43-18411A 2 - Gear Set -1.50:1

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Part Number
43-18411A 2

Mercury Quicksilver

Upper Gear Kit 20-22 teeth, 1.50/1.47 ratio Fits MC-I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1971-1997)

You could also consider getting OMC 0775510 - Upper Gear Set. It is the same gear set and might be less expensive.

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Mercury Quicksilver Gear Set-1.50:1 43-18411a 2 is equivalent to parts:

Mercury Marine produces the Quicksilver line of parts. Quicksilver parts are made for use on Mercury, Mariner, MerCruiser & Force engines. In addition, they cover many applications by the following engine manufacturers: Chris-Craft, Chrysler, Crusader, Evinrude, Johnson, Honda, OMC, PCM, Suzuki, Volvo Penta, & Yamaha.