Honda NU50 & NU50M (Deluxe)
Make this your new best friend http://projectmopedmanual.info/Manuals/Honda/Honda-NU50-shop-manual.pdf
Information you find for these bikes is interchangeable EXCEPT the electrical systems. The NU50M is wired to include a starter that the NU50 doesn't have . The batteries are different for each bike. This link will take you to the more detailed description of the bikes, years, and colors https://en.wikipedia.org/wiki/Honda_Express
Like with other bikes, tune it to stock before going all crazy with kits, etc. Save yourself the headaches tons of people before you have had.