[Unkle Krusty]

Treat the shifter with care. The shifter forks inside the gear box used to bend. If the tail light blows for any reason, the headlight will blow shortly after.
They were very popular back then. Along with the same sized Kawasaki. The Hondas were four stroke and heavier with less giddyup.

UK

 

[Unkle Krusty]

Those are " Trials Universal " tires. They have better traction in dirt than many realized, and would change them for knobbies. They work fine in the dirt and grass and fallen leaves and what not. they are better on the pavement than knobbies.
Might be a 480 or smaller X 18 on the back, and a 325 or 350 X 21 on the front. 18 or more PSI in the back should keep the tire in place without rim locks. Same in the front or more, should save the rim from hitting rocks.

UK