02 yz426f 5th gear swap with wr 5th

hi guys been awile  ,ol bike ..I bought it new an its been sitting for bout 6 years now  ....was rebuilt  season 2 and month later 5th gear jumping out at half throttle ,just putted around on it season 3 an never fixed it ..lol..had another baby ,lol..so she got put in back corner.....now I want to bring her back out before my back goes on me and feel what it was like to ride again...I guess big question first ..will wr 5th  work in my yz...I was also going to swap out rear shock spring for heavier..i am 250lbs trail rider any thoughts on spring size :confused:  thanks

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