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Look up your year and model, then select the transmission category. It'll give a numbered parts diagram, then you can go down to the list below it, add it to your cart, and it'll give you the yamaha part number
AWESOME MAN THANKS ALOT!!! its the 2nd gear pinion (19 teeth) and its the cheapest gear in the whole motor! its only $21.52! thanks alot all - fanninator