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Surging issue with 18.5hp OHV I/C platinum intek

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Jeffmetzjr New Member Total Posts : 1 Scores: 0 Reward points: 0 Joined: 2025/07/21 18:40:20 Status: offline 2025/07/21 18:49:18 (permalink) 0 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. Quote #1 1 Reply Related Threads
SRTsFZ6 Super Member Total Posts : 2390 Scores: 80 Reward points: 0 Joined: 2018/11/18 07:20:58 Status: offline Re: Surging issue with 18.5hp OHV I/C platinum intek 2025/07/21 19:00:16 (permalink) 0 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 Quote #2

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Jeffmetzjr

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Total Posts : 1
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Joined: 2025/07/21 18:40:20
Status: offline

2025/07/21 18:49:18 (permalink)

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.

Quote #1

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SRTsFZ6

Super Member

Total Posts : 2390
Scores: 80
Reward points: 0
Joined: 2018/11/18 07:20:58
Status: offline

Re: Surging issue with 18.5hp OHV I/C platinum intek 2025/07/21 19:00:16 (permalink)

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

Quote #2

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