4 speed into a 5 speed

has anybody tryed to convert there YZ 450 4 speed into a WR 5 speed i want to do this :thumbsup: it looks like all the gears drum and maybe the cases too :awww:

SFO has done it. Requires a COMPLETE transmission, including forks and drum plus machine work. Search back one year for:

yz 5sp

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