Well back in the 1960's, old motorcycles were cheap. I learned to ride on my sister's C50 scooter when I was 7 or 8, and by the time I was 9, I'd bought my first bike, a Yamaha Omaha 80cc two stroke off road scooter for the princely sum of $5, from a neighbour who later murdered a pastor, and is in a mental institution for life. I took the engine out and installed it in a Gemini minibike frame.
I bought lots of old bikes and minibikes back then, I had a Honda 150 twin that I paid $10 for, a 305 Dream in mint condition, for $25 That I rode flat out for several laps of an old disused horse racing track until the engine seized @70 MPH and I went for a big slide on wet grass.
I had GT50 and DT1 Yamaha's, BSA Bantams, Royal Enfields, a BMW R69S, then I joined the Army in 1977 and I bought a Yamaha TX500 (I had the choice of the Yam or a Ducati 450 "Silver Shotgun", and of course, I chose the Yam..........) in 1978 I traded the Yam in on a new old stock 1975 CB750F, which I thrashed within an inch of it's life. To be honest, I didn't like it. It was Yellow, ugly, the exhaust would scrape on right hand turns, the rear brake would lock up while the front brake would barely pull you up, so I traded it in on a car when I'd had it less than a year.
In 1980 I bumped into a mate who'd owned a CB750K1 since he was 15 years old. He'd thrashed it too, and it was no longer a runner, so he sold it to me with a crashed K0 for spares, for $300. It took awhile to "restore" it, but after a couple of false starts which included a full top end rebuild, I rode it without too many issues for another 4 or 5 years, eventually replacing it with a 1975 Goldwing, then a 1975 KZ900.
I've since bought and sold probably 20 CB750's (I've currently got 5 or 6, mostly in pieces (I've bought a 1969 K0, 1970 K1 and 1972 K2 this year alone, they always seem to come to me mostly in pieces) another 6 or 7 BMW's, a couple of Suzuki GT750's, a T250, CB350F, Yamaha XT500, Kawasaki Z750L1, Ducati 900SS, my 2007 Triumph Rocket III that's been in the family since new, 2 Harley Sportsters, Honda VTR1000 (x 2) VFR750, Yamaha FJ1200 and Honda GL1200 (donated both to charity) CX500 (x2) and Honda XR500R.
I never really intended to be a "Honda Guy", I only bought my first CB750 because I couldn't finance a Z1 when I was 18, but as disappointed as I was with my first "F", the second CB750, the K1, was a much nicer bike, and I've loved early K series CB750's ever since. Cheers, Terry.