Ha, Those are my favorite. I have two distant cousins who are friends with roughly 66% of onlyfan 'artists' I see these suggestions constantly. My family is planning an extended family reunion and I really hope the lonely creepers show up.
A close friend of mine could help you with anything you might need. He's been into them since they were first available. The Honda dealership we met at was one of the top sellers of ATC's in the country, and was stocking most hop-up parts including tube-frames and engine parts. Shop stayed busy building them for customers, especially over the winter months.
He came into a bar I was at in Newburyport, MA many years ago, he had to turn sideways and duck through the door to get in. He was a prodigious drinker.
We had two of the ATC 90s when I was a kid. They were our main form of motorized fun. In the winter we would tie a 30ft rope to the back of the ATC and tow each other around the neighborhood sitting on a metal saucer You had to be careful not to make the guy on the saucer swing too wide going around the corners because of A: the ditches and B: one of the tires would grab the rope and start reeling said saucer passenger up to the back of the three wheeler really quick. Snag rope, stop ATC, hop off saucer, unwind rope, start going again, repeat. Good times!