Do you mean going to a Stock OEM Yamaha CDI from an MSD Total Loss System?
If it's just the MSD Enhancer CDI, than it's an easy swap at the Electrical Box.
If it's removing the MSD Total Loss Control Brain, then the Yamaha CDI would need to be installed along with the matching OEM Ignition Coil, Stator and Flywheel.
Because the MSD Total Loss System uses TWO Ignition Coils, then it has Two Pulse Pick-Ups. The Stock OEM System uses only ONE Ignition Coil and ONE Pick-Up and fires BOTH Cylinders every 180 degrees of rotation, thus one Spark is wasted every firing and is called a Wasted Spark System.
By the way, what is happening to Andrew Tate in Romania?
Cheers