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If you are getting some sputtering, I would say the carbs are not right.
I don't think Brake Cleaner is going to tell you anything, and as noted, Starting Fluid is bad for the carbs plastic parts. A small shot of gas is a better idea.
All you are looking for is a sign of life. If you get a sputter or momentary run, you know there is a fuel delivery issue of some kind.
Make sure you are charging the battery between attempts, and confirming you have full voltage. Low battery voltage is going to complicate the issue.
If it does sound like it wants to start, but not quite, back the "choke" off a bit and try opening the throttle slightly. Full choke can give you too much fuel quickly, and once it sputters it's best to back off.
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