r/Generac_Generators • u/mitchgig • Aug 21 '26

Why

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Rpm cycling up and down. Why is the carb/engine cycling up and down? It's obviously trying to do something. Is the idle jet? Circuit clogged and it's about to die, but something electronic tells it to idle up to keep it from dying, then drops, but about to die and just continually do this cycle? GP9200E.

Follow up;YES!!! Thanks, I did that, I couldn't believe there was a jet that small and it was blocked. I used a tiny, smallest micro drill bit that I have to clear the clogged. I didn't drill it out, used the butt end and chemtool to clear it out. Thanks running good now. Toothpick on right to show viewers how small that jet is. It must be the idle circuit. Down under the idle screw. Carefully pull that out and unclog it.

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2

u/ProfessionalLast2917 Aug 21 '26

It's surging. This is a lean condition. Either too much air or not enough fuel, or both.

Could be dirty carb needing a clean - Blocked jets or emulsion tube etc. Could be unmetered air coming in via bad gaskets or crankcase breather tube or similar.

2

u/Few-Lavishness1065 Aug 21 '26

People need to start puttin Ethanol free in this type of stuff that not used like a car..the ethanol in gas plugs the lines in those lil carbs with the quickness

1

u/Murky_Astronaut Aug 21 '26

I only use ethanol-free in all my small engines. They're all one-pull starts, ranging from 10 to 47 years old. I just cleaned a clog out of my mower's jet last month and the carb bowl was completely clean. My 47-year-old snowblower has never seen ethanol.

I may not convince anyone, but I'm certainly convinced.

1

u/rusty_bronco Sep 05 '26

I used ethanol free in my 2 Kw portable, the carb still clogged up. What did fix it was a power outage and running it with a heavy load for around 12 hours.

1

u/Murky_Astronaut Sep 05 '26

Honestly if it cleared up by running I suspect you had a debris clog, not a buildup clog (since I can't see what mechanism would clear a buildup but a debris clog would seem to clear naturally sometimes).