03 yz450f

i have a 2003 yz450f i wish it really had 5 gears...is there anyway i could get 5 gears. i always find myself wanting the 5th gear. im not to sure if its possible of getting the 5th gear in it but i thought id ask.. thanks

the next generation of the yz's 06-08 or something like that had 5 gears. so idk i just thought id see what you guys had to say on here

no i havent, im real new to this site

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