wierd shifting on a 2004 predator

[1fst250r]

Hey guys I hope you can help. I'm working on a 2004 polaris predator that when your in high RPM's it shifts from 2nd to 3rd automatically any body know what might cause this? please help

[blasterboy16]

is the shift drum worn out?

[katch26]

There are alot of parts that will do the same thing in the transmission gear dogs, shift forks, could really be anything. I would say bad shift fork.

[motohed]

i agree with katch bent shift forks are the number 1 afender of shifting problems in most cases