Help me identify these parts

I Just got a ttr 125 2002.  I know it needs some work and I like the project, but I could use a hand in identifying some  parts and a possible serious problem


What is this gear called in pic one


I dont think this gear is supposed to come out, and whats inside is sheared off. Is this repairable? 


There also looks to be a small crack in casings, about exactly where my marker is.   Its hardly noticeable.  Is this a huge concern?




Trans output shaft?

Idler gear?

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