Does anyone know how to decipher the serial #'s on the Tri-Motos??
Got 2 parts bikes that I'm trying to figure out what they are.

I just got a 1985 Yamaha 200ER Tri-Moto. (The one that came with racks, shaft drive, elec. start, & reverse.)
It needs some work- starting with the carb & tires.

I got 2 regular 200 TriMotos (i think) for parts, if anything will interchange.
I'm trying to figure out what these two are for sure. They are chain driven, have front shocks, no rear suspension. Look to be the same size as my 200ER, minus the racks.
Can't find the model #'s, just serial #'s.