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Old 03-29-2017, 01:39 PM   #1
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Default Troy Bilt 70SS trimmer rough idle/stumbling/dies

My dad gave me a Troy Bilt 70SS trimmer that he quit using because it was leaking fuel everywhere. I fixed the fuel leak, but she hasn't ran in about a year because of that leak. Now I can sometimes get it to crank but it will only run at the "most choke" position and is very rough. If I give it any throttle it dies.

I'm planning to check the spark plug out (though it shouldn't really need replacing with as little use as this trimmer has had). The fuel I'm using is about a year old, 40:1 ratio. Has been in a sealed polymer gas can. Seems volatile enough but if you guys think I should try some fresh gas I'll do that. The fact it runs at all on it makes me think the gas is probably fine but I'll defer to the experts there :P I've got some experience with small engines but not a whole lot.
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Old 03-30-2017, 01:37 AM   #2
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i would get a new plug and use new fuel. see what that does.
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Old 03-30-2017, 02:10 AM   #3
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Definitely new fuel if it was ethanol fuel. Only run non-ethanol in lawn stuff. Not good for ethanol gas to sit up for long periods.
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Old 03-30-2017, 04:40 AM   #4
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Carb is gunked up for sure. Some of the passages are clogged and need cleaning out. Just did this to my 4 wheeler this past weekend...
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Old 03-30-2017, 02:00 PM   #5
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From what I can tell on this thing, the carb is polymer and not disassembleable. I don't know much about small engine carbs, but this one looks nothing like what I would expect.
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Old 03-31-2017, 01:15 AM   #6
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a polymer carb? was it made in austria? lol
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Old 03-31-2017, 01:23 PM   #7
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ROFL!

I was mistaken, the carb is just REALLY small. It was inside a plastic housing. I had taken that whole housing off previously without realizing it came apart. Once I got into that I found that the fuel bowl was pretty gummed up. I tried blowing it out with a air compressor but I think I'm going to have to spray some carb cleaner in there.

Is it better to take the gaskets and such out of the carb and soak the whole thing in carb cleaner, or to do more of a "clean areas that need it" spot approach?
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Old 04-01-2017, 01:52 AM   #8
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since you have to take it all apart, i would go ahead and give it a soak. maybe you can find a rebuild kit somewhere.
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Old 04-01-2017, 05:20 AM   #9
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She's gummed up with old fuel for sure. I'd replace the carb, fuel lines, and filter if it has one. They're such a small pain to deal with, but if you want to rebuild that's ok too. When i worked at Napa, we also had an automotive repair shop and small engine shop. We also were a dealer for Husqvarna, Toro, Stihl, etc. 9 times out of 10 was about the same price, or not very much more money to replace a carb, than to take it apart and rebuild. Just slap it on with some new fuel lines and it was done easily. Just make sure you have the model, type, and code before getting a carb or carb kit because all companies change them randomly all the time on every small engine equipment, even mid year.

BTW shelf life on ethanol based fuels is supposedly 3 months. VP and Stihl, and I'm sure others make a synthetic premix fuel that has a shelf life of 3 years if opened, and 6 if not. It's pricey, but a lot of customers ran it in their trimmers, snowblowers, etc because it never caused problems like you are describing. Just food for thought.

I also drain fuel from my equipment, and run the fuel out before putting it up for the season. Saves a ton of hassle later.
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Old 04-03-2017, 01:38 PM   #10
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It was definitely the carb. I took both cover plates off and set the plates/gaskets to the side, then put the carb in a little glass jar and sprayed carb cleaner all through every hole i could find in it. Let the fuel bowl mesh part soak in cleaner for about 10 minutes then took it out and let it dry. Put it back in and she runs like a top! Mowed/trimmed yesterday and had no problems at all! Save me a few hundred bucks having to buy a trimmer.
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