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First post!

I'm working on a 2005 TNG Venice right now and having some issues.

Symptoms:
The scooter will not start, turns over, but will never catch.
If I spray carb cleaner in it, and open the throttle almost all of the way, it can get it to start, then it will run somewhat rough, until it runs out of carb cleaner, then it dies.

What we have done:
Replace the old gas, flush the fuel lines.
Verified that gas makes it to the carb. If I pull the fuel line, and turn the engine over, fuel flows free. So, I've got vacuum, I think.
Pulled the plug, cap, stuck a nail in it, and watched it arc over to the plug's cap (didn't have the right socket to remove it). The spark looked very weak, but it was jumping 2 gaps, possibly a problem.
Removed carb, cleaned and inspected. It wasn't really dirty, and everything looked ok, but admittedly didn't give it great a good look over.
Adjusted the jet, all the way in, out almost all of the way, trying at various rotations... nothing.

I think this is where we are:
- Exhaust system isn't clogged, shouldn't be the issue.
- Fuel delivery to carb is good, pulls vacuum.
- At least getting some spark, enough to start carb cleaner.
- Air isn't the problem, won't run with the air box off.

I'm worried that possibly the float might have a pinhole in it, and never letting any gas in there.

What should we try next?

Thanks for your suggestions!