Couple questions from the sub, if I may? I understand mechanical matter in an abstract, mental way, but I'm not much of a mechanic , overall. So, please keep that in mind with your answers.

1. My bike (a 4 or 5 year old 49cc Icebear, approx 2k mi., not exactly sure what specific model, maybe a Rocket) is experiencing power-loss. I'll give it full throttle, and it just sort of...thinks about it for a moment before getting underway with any oomph It has an enhanced carb (bigger spray-nozzles, but I don't know the details) and I just put a new fuel filter on it. It was going really well for a while, and it seems to get its power back after he sits for a bit, but once he gets warmed up and going, the power just trails off. Any ideas where to start from here, keeping in mind what i said above? He does need an oil change, and I intend on doing that very soon.
2. Also keeping in mine my starting caveat, how can I boost him a little? I'm not looking for 60mph speeds, but I'd like to be able to keep up with traffic in a 40mph uphill zone. I've heard things like getting a better battery, removing the speed restrictor (?) and a few other things. Also, how can I upgrade him a bit to make him easier to control and ride at the slightly higher speeds?

Feel free to DM me with the advice and suggestions. Thank you all ahead of time for any help you can offer. I do have a mechanic who has worked on my bike before, but I'd rather not pay $75/hour shop labor if it's something I can easily do on my own.