They are custom made by me. I use a JD Squared bender and bend 7/8" tube. I use 5HP Briggs engines. There's tons of aftermarket for them in the go-kart world. The Torq-A-Verter Clutch is key to pulling heavy loads and still having some MPH at the top end. I typically use old YZ80 rear wheels with a drum brake. I have built chopper bikes with solid forks, but lately have been using aftermarket Schwinn springer front ends. Tanks are a PITA.

As for welding. I weld like crap! I grind like a jeweler tho! Lol. I had no idea how to weld until I purchased mine. I'll post some of my other "White Trash Chopper" creations later this weekend. Headed out!