Question about Mtd 22" Yard Machine Push Mower

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I have a 5 horse two stage yard machine snow blower. It is about 4 to 5 years old. It will start and idle as long as the choke is on. once the choke is turned down it dies immediately, even after being warmed up for a few minutes. When I engage the auger it also looses power and will die. I can put the wheels in motion just fine. Any ideas?

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It sounds like either the carburetor is gummed up or has water in it. Let's be sure gasoline flows well to the carburetor before doing anything else. Pull the fuel line off at the carb. and run some into a glass jar. It should pour out, not just a trickle. Look for water in the fuel, if there is any then let it settle before pouring the fuel back in, just don't put the water in. If fuel doesn't flow from the line well determine why- clogged filter, foreign matter in fuel tank, etc. Look and see if there is a screen in the fitting on the carburetor- these can plug and give you just the issues you're seeing.

If you have the B&S motor with the carb mounted right to the fuel tank just go to the next step.

Fill the tank most of the way with clean fuel and spray about a half can of Gumout aerosol carb. cleaner in the tank. The screw-top can of Gumout isn't the same, use the aerosol. Fire it up and let it run for half an hour, see if it's better.

If it doesn't straighten out with the Gumout then it's probably water- taking the air cleaner off will allow you to put your hand over the carburetor throat- open the throttle wide and pop your hand over the carb. so that you flood it mightily for a moment, then take your hand off and let it recover and run smooth. Repeat a couple of times and see how it runs now. This will pull the water from most carbs, if it doesn't seem to then you can try a little alcohol in the fuel. Alcohol will remove the water but it takes a long time, it's easier a lot of times to just open up the carb. and let the water out.


Posted on Dec 29, 2010

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I hate to say this but it sounds as if your carb needs cleaning as the fuel flow is being restricted at the un-choked position. Before you have to take the carb apart, try this. Go to Walmart, or Northern Tools and buy a can of "SEAFOAM" which is a fuel additive that cleans carb jets and passages, and may over time unclog your jets. Other cleaners on the market work so if you can't find SEAFOAM, then use another. Siphon all of the old fuel out of your tank into a plastic jug, put fresh fuel into your tank.Pour twice the amount recommended in to your tank, and start the machine with the choke on and let it get the fuel mixture running into the carb. Run it as long as possible and when it dies out, let it sit for a full day and night. Try it again and repeat the running process.

The fuel that you use is 10% ethanol and alcohol is very hydroscopic and sucks in water and combines it with the gasoline. This water latches on to dirt and grime, and junk and eventually clogs the jets. If you let the gasoline with the ethanol sit in your tank unused for more than three months, it becomes jelly like. That is why it is a prudent measure to run all of the gasoline out of your machine before it sits for anytime longer than 3 months. Some wag said that the government mandate to add 10% ethanol to gasoline was just a full employment contract for engine repairmen. If you plan on leaving gasoline in small engines for a period of time you need to add some "Stabil" to it to prevent jelling of the gasoline.

Posted on Dec 29, 2010


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