We call this one "FrankenQuad"... Someone had attempted to build a YFZ450 with a GSXR 600 K3 engine, and pretty much scrapped it. We took it on and spent a lot of time undoing what the previous owner had done, and then started from scratch again.
SE3 with an 05 R1 Engine
Marks Quad with new Owner and new Engine... It's now a Big Bang
Jason Gurr's Raptor 700 Turbo, we removed the turbo engine and replaced it with a 2010 R1 Big Bang engine. Our favourite conversion so far.
Seems like this is everybody's favorite build, it must be the colour scheme.