YZ250X Seal Housing

Hey guys so today i went for a ride and ended up with a flat rear when i came home i had noticed the seal was out a little bit upon further inspection it looks like this 

I can push it back in but comes out again really easy, Bike only has around 70hrs

Looks like a small job for replacement but just wondering should i replace the gasket thats there aswell ?????? Witch is part number 39 on parts diagram photo

I have no idea how this could have happened 

 

Thanks

 

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Might not have been installed properly after a top end rebuild.

Just take the plate off and put it back in if it’s not damaged.

Replace if damaged but don’t worry about the gasket.

This is a stock bike have not touch anything  on it yet 

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