Mercury / Mariner / Force GEAR HOUSING GEARS - INLINE 6 (90-150 HP) L6 90 HP Serial No. 4845301 & Up (1978-86) L6 115 HP Serial No. 4855153 & Up (1978-89) L6 140 HP Serial No. 4865678 & Up (1978-81) L6 150 HP Serial No. 3502806 & Up (1973-78) 2.0:1 Ratio (14:28 Teeth)
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