Sure the cases will interchange, then you cant use the flywheel cover, then you cant use the Ebox, then you have to find somewhere to mount the ebox. Dont even get me started on the PUMP!!! It may be "identical" to a 440 pump but I know from experience the 440 doesnt just "drop in". Either way, I owned two Laserjunks and rode them back to back to both a 750sx and sxipro and IMO they handle identical to the 750sx. Thats beside the point of them being made out of cardboard....plywood bulkhead WTF? They are made to go fast and throw away, I actually talked to an older guy by me that knew the racer I bought my first LJ from and he had nothing but bad things to say about it. My best advice would be to stay away from them, unless you like never ending "projects" you will likely not enjoy it for very long, save your money diggler, I know from experience. Wedo, when was the last time that thing saw water? How much did you ride it?