need major yzf help

i have an 04 yz450f. i had to replace the cases and i found that the gear in the kickstart assembly has a broken tooth. i found the assembly for an 06 and nobody can tell me if it will work. yamaha themself couldnt tell me. if anybody knows please help

Part numbers are different so I can't imagine them interchanging. By the way move this to the YZ450 forum and you might find better help.

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