Chuck Branscomb wrote:
Riding my uncle's Honda Trail 90 when I was about 11 or 12 changed my life.

I became a dirt bike fanatic, but this was actually right at the time off-road riding was about to explode in popularity (~1970). A few years later, I was able to get a Suzuki TS-185 when I was 15, and if I could have slept on that thing I would have. Unlike today, you could ride just about anywhere you could find in north Georgia in the mid-70s, and we found tons of places to ride. It was the perfect time for off-road riding as liability stuff and all was still out into the future, so riding spots were everywhere. At that point, I got into motocross and hare scrambles stuff (this is motox mid-70s style prior to all the (stupid, crazy, idiotic) jumps and massive whoops like modern mx. This drove me to become incredibly fit as competing in a 30 min race at a peak level was intensely aerobic.
Anyway, my interests shifted from electronics to mechanical things during that time period. Fortunately, I came out alive/not paralyzed from that period given how many times I crashed.

Broken collar bone was the main frame damage although a mostly compressed lowest disc in my back is likely from that experience too.
...still have my 1975 CanAm 125MX2, bike totally stock as delivered.
Cool - wish I still had at least one of my old dirt bikes. I recall CanAm's (and Maico's & Husqvarna's) were popular dirt bikes in the early-to-mid 70's, until the Japanese companies began stealing the show in '76.
At age 11 I got a paper route with one goal in mind - to buy a trail bike, and within about 6 months I had saved enough to buy myself a used 1972 Honda Trail 70 for $175. Not much power, but perfect to learn on - had a 4 speed manual tranny with real clutch, unlike some of the other semi-auto trail bikes of that time. Continued to save up and trade up to better bikes w/more powerful 2-stroke engines, eventually landing a 1980 Suzuki RM125 and doing some motocross racing. Lots of fun, I sure miss those days.