I'd rather see one of these with a pocketbike front tire and a KT-100 powerplant...and no pvc anywhere. If you don't have enough hp to break the rears free, then get another engine.
Man Flash, them old 250R's were a blast back in the younger days, finding one in mint condition these days is rare, and they cost a fortune to be an old Honda 3wheeler lol. Could ride wheelies for miles on them, put a good pipe/muffler, air filter and rejet the carb and its a beast to ride. I'd love to find another one in decent shape with the original engine for a winter project!