Do you have any 6 volt ignition coils?
No. A 6 volt coil is for a 6 volt battery ignition. The only vehicles that I know of, that have 6 volt ignition coils are vintage ones from before the 1970’s and 80’s. 1980’s and later cars and big motorcycles all have 12 volt ignition coils. Big motorcycles, like cars have “battery ignitions” where the ignition power source is a battery. Small motorcycles and mopeds have “magneto ignitions” where the ignition power source is a generator. The ignition coils for small motorcycles and mopeds do not say any voltage.
Do you have a rebuild kit for my engine?
2. Disassemble and diagnose what is bad
the least might be just piston rings, which I have
Do you have the original ignition coil for my moped?
Is there an external ignition ground that goes outside to power the brake light, that must be grounded to get spark?
Is there continuity through the points, when they are closed? Or are they “dirty”?
Do the points even open enough, or is the points cam rusty, and the points wiper worn so there is no gap?
Has the flywheel been put in the wrong position, so that the spark is at the wrong time, and/or weak?
Has anything been changed, like a different flywheel?
These are the likely things, in order of most likely first.