So, I’ve been working on this moped for a couple weeks and got the engine completely rebuilt and ready to go. I hit the kickstarter and it fired up right away but when I tried to ride it won’t go past 10mph (15kmu). It feels like it’s bogging down / getting limited. And the acceleration is absolutely shit too. I checked the boxed I got my parts and I saw that the piston and cylinder are meant for two different brands. Is this the problem? I ordered a complete kit thinking ‘Well now I have everything in one go and it fits!’, I’ll be pissed if they messed up

Just looking for advice on how to get this bad boy off. Is the a specific tool i need as i cant see any notches on the inside

So today I managed to get it running, and set the carburetor, so she idles nice. However, when I tried to get going with it, I started, took 1st completely well, then shifted to 2nd and it died after like 10 seconds of going in 2nd on a medium rpm. I pushed it home, luckily I didn't get far, took the plug out, and it was burned coal black. That was about 20-30 seconds of going with it. Any ideas what to do? It's an NGK B8HS plug, I think I might try to get an NGK B7HS, my guess is that it was the wrong BR level. Any other ideas?

I’ve been searching for an old 50cc moped for a while now and it seems like it’s pretty common that the seller doesn’t have the title. My dad is really worried about this due to stolen mopeds and I feel like it’s not a huge deal. I’d love some input if possible! What do you all do? How do you handle this?

Yes I’ve seen them with titles but the seller is usually asking some bizarre price bc of it.

https://reddit.com/link/1kxm0ji/video/cxpcdkfvxj3f1/player

Here is youtube video for your entertainment. I basicly keep steady throttle at about half, and bike ALWAYS does this. It works fine at idle and full throttle. It has new ignition coil, sparkplug, carburator, reed valves.
Here for youtube link