Carb Problems

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  #1  
Old 05-29-14, 05:20 PM
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Carb Problems

Hey guys.

I took my carb off my mower as I believed one of the gaskets was leaking and getting air in it. I put some silicone gasket maker on the heat-shield side of the carb (acts like a gasket as well) and now the mower is running rich. It stumbles and really doesn't change if I pull the choke on it either. I checked the spark plug (which was new last week) and it's coated black I don't see any adjustment screws. Any input guys?

Newbie here!!!

Model Number for mower: 12a-46mc500

http://www.mtdproducts.ca/equipment/...&serialNumber=
 
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  #2  
Old 05-29-14, 09:11 PM
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What carb is on it? Does it have the white plastic insert with the float attached inside?

Is your choke stuck on?
 
  #3  
Old 05-29-14, 11:38 PM
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I'm not sure what kind of carb it is. If you click the link I provided then click on the top link it opens up a service manual that has a breakdown of the parts on the mower. It's one of those Home Hardware mowers, Yard Machines.

When I put the bowl back on the float was there. I guess I'll have to take a look and check and see if the choke is working right.
 
  #4  
Old 05-30-14, 12:21 AM
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Nevermind about the plastic insert in the carb... I thought this was a different engine. Check the choke and go from there. Also try it without the air filter and see if it runs better if you don't find fault with the choke.
 
  #5  
Old 06-05-14, 10:24 AM
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I took off the airbox and it started and struggled again. I can see the choke open and close when I pull the choke on the handle so it's not stuck.

Could it have anything to do with my putting gasket-maker on the heat-shield side of the carb? Otherwise what else do you all suggest?
 
  #6  
Old 06-05-14, 11:39 AM
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When you say the heat-shield side of the carb are you talking about the gasket that connects the carb to the intake manifold of the mower? In any event, silicone and carburetors rarely go together. Not sure of silicones ability to resist gas but the main concern is the flaking off and it getting into small holes in the jets, etc. Can you remove the silicone and obtain the proper gasket?

Also, in the picture of the carb in your link (#14) just under the 5 sided rectangle (might be the heat shield you were talking about) there is a small screw with a spring on it. That looks like an fuel mixture adjustment needle. Do you see one like this on your carb. Perhaps the little piece with the cross on it is over it to keep you from adjusting it, but if it is, maybe it comes off.
 
  #7  
Old 06-05-14, 12:51 PM
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I'll take a look at that, thanks. I didn't notice it when I had it apart. I also was told maybe I put the bowl back on wrong and it isn't allowing the float to sit correctly.
 
  #8  
Old 07-13-14, 03:21 PM
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Still haven't gotten this fixed!!

I cleaned it out completely today and it runs fine while it's sitting still as soon as I start moving it (bouncing it around) it starts sputtering/dying. I'm thinking float problem but what kind of problem?

Can someone help
 
  #9  
Old 07-15-14, 02:47 PM
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Bump!!

help please!!!
 
  #10  
Old 07-16-14, 09:10 AM
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Still need help with this! I need to mow the lawn LOL hayfield is growing!
 
  #11  
Old 07-16-14, 09:26 AM
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Does it leak gas when parked? Sounds like maybe the fuel level in the carb is too high.
 
  #12  
Old 07-16-14, 10:03 AM
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Will check now, thanks for the response!
 
  #13  
Old 07-16-14, 10:11 AM
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Just check, it's been leaking overnight. What should I do?
 
  #14  
Old 07-16-14, 08:46 PM
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Something is keeping the needle from stopping the flow of gas. Check the needle and seat, and make sure the float can move easily.
 
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