So long story short I have an 07 First Gen Busa with a broken engine, pulled it all apart and a rod went through the engine block. Worst Day EVER... I also have a built 05 gsxr 750 that I've used for my track bike and my GF rides an 08 gsxr 600. I'm short on cash and have never done a bike engine swap... mostly have done cars such as a honda civic, mitsubishi eclipse, chevy camaro, and a pontiac trans am. So I'm capable of doing engine work on my own... Also I already have the 1300 engine pulled out and its completely not salvageable and not worth keeping. So my question being has anyone ever attempted to do a smaller engine swap into a busa??? I know its gonna suck compared to the 1300 engine and yes people will think its retarded... I'm just short on cash and need to do something with my bike so I can ride next season!!! And also what would be easier the 750 or 600? Would the busa engine bracket even fit a smaller cc engine??? I don't wanna pull out another engine if it won't end up even working. Please let me know if any of you have any info that could help me out!