Any time that a stator must be replaced the flywheel should also be inspected. Some things to look for are indications of overheating such as blued metal or burn marks, as well as any signs that the magnets themselves have been physically damaged. Any damage to the magnets will alter the magnetic field and may prevent proper AC from being induced via the stator windings.
Basic maintenance: When the flywheel has been removed, after checking it for damage, apply some WD-40 to a soft cloth and wipe down the inside to remove any accumulation of unwanted material.
Important: The flywheel contains permanent magnets, so anything in the shop made of a ferrous metal will stick to it!
Be sure to check it for any loose bolts, nuts, screws, sockets, etc. that might be around the shop that the flywheel could pick up while off the vehicle. If installed with any object still stuck to the flywheel, it will be caught in the flywheel’s rotation and will destroy both the flywheel and the stator!
Below is an example of this in practical application. This stator was returned to us on an actual warranty claim off a CBR1000 (yes, someone actually sent this back and claimed it was a manufacturing defect.)
Overhead view: OK so far. Turn it on it’s side, different story The opposite side answers all.