You didn't say what model of Onan generator you have. Most all I've dealt with have a plastic knob or lever and an elevation scale on the side of the carb, you move the lever to match the altitude you're running the generator. It's not inside the float bowl.
Look up your model of generator on Google followed by the word 'manual' and you should find links to owners, service, troubleshooting PDF files you can download or read on line.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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