Brushcutter

Heyseed · Jun 30, 2019

Got a Stihl brushcutter, it's about 15 years old and is giving me fits. It starts and runs for a few minutes but then will die if I don't feather the throttle. Then it won't even stay running when I do that. Acts like it is flooding out. I was going to buy a carb kit and do a rebuild, but a brand new carb is only a few bucks more. This is a FS250z and the question is how do I tell which carb it has. They list three. Haskill, Anzac, and Allong.
Thanks for any help or ideas.
heyseed

2x4 · Jul 1, 2019

prolly all will work. They change carbs sometimes simply becuz they get a cheaper one but the set up is still the same. If the throttle throat is wore out it will show brass instead of silver color. If that is the case, no carb will work.

M-MAN · Jul 1, 2019

Name will be on the carburetor. I have always had to take them off to find it though.

Steve@Advance · Jul 1, 2019

Be sure to check the fuel line inside the tank. It can break or crack where it comes through the tank, won't pick up fuel properly.

Have you tried to adjust the high speed mixture?

And there may be a spark screen in the muffler that needs cleaning occasionally.

Heyseed · Jul 1, 2019

Thanks Steve, I haven't taken it apart yet, but will check those things.

T.R.K. · Jul 1, 2019

Most Stihl trimmers ran Zama carburetors for many years. But some don't say ZAMA anywhere, just Stihl. You can still tell if its a ZAMA, remove it and there will be some letters cast in the housing like C1Q or C1U that are hidden by one of the mount studs. The other carburetor number will be stamped on the body somewhere and it will be an alphabet letter, two or 3 numbers and sometimes another letter. (S23A) for example. There is usually another row of numbers stamped below the model number. I've never had to use them but they sometimes cause confusion if they can be read easier than the model number.

So you use the whole number, like C1Q-S23A when looking up a carburetor. The first three are the series, the rest of the model designates which particular carburetor it is in that series.

Even those selling Chinese carburetors should be able to tell you which carburetor they sell replaces the one you have using your model number.

Heyseed · Jul 1, 2019

Thanks t.r.k. I haven't taken it apart yet, this thing called my job keeps me distracted.
I will get to it over the holiday.

Oregon Tractor Jack · Jul 1, 2019

I have to ask this. Is your fuel okay? Have you tried it some other piece of equipment? I was having trouble with my Stihl string trimmer similar to what you describe. I poured out the old stuff and poured in some new mix and all the problems went away.

OTJ

Russ from MN · Jul 2, 2019

We have a similar one that my dad bought about 30 years ago, had to put a new sparkplug in it this spring. The gas cap is cracked, I suspect it got some E-10 in it at sometime, otherwise it runs fine.

Brushcutter

Heyseed

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2x4

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M-MAN

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Steve@Advance

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Heyseed

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T.R.K.

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Heyseed

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Oregon Tractor Jack

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Russ from MN

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