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The only thing that makes me think that it's not the diaphragm is that as I rev engine up it slides up and stays up and it's not until I go further with acceleration and engine bogs then the slide starts to drop and if I hold the slide up engine still bogs

I've observed the slide in the carb and when I go about halfway with throttle it rises but if I go further engine bogs and slide starts to drop .... As far as the vacuum valve on gas line I disconnected fuel line after filter and when engine runs gas pours freely I've also set up a gravity fed system and still no change , never put spark plug on reader but plug is burning tannish ... Everything else you've said is gibberish to me sorry I was given this scooter for free it wouldn't start , changed battery , fuel filter , took apart carb and cleaned and regapped plug and I got it to run just bogs now over 30-35 .... I'm new to the small engine world forgive me for not knowing what some of these parts are but if u can pass me on a list of what u think I greatly appreciate it and thank you for taking the time to reply my friend