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Old 06-14-2019, 04:55 PM   #1
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Class C Onan Generator

So we recently got a 1999 Four Winds Thor for a pretty good deal. I was looking at the generator because the previous owners said it worked once and never worked again.


I looked at the run time meter and it only had 124 hours on it. Additionally they told me that the original owner only used it once as well.



It's a Onan 4000 Generator
I'm not sure how long it's been since it's been used. But I bought a new battery today and some oil so I can go ahead and change that out. Is there anything else I should check or just replace because it's been so long? Fuel filter, air filter, oil filter, spark plug etc.
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Old 06-14-2019, 05:57 PM   #2
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I assume it's a 4000 onan microlite? 4k onans are noted for gummed up carburetors, even sitting more than a couple of months will do one harm due to the fuel we get today. My suggestion based on hours is just change the oil first, then remove fuel line from carb, hold down the off switch for a few seconds, that is suppose to prime ( turn on fuel pump) if you get fuel then reattach fuel line, make sure choke linkage is not bound up, it should start, if it does go to the "sea foam" website and there are links on how to clean the carb. Good luck
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Old 06-14-2019, 07:06 PM   #3
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Here's the manual for the Onan KY 4000 generator, gas and propane models. This model does not have an oil filter. There is also a diesel KY...
https://www.norwall.com/product_pdfs..._om_2_2018.pdf
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Old 06-14-2019, 10:18 PM   #4
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Had a 1997 onan
n 4k, solid other than rodents made a house in it and chewed the wires, had to drop it and pull the cover and repair, sold it with 1500 hrs still running strong.
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