I wasn't sure what the source of the morini motor was. For sure welding on frames it not only allowed but expected. But near as I could tell by looking at bikes, everything there had some kind of bike frame history. I believe even a moped frame would be ok, because it comes with pedals But a ninja 250 with pedals added that don't function would likely be kicked out. Get the pedals to operate on a ninja 250, and hey they might allow it. But I think the basic thing to look at is the recently passed Arizona motorized bicycle law. If it fits that surely you can run it in the Death Race, with maybe some tweaks for more speed of course. The whizzer, a modern made equivilant of the earliest motorcycles has pedals, so it was in. I don't know for sure, but somebody was saying it was a 125 cc. Everything else on the track was 65-90cc depending on the head mods.