Charlie You can buy brand new Honda "Monkey" bikes as they call them now. 125 cc 4-speed with hand clutch. Little bit more expensive than they were in 1970, like $3999 msrp.
My Brother-in-law still has his Trail 70. I got a Mini-trail Z-50 for Christmas of '67, was 13 yrs old. Was my way to/from work for the BTO 1-1/2 miles away. No lights, no speedo, so no license plate, some self-appointed Protector of the Road lady stopped me on the way home and read me the riot act about my "vehicle" was illegal, I was illegal, and she was calling the Sheriff soon as she got home. Humm, Guess I better drive my 5000# Farmall Super H to/from work, Me and the tractor ARE legal. Anyhow, Trail 70 ran 45, Mini-Trail ran 25, 30 maybe, even my Scrambler 70, CL-70 topped out at 50, but it was licensed, lights, speedo, turn signals, but couldn't pop a wheelie at all.