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The carburetor is hunting for the right balance because it is dirty. You will have to remove it to clean it thoroughly. That is the proper way to resolve it, but if you may want to try to add a carburetor fuel injector fuel additive to the tank and run it out. It may help to stabilize the hunting when the engine is under load. The only way to see is to try it, if you are not ready to tackle a carburetor. I have seen this trick work on my lawn mower engine. It greatly minimized the problem on my engine. Keep in mind the ultimate fix is the rebuild of the carburetor.
I think that model may use the Tecumseh engine and carburetor application. Here is a diagram of what your machine (carb/choke and governor) should look like.
The carburetor may need to be serviced. You need to find a parts shop that handles Tecumseh parts. You will most likely need a rebuild kit for the carburetor. The carburetor part number is 640303. The rebuild kit is 632809. The Tecumseh engine company shut its' doors 3 years ago. Finding parts is becoming harder and harder. I've heard that someone has bought Tecumseh over the winter but it is unknown when the new parts will hit the market. Best of luck to you.
Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming the carburetor a few times, and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor. If the mower/weedeater is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank. When you clean your carburetor and remove the jet screws, You will first seat the jet screws and count the number of turns it takes to seat the jets from their original position. That way when you go to put the jets back in, you know how many turns they were in/out. Please rate me, Thanks Good Luck, I hope this helped
Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it run a few times like that and it will flush the gunk out of the jets, but most of the time you will need to rebuild the carburetor. If the mower is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit, because the diaphragm will get hard and that will cause it to be hard to crank. When you clean your carburetor and remove the jet screws, count the number of turns it takes to seat the jets from their original position. That way when you go to put the jets back in, you know how many turns they were in/out. Please do not forget to rate me, Thanks Good Luck, I hope this helped
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