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I have an older FS80 which has probably been ravaged by ethanol. I have been looking for a new carb or rebuild kit. My problem (one of many):confused2: is I don't know what carb I have. The powerhead says made in Japan and there is a number 13446533 on the side. The carb has a detached primer bulb and a plunger (?) on the top to facilitate priming. Any and all help will be greatly appreciated. I would like to see the old girl run again! :laughing:

Carburetor for FS 75, 80, 85 is a WT-447

Thank you!

No, you have one of the old fs80 trimmers, made in Japan, they have a TK slide carb, which have been nla for 20 years or more. They still make an aftermarket kit for it, as well as the primer bulbs.

TK Carb Kit Full Fits Old Stihl FS80 and Shindaiwa T25 | eBay

Here are a few pics of the old fs80



Well one anyway, the others disappeared.....

Kitgage, how did you make out with the FS80. Rebuild kits are out there. TK carb with the round fuel pump. If you got it running and the overflow constantly pours fuel out, here is a fix. I have an old FS80 as well. Just drill a hole in top of fuel tank and run a line from overflow back into tank. Make hole a little smaller so fuel line fits tight.If you don't have air filter and housing and don't want to pay the high price for an NOS stihl part, you can use a Shindaiwa assembly from a c-25 or c-35 trimmer. I forget the exact number of turns on the air bleed screws to make it run right, but if you need help I can try to find my notes.

Hope you got it running, it's a great old trimmer, a little heavy but a screamer.


Chris


Also, you probably need a primer bulb. Kawasaki trimmer bulb , #49043-2065 works fine. Some unscrupulous people are selling them for way too much. Shop around, you will get a decent price.

I have the same weerdeater. It will not get fuel. I have narroved it down to where the metering needle goes into the carb. It is make the needle valve that lets fuel in stay seated. I may need to bend the bracket up a little to let the valve unseat. Any ideas?

Is the primer bulb pulling fuel from tank to carb? Have you cleaned carb? Is the diaphragm in the fuel pump still pliable? When was the last time it was running.?

Also is it the made in Japan from the late '70s, early '80s? Just so we're on the same page I had to ask.


Chris

I have done every bit of that. I fixed it last night. The needle that gets pressed when you press the tickler button has a check valve behind it. I drilled it out and soldered the hole shut. it was sucking air. runs good now

Good deal. Glad you got it running. It's a nice old trimmer. I love getting the old/ discarded ones running again.

Chris

I do to. I am anxious to see if it still runs tonight.

EKOSMUS said:

I have done every bit of that. I fixed it last night. The needle that gets pressed when you press the tickler button has a check valve behind it. I drilled it out and soldered the hole shut. it was sucking air. runs good now

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I have a green machine 2500 with the TK carb. It is doing the same thing... have to press the tickler and hold it to get it to run. Could you be more specific as to what you drilled out and soldered shut. I think mine is sucking air instead of gas somewhere.

If you can just plug the hose that drains the excess fuel and not let air go back into the carb, you will be OK. The Stihl/Shindaiwa/Green Machines, all had different variations, but air sucking back into the carb from the drain was common with
most of them....

It ran great the next day. Fish is right i did not have to do so much. Just plug the overflow hole. I actually have 2 of these machines both were my grandfathers. The other carb does the same thing as this carb but dies when I cover the overflow tube. Does not get any fuel unles I pump it. I have not got around to working on it yet. I think it is the fuel pump on this one. I will have to get another rebuild kit from fish and start over. But right now I am catching up on weedeating.

Yeah, I dug around the shop, but could only come up with an old Shindaiwa tk carb. Which is a little different on the drain setup.

Fish said:

If you can just plug the hose that drains the excess fuel and not let air go back into the carb, you will be OK. The Stihl/Shindaiwa/Green Machines, all had different variations, but air sucking back into the carb from the drain was common with
most of them....

Click to expand...

Thanks for the tip. Makes sense to me. I'll give it a try and let you know if it fixed it. I'm wondering if that was the thing that the other guy soldered shut to solve his problem?

if yoU take the diaphram off of your weedeater , where the tickler button is. Right in the middle is a needle. I drilled the needle out and soldered it there. At the time i did not know that was a a check valve for the overflow. If i would have known I would have just plugged the hole that fish is talking about. Somehow I always do things the hard way.

EKOSMUS said:

if yoU take the diaphram off of your weedeater , where the tickler button is. Right in the middle is a needle. I drilled the needle out and soldered it there. At the time i did not know that was a a check valve for the overflow. If i would have known I would have just plugged the hole that fish is talking about. Somehow I always do things the hard way.

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Thanks for taking the time to reply.... at least you got er done:smile:

mtnpapa said:

Thanks for the tip. Makes sense to me. I'll give it a try and let you know if it fixed it. I'm wondering if that was the thing that the other guy soldered shut to solve his problem?

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I tried plugging it up and it still didn't work. I'm just going to buy another weedeater.... Thanks for your help!

I have an FS80 that I purchased new in about 1997. It's been in the shop twice. Both times due to not draining the fuel out during winter storage. The last time I picked it up from the Stihl dealer, the mechanic brought it out to me himself. He had replaced the entire carb. The total bill was $70. I found one of his comments interesting. First, he gave me advice about storing it, second he said that the FS80 was absolutely one of the best weedeaters ever made, and that if I simply drained the fuel from the tank, and then ran it until the carb was empty, this thing would last forever. He also commented that the newer Stihls weren't the same quality.
Most of this was nothing but his opinion, but he made a lot of sense.

By the way, this trimmer must have many hundreds of hours on it, and still runs like a top. I used it for an hour today.

K

I have drained the fuel, rebuilt the carb, replaced the fuel filter, changed the plug and it still won't run unless I hold the tickler in to give it gas.

If memory serves me correctly, the green machine had a red button on the carb to shut the fuel off to shut it down. Have you had this out and cleaned in there?

Fish said:

If memory serves me correctly, the green machine had a red button on the carb to shut the fuel off to shut it down. Have you had this out and cleaned in there?

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Your memory is correct.... it's a red thing that you pull out to let the fuel flow and push in to shut it down. Yes, I've had that out as well as just about everything else in the carb. As I posted before, it will run if I push the "tickler" (on the bottom of the carb) in.... so it's getting fuel until I release the tickler.... then it dies. The problem is you can't regulate the fuel correctly with the tickler so you get too much or too little.

When you are pushing your "tickler", is there fuel dribbling out of the overflow?

Damn, that almost sounds "dirty"......

Fish said:

When you are pushing your "tickler", is there fuel dribbling out of the overflow?

Damn, that almost sounds "dirty"......

Click to expand...

Yes there is fuel coming out of the overflow.