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Hot!Tecumseh 10hp misfire at idle everything‘s been done

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Joecass
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2021/01/27 09:52:30 (permalink)
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Tecumseh 10hp misfire at idle everything‘s been done

So I brought a used Coleman generator with a Tecumseh 10hp engine. So at idle it misfires. When there is a load on the generator it stops misfiring but when there is no load on its misfiring. so I replaced the spark plug and replaced carburetor. Still no good. Removed flywheel to check the key. No problem was found there. Adjusted valve clearance .010 on both valves had to grind the exhaust valve quite a bit to get it to fall in spec. Still no good. I removed the head again and found valve Guide loose on exhaust valve so I replaced the hole block with one from eBay. It’s brand new with valves in it still missing but it’s not popping out the exhaust like before but still missing bad. So I swapped the cam with decompression mechanism on it with one out of a good running snowblower and the lifters also. Still the same thing. I also swapped out coil spark plug and carburetor still the same. I did reuse the rings in a new cylinder going to do leak down test tonight and check valve adjustment again. Any help would be greatly appreciated.

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    Roy
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/27 12:35:36 (permalink)
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    Is it misfiring at idle or full speed no load? I have never seen a Tecumseh with auto idle on a generator.
    Joecass
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/27 14:29:14 (permalink)
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    It will do it no load at idle and full throttle.
    What is auto idle?
    AVB
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/27 16:09:17 (permalink)
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    Joecass
    It will do it no load at idle and full throttle.
    What is auto idle?

    It is device that idles the engine down when the generator is not underload. Not the same as manual idling the engine down. As said most Coleman/Powermate generators don't have an auto idle feature.
     
    What is the model number of the generator?
    Joecass
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/27 18:52:49 (permalink)
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    Thank you so much for the help I’m going crazy with this thing. It has a governor on it

    Model number of generator PM0525202.03
    post edited by Joecass - 2021/01/28 05:51:43
    Joecass
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/28 14:38:48 (permalink)
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    You can’t hear it but you can see it. Is that normal seems very ruff to me
    post edited by Joecass - 2021/01/28 14:47:10
    Joecass
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/28 14:42:46 (permalink)
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    https://youtu.be/mYu6TktHTjM

    I can’t get a video in here can you copy and past the above link into your browser and then you’ll see the video. Thanks
    post edited by Joecass - 2021/01/28 14:57:10
    AVB
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/28 18:14:12 (permalink)
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    This particular generator is design to run at 3600 - 3750 rpm all day long with no idle down feature. Otherwords off load the engine should running at 3750 rpm with a 150 rpm drop under load.
    Joecass
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    Re: Tecumseh 10hp misfire at idle everything‘s been done 2021/01/28 18:20:07 (permalink)
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    Ok thanks. My problem is it’s very Rough when there are no loads on it Did you watch the video link above. You have to copy and paste it into your browser because I can’t upload a video. To me it sounds like it has a miss but I don’t know maybe that’s the way it runs
    post edited by Joecass - 2021/01/28 18:28:49
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