MTD Snowthrower Choke Issue - Snowblower Forum : Snow Blower Forums
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post #1 of 40 Old 02-03-2013, 01:59 AM Thread Starter
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MTD Snowthrower Choke Issue

My two year old 2 stage MTD will only run smooth if I keep the choke half way when it's cold. Once it has been running for a while to warm up I try to turn off the choke but it idles up and down. It needs a little more choke after warming up the colder it gets outside.

So it seems as if the engine never heats up and it won't allow me to turn off the choke. It's as if the engine is constantly cold. At least the choke is acting that way.

If I start it in the summer it runs with the choke almost off but not quite all the way off.

It has been like this since I bought it and never really thought anything about it. Just wondering if this is normal? I have read a few articles saying that the engine could be running lean and that I might have a vaccum leak or lean mixture. It runs fine and has good power otherwise. Thanks for any tips.

Last edited by Ralph_T; 02-03-2013 at 02:08 AM.
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post #2 of 40 Old 02-03-2013, 02:51 AM
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definitely Running lean. I would clean the carburetor on it since the main jet is most likely gunk-ed up a bit and not allowing enough fuel flow. Most newer carburetors have fixed jets and you can not adjust them. Make sure that the carburetor gasket between the carburetor and the manifold is not leaking too since that can lean out the fuel air mixture.
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post #3 of 40 Old 02-03-2013, 09:31 AM
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hello ralph, welcome to SBF. once you clean the carb get a can of seafoam. take the gas is the can you use to refill the snowblower and pour it in your car or truck. get some fresh gas in your gas can for the snowblower and mix in the right amount of seafoam by following the directions on the can. seafoam works as a carb cleaner and fuel stabilizer

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post #4 of 40 Old 02-03-2013, 06:06 PM
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the glory of emissions carb, they stink. you would be able to make an adjustment but you cant. it needs a carb rebuild and it will get better.
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post #5 of 40 Old 02-03-2013, 06:24 PM
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It it has removable jets you can just remove the main Jet and run some thread or super-floss through it with carburetor cleaner sprayed on it to clean out the obstruction thats causing it to run lean. On my Predator 212cc I enlarged the Jet slightly with super floss and polishing compound and cleaned with carburetor cleaner since it surged a bit when the temperature was below 30 degrees. It runs great now with no choke on even as cold as 0 Fahrenheit
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post #6 of 40 Old 02-03-2013, 07:36 PM
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if the machine is only 2 years old it probably has an emissions carb. hope fully it does not and it will take all of 20 seconds to solve his prob.

the nut on the bottom of the carb.....is there a screw sticking out of the center of it?
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post #7 of 40 Old 02-05-2013, 11:15 PM Thread Starter
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Took the carb apart as far as I could go. Its a Huayi. When I got the 10mm bolt undone on the bottom of the bowl I got access to the float which when removed I could see the check valve needle and then I got in there and used a flat blade to undo the jet assembly. Nothing looks out of the ordinary and all orifices are clear. Prime squirter works good. So Im really at a loss what could be the issue. The gaskets seal great and are like new.
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post #8 of 40 Old 02-05-2013, 11:31 PM Thread Starter
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I forgot to add that the engine still needs part choke even at slow idle. So this tells me that the idle jet is clogged. Does anyone know the location of this jet? Because as I said before the mainjet works fine because if I increase the throttle manually it will run fine with choke completely off. Make sense?
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post #9 of 40 Old 02-06-2013, 02:06 AM Thread Starter
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Found the idle jet. Hard to believe I didnt see that with the carb off. I shoved a small piece of wire in it from my wire brush and a small plastic piece fell out. I think this might be it. Will test tomorrow.
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post #10 of 40 Old 02-06-2013, 02:14 AM Thread Starter
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Quote:
Originally Posted by td5771 View Post
if the machine is only 2 years old it probably has an emissions carb. hope fully it does not and it will take all of 20 seconds to solve his prob.

the nut on the bottom of the carb.....is there a screw sticking out of the center of it?
Its a 2009 MTD YardMachines 2 stage with a Techuseh? The carb does have a screw bolt for draining at the bottom of the bowl. The carb says Huayi 34.
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