Had owed the gen 5 VFR and love that engine sound and torque (no down shift passing), later on all my friends sold their bike and i sold mine too, still miss that v4 engine and currently looking for a gen 4 VFR, because of the look of similar to the NR750, my question is any one ever trying to swap the gen 5 engine (fuel injected) to the gen 4 (Carburetor) bike? Are they direct bolt on or pain in butt to put on? Any input is much appreciated.