Cr 125 help

I got a 2003 cr 125 around 2 months or so ago. At first it just needed a new top end. After we put that in and started riding it, I noticed when I shifted into 4th gear it would rev like in neutral. It never ignites into gear. Just revs. Every other gear works 1-3 and 5th. Shifts smooth in all those. Does anyone know what it could possibly be causing this?

you have a bad 4th gear set in the transmission and/or bend shift forks. time to split the cases

you have a bad 4th gear set in the transmission and/or bend shift forks. time to split the cases

How much could that run me? Money wise for the parts

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