Nice thing about Banshee is aftermarket support. You can build an engine completely from aftermarket parts!
Converting street-bike into racer always carry over some compromises. Such as overbuilt frame for +350lb bike. When starting from ground-up clean-sheet design, you can have super light frame designed with 200-lb bike in mind. With 100bhp & 200lbs, I can build chromoly trellis frame that weighs ~15-20lbs depending upon whether I want it to last 5 or 10 years.
That's significant 50-lbs weight savings over street-bike frame. I can also build it with exact geometry I want. Probably 23-degree rake and 50-inch wheelbase, splitting difference between RC390 and NSF250R.
Here's interesting article about fine-tuning RS250R's frame to beat better-handling TZ250:
https://www.superbikeplanet.com/knif...s250-makeover/
If you can call "
The existing steering head was cut off. A new one was designed from scratch, and welded in place" fine-tuning. They didn't say exactly which specs were modified to increase trail. This is typically done by reducing offset at triple-clamps. But this pulls front wheel backwards, reduces wheelbase and changes weight-distribution. So they probably relaxed rake-angle by fraction of degree to place front-wheel back in original location.
I want to get my hands on that Computrack software that Honda was using!