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Undulating sound from engine

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zamboknee
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2024/11/06 16:05:23 (permalink)
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Undulating sound from engine

Ariens Sno-Thro Deluxe Series, (921030) snowblower, 254CC engine.
 
The engine, when fired up and running after 1-2 minutes makes an undulating sound.
 
I'll try and get an audio recording but bare with me as I try to phonetically represent the sound:
 
bwwwwWAHwwwwWAHwwwwWAH....and so on.
 
I changed the spark plug last season and just today changed the oil.
 
Any idea what that's about?
 
Otherwise, it works fine.
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    Thesmallenginehobbyist76
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    Re: Undulating sound from engine 2024/11/06 16:23:47 (permalink)
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    Does it sound like  rattle or knock or vibration?
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    Thesmallenginehobbyist76
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    Re: Undulating sound from engine 2024/11/06 16:24:26 (permalink)
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    Can you think of anything it sounds like?
     
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    zamboknee
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    Re: Undulating sound from engine 2024/11/06 17:05:01 (permalink)
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    Though it's not an Ariens, it has a 'surge' type of sound like this: https://www.youtube.com/watch?v=VZWpNnXjKAE
    The only difference is the thrower in this video sounds like its about to stall out whereas mine just surges and goes back to normal.
    I saw another video where apparently most new snow thrower/blowers have a 'hidden fuel filter' in them?
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    SRTsFZ6
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    Re: Undulating sound from engine 2024/11/06 18:48:45 (permalink)
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    Can you make and post a You Tube video with the engine acting up?
     
    Also, if you put the choke on partially, will it smooth out?
     
    .

    Scott
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