht wake flipped the dinghy when we were at anchor last year. mechanic pulled it apart and got the water out and it still run like a champ. my experience with outboard under 6hp is that no one brand seems to stand out from the rest.
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Old 04-08-2020, 06:52   #128
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Re: Would You Buy Another Tohatsu??

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I suspect Tohatsu may have bought a license...
I could see them licensing the fuel injection or computer or similar, but to build the same outboard requires a but load of tooling.
It’s possible of course, but most companies do like Mercury does, buy a Tohatsu, maybe a few minor differences spec’d like the standard lifting ring and different stickers of course.

Maybe they just copied it too, it’s not like it’s patented I wouldn't think. But they also lost 5 lbs somehow. But I just looked, slightly different displacements and RPM range too, not much different though.
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Old 04-08-2020, 08:22   #129
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Re: Would You Buy Another Tohatsu??

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What had me wondering is often times fuel and injection systems will be common among many different brands of engines, how many Diesels use Bosch injection pumps for example?

I think the Bosch injection systems are a worldwide monopoly for small diesels, aren't they? Even Zexel is owned by Bosch. Is there any other choice for a small diesel?
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Old 04-08-2020, 08:40   #130
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Re: Would You Buy Another Tohatsu??

I’m sure there are others, I don’t see the Chinese using Bosch for example, and I’d expect that common rail will bring that monopoly to an end. Ford used a HEUI injector for example, which was everything in the injector, using oil pressure to pump fuel to very high pressure. Common rail has changed things, tremendously, it’s taken a diesels from the mechanical world to the digital one.

https://www.dieselhub.com/tech/heui.html

Common rail is the future, and I’m not so sure Bosch is still a leader in it, they may end up like Kodak.

I’m surprised in a way that mechanical injected engines are still around.
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Old 04-08-2020, 09:19   #131
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Re: Would You Buy Another Tohatsu??

Kugelfischer used to make petrol and diesel pumps and injectors. I once had a very quick Peugeot 504 using them - don't see them commonly though.
Marine engineering is the most basic though - trapped in the 19th century, so likley to use Bosch.
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