I remember my first minibike. Just a generac one with 4 horse Briggs. I kept quiet exhaust on it because I didn't want dad to be able to hear when I reached down and bypasssed the governor.
Anyhow, I ran it out of oil one day up on the hill behind our house so I coasted it down and right in the shed. I knew the engine was somewhat lose from excessive RPM so I filled it with oil and put some in the spark plug hole and waited a couple of hours. When it cooled it broke lose easily but I was afraid it would throw the rod if I ran it so I never rode it again.
I had a Cushman Truckster and a go-cart so I let the bike sit.
About that time dad came up with a Pupp Roadster from an auction and I really thought I had something then. Although it had a 4 horse Tecumseh and didn't run anything like the first bike, it had a chrome gas tank, mag wheels, and a headlight.
A few months later a kid that lived next door to my grandparents wanted a mini bike and dad asked "since you never ride that one any more do you care if I sell it?" I said I didn't care knowing that kid would destroy it in a matter of minutes even if it was like new.
I wound up working with the guy many years later and asked him if he remembered that bike and he said yeah, that thing ran great until I wrecked it so bad the frame was toast. He said his dad took the engine off and mounted it on their tiller.
As far as I know the Rupp is still sitting in the shed at dads. I haven't seen it in 20 years.