I've managed to come into a pretty cool project. As a part of my University, we build Formula SAE cars each year to compete. This year our car borrowed the power train from a 2013 WR450F, leaving the chassis behind sans motor. I purchased the chassis to help fund the team and I am planning on rebuilding it. I was hoping to turn it mostly into a YZ style bike, but upon further investigation, that doesn't really make sense. My biggest issue is finding a motor. The team also offered to sell me the motor from the 2012 car, which used a 2011 WR450F motor. Meaning it was carbureted. I really want to return this bike to full 2013 specs, so I'm wondering if I can use the main case, cylinder and head from the 2011 with just the EFI equipment bolted on. I know 2012 is where the big changes occurred to the engine management, but I'm unsure as to whether or not the actual engine itself received any redesign. Any input would be appreciated and I'll be happy to share some pictures of the progress later this week!