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2012 rmz250 transmission swap

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Hi guys, I have a 2012 rmz250 that I’ve owned since new. Ever since I got the bike it’s always had a rubber transmission. I’ve done the detent spring, upgraded clutch springs, ext. only to have the false neutrals come back. I seen someweres someone saying to swap the transmission out with a 2013 transmission. From what I have read they will swap right out with each other but u have to change the counter shaft bearing out bc the 2013 shaft is bigger that the 12. My question is, is the countershaft bearing the only thing I would have to change out to make the 13 transmission work, and by transmission I mean the gear stacks, shift forks,shift drum,shift start and the shift mechanism on the clutch side. Thanks for the help 

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Yes just the counter shaft bearing.then the complete 2013 transmission as you stated.

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