Parts for PA50II
The best source for parts that I have found for Honda parts, bar none, is CMS Holland.
These people can get just about anything you want. Get to their website by searching for CMS Holland.
Once you're there, follow the prompts to Honda followed by Motorcycles. The PA50 mopeds are not listed under scooters, but motorcycles. Once you're at Motorcycles, you have to click on the page numbers until you get to the PA50II. The Honda model letters and numbers are alphabetical, so PA is several pages in.
Once you click on PA50 II for your year, you'll get a complete parts list with original Honda part numbers.
The PA50's were popular for a while in Europe. They were assembled in Belgium. Of course the biggest problem with them was getting to the carburetor. You have to separate the rear of the bike from the front. It's a job, but, like cleaning and re-assembling any machine, once you've done two or three times, you get the hang of it.
If you've done the spark plug, air filter, muffler and serviced the CVT, and still have no performance near 30 mph, I'd definitely move on to the carb. Even after you split the bike, it's still a pain to extract the carb from where it lives. Take your time, and watch out for that spring coil that's wrapped around the rubber boot on the carb intake. It can take flight if you aren't careful.
Removing the reed plate is about the easiest way to get the carb out of the engine frame. Be prepared to do some serious twisting of screws. The reed plate screws are ususally in very tight. Don't hurry to remove the Phillips head screws here. They are in tight, and can easily get their heads stripped. If you are successful in removing all four of them, I recommend you go to a well-equipped hardware store that carries a full line of metric nuts and bolts. Get 6mm stainless Allen head bolts and replace the Phlllips head screws with them. You'll be glad you did if you ever have to get in there again. By removing the reed plate body, still attached to the carb, you do not have the problem of trying to reach down into the carb area to remove the two 10mm nuts holding the carb to the reed plate intake manifold.
After the carb is out, and cleaned, be sure to note the orientation of the float bowl. It is actually possible to put it on the carb body 180 degrees out. If you get it wrong, the engine will still run, but not well, because the float will stick, and other stuff. Who knows, maybe your float bowl is on "backwards" right now, and that may be why your ped is running, but poorly. Later.
J. T. in Missouri