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Hot!Running Rough

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djred2000
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2016/10/11 18:56:16 (permalink)
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Running Rough

I'm new to the forum. Hoping someone can help me out with an issue i'm having.
 
I picked up a 3.5HP Craftsman edger with a Tecumseh engine from a neighbor.  It's in good condition but wasn't running properly. The engine model is 143993502 and the carb is a Tecumseh 640156. It would run for a few seconds and then die. Here is everything I have done to it so far.
 
1. Replaced the carb with a brand new one including gaskets.  I attempted to clean the old one but it was really gunked up. 
2. Replaced the spark plug.
3. Changed the oil.
4. Replaced the air filter.
5. Replaced the fuel line and cleaned out the fuel tank.
6. Verified the flywheel key is intact and there is no play in the flywheel. 
 
After lots of priming and lots of pulling, it will now run but not well. I am using fresh gas.  I took off the carb bowl and fuel does flow out if the float is hanging down. It does idle but sounds the same. Verified governor and throttle linkages are connected properly. 
 
Here is a video of how it runs.

3 Replies Related Threads

    Mikel1
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    Re: Running Rough 2016/10/14 09:46:18 (permalink)
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    Any idea what the compression is at? Fuel flow to carb good? Don't see a video.
    djred2000
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    Re: Running Rough 2016/10/15 07:53:37 (permalink)
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    I don't have a compression gauge but it feels like good compression when I pull the start cord.  Fuel flow to the carb is good. I took the float bowl off and there was plenty of fuel flowing. 
     
    Here is the video. 
    Mikel1
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    Re: Running Rough 2016/10/18 12:11:17 (permalink)
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    If you spray some carb cleaner into carb does it smooth out temporarily?
    Also how are the valve clearances?
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