[cb-gsx-r]

Anyone know if a 2004 or 2005 750 engine will fit into a 2000 chassis. Is it even worth doing?

 

[Heavy Metal]

Should be able to, if you can fit a Busa Engine on a 600 frame I do not see why not a 650 engine from 1 year to another.

 

[Motojoe_23]

It can be done.... but it takes some engine mount mods, and the engine is not all you need. You will need the wiring harness and ECM also. Probably the throtle bodies, but not sure there.