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Surging issue with 18.5hp OHV I/C platinum intek

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Jeffmetzjr
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2025/07/21 18:49:18 (permalink)
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Surging issue with 18.5hp OHV I/C platinum intek

So I replaced the motor on my craftsman ZTS 7500 almost two years ago and everything was peachy. I burned up PTO clutch and never got around to fixing it. Just used other mowers. Well I just drained old gas in the old girl and got it to fire to fully choked but stalls out if I open choke. Also while running choked it surges. I can see a throttle assembly bouncing so I’m not sure if it’s in need of an adjustment to stop the surging, or if it’s not getting good fuel (requiring a carb clean/rebuild) that is causing the surge? Any insight? I put new gas in but who knows what the float/bowl looks like. Thank you.
Btw I’m new here. My late father was the mower man and I’m just trying my best to follow in his footsteps.
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    SRTsFZ6
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    Re: Surging issue with 18.5hp OHV I/C platinum intek 2025/07/21 19:00:16 (permalink)
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    The inside of the carb is varnished up from old E fuel...
     
    There are some very small orifices that must be clear. The carb and bowl
    and main jet has to be removed.  
     
    There are likely 2 different carbs available for that engine.  
     
    A full ENGINE MODEL # would help... 
     
     Also, is the float bowl (not counting the solenoid)
    held on by two smaller screws OR just the solenoid? 
     
    .

    Scott
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    Jeffmetzjr
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    Re: Surging issue with 18.5hp OHV I/C platinum intek 2025/07/25 19:00:23 (permalink)
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    Sorry I initially intended to upload a video but the file was too large. I suspected the carb is blocked up also. I’ll post back as soon as the rain stops with an engine number. Thank you for the response.
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    SRTsFZ6
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    Re: Surging issue with 18.5hp OHV I/C platinum intek 2025/07/26 07:48:26 (permalink)
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    We don't need a video..  Old fuel left in a carb causes the same thing, varnish, water, crap.
     
    Before Sonic cleaning:

     
     
     
     
     
     
     
     
    After:
     

     
     

    Scott
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