Suzuki’s gears in their off-road machines have had these problems for over 30 years.  The premature erosion on the load-carrying surface on the teeth shows up on their 80cc stuff all the way to the LT 500.

It is my opinion that Suzuki does not use the same alloys and heat treatment that they use in their street bikes or the process that other manufactures use on their off-road machines.  I seldom see this cancer on the gears teeth on the other brands of off-road machines.

Cryo or micro-polishing may help but I do not believe that it is going to fix this metallurgical problem.  This problem is most common on third gear on the LT 500.  Third gear is typically the gear that gets the most use.