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Ok, I'm not sure what exactly it was, but I retightened the intake manifold, and hooked the vacuum line on with a stronger clamp, and it puttered to life. After revving it for a minute or so, I slapped the seat on it and drove it down the street. It powered up to 20mph and kept the needle there steady as a rock. It sounded deeper and slower than I'm used to, so I think at this point I need to fine tune the new carb.

Thanks for the help everyone, I'll be back if tuning doesn't fix the issue.

Yep, it fired right up. 

I think the new carb must be the problem, since it was starting beforehand just fine, it was a performance problem. 

I was checking the fuel line to be working, and sucking on the vaccuum got a steady stream of gas to come out of the line when it was off the carb, but putting the vaccuum line back on the manifold and trying to start it didn't pull any gas out into my waiting can. I also couldn't get it to start by sucking the vacuum hose manually while trying to start. 

I should note, the reason I even went through cleaning it was that during the winter the petcock failed and leaked through the whole system and filled up the oil.

Apologies for the long delay.

Alright, after stupidly ordering a new intake Manifold from China, I've been waiting a full month for it to come in, and hopefully I'll see it in the next week or 2. I thought I'd be patient and save a bit of money in the long run instead of patching it, but gave up on that this week. I took off the intake and patched it per directions, though looking on the inside I don't see the cracks making it through to the other side. Still not getting it to go above 10mph.

I didn't take off the throttle cable before, but maybe adjusting it might help? On the stand it gets the power it used to, vibrating with enough power to turn the scooter in circles if I don't brace it while revving.

Thanks, I was wondering if that might be a problem.