I installed a Honda R/R at about 40,000 miles, and the original stator on my GS850G made it to 102,000 miles. The Honda R/R is still fine.
I think all stators will eventually succumb to age -- after many years and thousands of heat cycles, the insulation and epoxy surrounding the windings will eventually get brittle and fail.
Stators are made with copper wire that is covered with a tough, clear plastic insulation (magnet wire). This is wound onto a laminated steel core, and then the windings are coated with epoxy to lock the windings into place.
As the rotor magnets spin around the stator, there's a significant amount of magnetic force trying to move the copper windings. If there's no epoxy, or if the windings are at all loose, this will cause tiny movements within the windings which will eventually rub through the insulation (causing a short between windings or to the core) or even fatigue and break the wire.


Comment