Tohatsu troubles - Page 6 - SailNet Community
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post #51 of 57 Old 08-08-2013
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Re: Tohatsu troubles

That's not quite accurate. Tohatsu make many small outboards, but not all. They make the small Mercurys, Nissans, and of course Tohatsus, but they don't make Honda, Yamaha, and Suzuki. Not sure about Evinrude.

Letting it run dry or draining the bowl is the single most important thing you can do to keep an outboard running nicely.

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post #52 of 57 Old 08-08-2013
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Re: Tohatsu troubles

In my snowblower, generator, and various outboards, running it dry still leaves a small amount of fuel in the bowl. Draining gets virtually all of it out. I forgot to drain one season and paid the price the following spring. Spent several hours fixing it, 2 HP Honda, had to take the tank off to get the carb off.

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post #53 of 57 Old 08-08-2013
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Re: Tohatsu troubles

If you suspect the fuel is the problem here is a quick easy way to check it. It will take about 15 minutes to do so.
First disconnect the fuel line from the carb and drain some fuel into a container, I prefer to use a glass jar, about a 1/2 to a cup is all that you need to drain. Then set that aside and let it set without being agitated. After the fuel has set then look at the bottom of the jar from the top. If there is water in the fuel you will be able to see it.
If there is not water in the fuel, tip the tank so you can look in the fuel fill cap and let it set for a bit and see if there is water in it, water will always go to the lowest point so make sure you are looking in the corner and it is the lowest point, prop the tank up if you need to.
when you have ruled out the water in the fuel, the next step is to clean the jet at the bottom of the fuel bowl. First drain the bowl and then remove it, at the bottom of the lowest part of the pickup is a brass piece, use a flat tipped screwdriver to remove it and check to see if it is clear. I will generally run a small wire through it just to be sure and shoot some carb clearer through it. Even a small piece of debris or dirt will make the engine run rough or not even start.
I use a 3.5 tohatsu engine on my dinghy and have had the same problems as described and this is what I have found the problem to be.
Also I use just regular fuel from the gas station the 87 octane type that has ethanol in it. I have found that it works fine but it does take a toll on the fuel line after about a year so I replace it. I do not put any additives in the fuel, the trick is to use the fuel with in a 6 month or less period.
Hopefully this will help in solving your problem, fair winds and the best of sailing to you.
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post #54 of 57 Old 08-08-2013
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Re: Tohatsu troubles

It is almost always the fuel.
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post #55 of 57 Old 08-09-2013
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Re: Tohatsu troubles

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Originally Posted by cthoops View Post
At the risk of jinxing myself, I thought I would post this update so that it might help someone in the future.

We thought that after cleaning the carb and changing the spark plug our troubles were fixed because the outboard idled smoothly on the mooring. Unfortunately when we actually put it in gear and headed out we discovered that while the symptoms had improved somewhat, the engine still wasn't happy.

Someone on this forum had suggested it was likely either the carb or the fuel lines, so we replaced the lines running from the external fuel tank to the outboard (including the lines leading to and from the separator filter), and this included a new primer bulb. I'm thinking perhaps the PO had used the lines from the previous, smaller outboard because the new ones seemed more robust and "bigger". Regardless, they likely needed to be replaced because when Mr. Cthoops started to remove the old line from the separator filter, it immediately split in half.

Anyway, I don't know if the lines weren't large enough or there was gunk that had built up in them, but the bottom line is we've taken the boat out twice since replacing all of this and the outboard has truly never sounded better. It's quieter and runs ever-so-smooth. I am SO relieved!

Thanks again for the advice, everyone.
It was likely the old gas that was still in the fuel line.

Regards,
Brad

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post #56 of 57 Old 08-09-2013
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Re: Tohatsu troubles

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Originally Posted by sebez View Post
Just as a side note, Tohatsu is the manufacturer of all small outboards. They build them and badge them as Suzuki, Mercury, Evinrude etc. Kepp your fuel clean and run them periodically. I dont drain the bowl or let it run dry and I also use alcohol free fuel with stabilizer.
Where do you get alcohol-free gas?

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Brad

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post #57 of 57 Old 08-09-2013 Thread Starter
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Re: Tohatsu troubles

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Originally Posted by Bene505 View Post
It was likely the old gas that was still in the fuel line.

Regards,
Brad
Would there still have been old gas in it even though we had run it dry and replaced all of the gas in the external tank? Just curious for when we empty the tank into our car's fuel tank this weekend.

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