🔍 VIN / Serial Number Decoder

Enter the serial number stamped on your frame to identify your exact model year, transmission type, and electrical system. Works for CT70, CT70H, Z50A, and Z50R.

Where to find the serial number:
CT70 & CT70H — stamped into the left side of the steering head (where the forks meet the frame). Look between the forks.
Z50A & Z50R — stamped on the left side of the frame near the engine mount. May be under grease — clean with parts cleaner and a wire brush.
Enter your serial number above to identify your bike.

Serial Number Prefix Reference

PrefixModelYearsTransElectrical
CT70-CT70 K01969–19713-speed semi-auto6V points, selenium rectifier
CT70-CT70 K11972–19733-speed semi-auto6V points, neutral light added
CT70-CT70 K2–K41973–19763-speed semi-auto6V points, turn signals added
CT70-CT70 1977–19781977–19783-speed semi-auto6V points, new ignition switch connector
CT70H-CT70H HK01970–19714-speed manual clutch6V points, Hitachi, K0-era wiring
CT70H-CT70H HK11972–19734-speed manual clutch6V points, Hitachi, K1-era wiring
JH2D-CT70 Re-issue1991–19943-speed semi-auto12V CDI — completely different system
Z50A-Z50A K11969–19703-speed semi-auto6V with factory battery — only US Z50 with battery
Z50A-Z50A K21970–19713-speed semi-auto6V AC magneto, no battery, hardtail
Z50A-Z50A K3+1972–19753-speed semi-auto6V AC magneto, softail frame
Z50A-Z50A 1976–19781976–19783-speed semi-auto6V AC magneto, last US Z50A years
Z50R-Z50R (early)1979–19873-speed semi-auto6V points, no lights, dirt-only
Z50R-Z50R (late)1988–19993-speed semi-autoCDI ignition, no lights, dirt-only