Chewed gears after 3 years

After 3,5 years opened engine, working normally, noticed this eaten up gears.

Its 4th gear in a '99 WR

When I bought the bike, 3rd and 4th gear were just replaced.

Did 5000 miles max since.

this gear had only one tooth eaten

its co-working brother gear looked like this

and thats a new one, wating to turn fast.

Some say 3 in 4 gear are the weak points of wr's, think I avoided disaster of broken gears, what already happened to this bike once.

The only tranny problems I've known of was on the '03 WR450's. They had issues with 3rd and 4th gear grenading and following years had upgraded parts.

ANY transmission can be broken with abuse though.

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