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post #11 of 19 Old 06-21-2013
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Re: Tohatsu help

meboater,

The Tohatsu sounds like an easy fix, per methods described by others above.
The Yamaha is a bit trickier. Beyond the cleanliness of the carb, there are a few tests you can do. The black cylinder sitting atop the carb has two wires. Test this "thermoelectric choke" for resistance with a multimeter; if it reads outside the range of 4.8 - 7.2 ohms it is faulty and will prevent starting altogether (mine read zero but once replaced the 9.9 Yammy fired up perfectly). Another similar test is resistance with the CDI, but you'll need to research the specs. Electromechanical issues like these can be tough to diagnose (I am still learning) but you can do it, sometimes better than the pros.
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post #12 of 19 Old 06-21-2013
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Re: Tohatsu help

The ethanol dries out and makes a very sticky glue. It will also stick up a float needle and result in a no run at all condition. Do dry out the carb by pulling off fuel line or shutting fuel off to kill when parking. I have had it stick up a float needle over night. Wet (old) fuel makes it worse as etnanol has a certain affinity for water. Fiberglass fuel tanks are also a no-no with ethanol. I have seen it happen with three different motors. (Willy's Jeep, Stihl chainsaw, and Merc 7.5 outboard)

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post #13 of 19 Old 06-21-2013 Thread Starter
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Re: Tohatsu help

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Originally Posted by MarkSF View Post
When you have finished running the engine, do you always run the carb dry of fuel? If not, you are constantly gumming up the jets, and it's a cumulative effect.

Another good habit is Stabil or similar in the fuel.

A third good habit is NEVER to use fuel that is more than one month old. Dispose of it in your car's gas tank.

Following these 3 habits, or not, can make all the difference, between a nightmare engine and a dependable one.
I use stabilizer, and was actually wondering whether running the carb dry is a good idea. Is it? What about moisture?

I would like to do something different, as I really appreciate a working motor when I need it.
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post #14 of 19 Old 06-21-2013
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Re: Tohatsu help

Yes I think it's a very good idea, probably the most important of the 3. Some people say that running it dry is not sufficient, you should drain the bowl too. I don't go that far.

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post #15 of 19 Old 06-21-2013
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Re: Tohatsu help

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I use stabilizer, and was actually wondering whether running the carb dry is a good idea. Is it? What about moisture?

I would like to do something different, as I really appreciate a working motor when I need it.
Suggest you drain instead of "running dry" as a small amount of fuel is left in the bowl when "running dry".

Paul T

Last edited by dabnis; 06-22-2013 at 10:08 AM.
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post #16 of 19 Old 06-22-2013
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Re: Tohatsu help

There are some gas stations that sell ethanol free gas. My suggestion is to purchase ethanol free gas and your gum problems will be solved for the future!

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post #17 of 19 Old 06-23-2013 Thread Starter
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Re: Tohatsu help

Thanks for all the input.
Removed the carb, took it part way apart. Gently put a thin wire through 4 different little openings, and sprayed the hell out of it with carb cleaner.
It works great.
I did this hanging over the transom, which is nervewracking. Especially as I kept screwing up and actually had to re-install it 3 times.
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post #18 of 19 Old 06-23-2013
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Re: Tohatsu help

OK great!

It probably wont happen, but if it plugs up again, take it off and soak it for an hour in that carb cleaner kit. That gets out every little bit of dirt.

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post #19 of 19 Old 06-24-2013
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Re: Tohatsu help

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Originally Posted by meboater View Post
Thanks for all the input.
Removed the carb, took it part way apart. Gently put a thin wire through 4 different little openings, and sprayed the hell out of it with carb cleaner.
It works great.
I did this hanging over the transom, which is nervewracking. Especially as I kept screwing up and actually had to re-install it 3 times.
Glad you got it fixed. "Over the transom"? Oh my, If I had done that half the parts would be on the bottom.

Paul T
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