Craftsman mower- 247.38903 running sluggish

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  #1  
Old 04-01-16, 11:12 AM
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Craftsman mower- 247.38903 running sluggish

Hi all, I have a Craftsman 21" mower with Engine model #126T02-0795-B1. the engine is running very sluggish and even cuts off. I have changed the air filter but it runs the same with the air filter on or off; I sprayed some carburetor cleaner in the carburetor and it ran somewhat better for a bit. However, if I remove the air filter and air filter housing and force the throttle lid to stay open, the engine runs very strong. I would appreciate any help. Thanks.
 
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Old 04-01-16, 03:00 PM
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By far one of the most common issues is a dirty carb.
Time to pull it off really clean and rebuild it.
 
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Old 04-01-16, 03:30 PM
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I agree.
Use a 1/2" socket to remove the bowl bolt, clean the little holes out in the bolt. Be ready to catch some fuel. You can use a pair of locking pliers to gently pinch off the fuel line if you have no fuel valve. Clean out the bowl and bolt and should be up and going.
 
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Old 04-03-16, 11:09 AM
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Ok, thanks very much. I'll do it.
 
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Old 04-04-16, 12:24 PM
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Be careful when taking apart the carb as to not damage any parts. Don't tighten screws too tight and make sure to clean every orfice. Take it completely apart. Use a lot of carb spray. I usually use almost a whole can on each carb just to be sure nothing is left. Also if you miss something it can and probably will find a way to clog it again.
 
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Old 04-04-16, 12:45 PM
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I would be checking the throttle linkage and governor. If you can force the engine to run properly, or at higher rpm, by moving the linkage manually, it does not have a fuel flow problem. If the linkage is loose, bent or mis-adjusted, you won't develop full rpm.
You can likely get an owners manual from searspartsdirect or outdoor power distributors, or the engine maker. Briggs & Stratton has all sorts of PDF files of their service manuals available at their site.
 
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Old 04-04-16, 01:42 PM
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Ok tmwalsh, makes sense; I will pull the carb and check out all the linkage connections and so forth around it.
 
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Old 04-04-16, 05:33 PM
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Above the carburetor is a metal tab with a hole in it and a spring hooked to it. It's right under the plastic cover at the front corner of the engine. When you push the mower under bushes and such, this gets bent back a bit, reducing the tension on the spring. Normally you can just bend it back forwards, towards the front of the mower until the engine speed is normal again.
 
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Old 04-05-16, 06:00 AM
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Ok, thanks. Wow good suggestion. I will definitely check it.
 
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