MOPED ARMY

Your pictures only show so much. I do see some blow-by which suggests the rings aren't doing as well as they should. What does your compression measure?

The compression is about 123 and is supposed to be 150

I’d clean the surface of the piston with some light grade steel wool or Dremel with carbon steel brush. Was your stator and coils all wet from oil? Not good that means your seal is bad which can cause low compression as well.

Bad seals give air leaks on these bikes too. I hope you have manual by this time. Note that seals on Left and Right sides are different sizes. You have to pull the kickstarter gear behind the variator to get at it, then pull with a 3 jaw puller. Make sure you put some kind of protection between the spike on it and the end of your crank, or you could split it (not kidding, I've seen a picture of it on here somewhere). People have different way of getting on the right side seals. most people just use some kind of pick to pull it. I'm using a paint can opener. Can get one free at the hardware store. Some of the techniques are on YouTube.

And yes, go ahead and change the rings. They're relatively cheap. If you can solve the problem with new rings it will save you swapping those seals (at least for now). As you can see, it's kind of a pain.

Agree with the stator. I just want to see if he can get it running first. It doesn't sound like he's done a lot mechanically (unless I'm reading things really wrong), so fixing one thing might at least get him going.

I have one I'm changing rings on because it has low compression too. It's an easier fix after troubleshooting a lot of other stuff. If it still doesn't work I'll figure out where to go from there. You're right, it will probably end up being seals.

Temporarily , hose the stator down with a good amount of brake cleaner . Make sure you hit every connection good and any moving parts . If it has points , be sure to clean them well and check gap .

That may help get the motor running long enough to assess .

Good Luck .

I have been looking at the manual online and saw this. What does foreign matter stuck in starter or starter gear mean? Also the battery that is on it is junk.

is the carb still leaking gas?

Insure the exhaust is clean/clear and not partially clogged .

You might like this site : https://www.cruzinimage.net/?s=nc50

What is ring gap, heat cycle and how do you hone a cylinder also would I want the standard size piston instead of the oversized.

Do you really think that piston and rings will correct these symptoms?

You may just need to adjust your carb. How many turns out is your idle/air screw? Should be around 1 1/2.

In the last picture, is that bushing thing supposed to be snapped like that?

Could that be causing my problem