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SEI Marine will be closed December 23rd – January 7th for holidays
SEI Marine will be closed December 23rd – January 7th for holidays

Mercruiser Alpha One Gen I/II Sterndrives & Bravo Replacement Drives

Aftermarket replacement drives for Mercruiser Alpha One Gen I Sterndrives, Mercruiser Alpha One Gen II Sterndrives & Mercruiser Bravo. Lower Units, Upper Units, Complete Drives and Counter Rotation.

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  • SE106, UPPER 1.81 (Replaces Mercruiser Alpha One) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE106, UPPER 1.81 (Replaces Mercruiser Alpha One)

    SEI Marine
    €1.002,80 - €1.002,80
    €1.002,80
    €1.002,80 - €1.002,80
    €1.002,80
    In stock

    Please click here for application assistance. The 1.81 ratio also replaces the 1.84 ratio Comes with a 9-9/16 new style input yoke. We are genera...

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  • SE106, UPPER 1.94 (Replaces Mercruiser Alpha One) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE106, UPPER 1.94 (Replaces Mercruiser Alpha One)

    SEI Marine
    €1.002,80 - €1.002,80
    €1.002,80
    €1.002,80 - €1.002,80
    €1.002,80
    In stock

    Please click here for application assistance. The 1.94 ratio also replaces the 1.98 ratio Comes with a 9-9/16 new style input yoke. We are genera...

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  • SE128 Complete 2.20 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 Complete 2.20 Ratio (Replaces Bravo Three®)

    SEI Marine
    €4.066,40 - €4.066,40
    €4.066,40
    €4.066,40 - €4.066,40
    €4.066,40
    Low stock

    SE128 2.20 Ratio Complete Replaces Mercruiser Bravo Three 2.20 Ratio Dual Water Intakes. OE# 5441500TP Not a replacement for Bravo X,XR or XZ drive...

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  • SE128 Complete 1.81 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 Complete 1.81 Ratio (Replaces Bravo Three®)

    SEI Marine
    €4.066,40 - €4.066,40
    €4.066,40
    €4.066,40 - €4.066,40
    €4.066,40
    Low stock

    SE128 1.81 Complete Replaces Mercruiser Bravo Three® 1.81 Ratio Dual Water Intakes. OE# 5441100TP Not a replacement for Bravo X,XR or XZ drives. R...

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  • SE128 Complete 1.65 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 Complete 1.65 Ratio (Replaces Bravo Three®)

    SEI Marine
    €4.066,40 - €4.066,40
    €4.066,40
    €4.066,40 - €4.066,40
    €4.066,40
    In stock

    SE128 1.65 Complete Replaces Mercruiser Bravo Three® 1.65 Ratio Dual Water Intakes. OE# 5441300TP Not a replacement for Bravo X,XR or XZ drives. R...

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  • SE128 Complete 1.5 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 Complete 1.5 Ratio (Replaces Bravo Three®)

    SEI Marine
    €4.066,40 - €4.066,40
    €4.066,40
    €4.066,40 - €4.066,40
    €4.066,40
    In stock

    SE128 1.5 Ratio Complete Replaces Mercruiser Bravo Three® 1.5 Ratio Dual Water Intakes. OE# 5441200TP Not a replacement for Bravo X,XR or XZ drive...

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  • SE128 Complete 1.36 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement
    SE128 Complete 1.36 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 Complete 1.36 Ratio (Replaces Bravo Three®)

    SEI Marine
    €4.066,40 - €4.066,40
    €4.066,40
    €4.066,40 - €4.066,40
    €4.066,40
    In stock

    SE128 Complete 1.36 Ratio Replaces Mercruiser Bravo Three® 1.36 Ratio Dual Water Intakes. OE# 5441100TP Not a replacement for Bravo X,XR or XZ dri...

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  • SE121 Complete 1.65 Ratio Dual Water Inlet (Replaces Bravo One®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Complete 1.65 Ratio Dual Water Inlet (Replaces Bravo One®)

    SEI Marine
    €3.298,20 - €3.298,20
    €3.298,20
    €3.298,20 - €3.298,20
    €3.298,20
    In stock

    SE121 1.65 Complete Replaces Mercruiser Bravo One® 1.65 Ratio with Dual Water Inlets. OE# 5231300TP Not a replacement for Bravo X,XR or XZ drives. ...

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  • SE121 Complete 1.5 Ratio Dual Water Inlet (Replaces Bravo One®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Complete 1.5 Ratio Dual Water Inlet (Replaces Bravo One®)

    SEI Marine
    €3.298,20 - €3.298,20
    €3.298,20
    €3.298,20 - €3.298,20
    €3.298,20
    In stock

    SE121 Complete Replaces Mercruiser Bravo One® 1.5 Ratio with Dual Water Inlets. OE# 5231200TP Not a replacement for Bravo X,XR or XZ drives. Rated ...

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  • SE121 Complete 1.36 Ratio Dual Water Inlet (Replaces Bravo One®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Complete 1.36 Ratio Dual Water Inlet (Replaces Bravo One®)

    SEI Marine
    €3.298,20 - €3.298,20
    €3.298,20
    €3.298,20 - €3.298,20
    €3.298,20
    In stock

    SE121 Complete 1.36 Ratio Replaces Mercruiser Bravo One® 1.36 Ratio with Dual Water Inlets. OE# 5231100TP Not a replacement for Bravo X,XR or XZ dr...

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  • SE121 Complete 1.65 Ratio Side Water Inlet (Replaces Bravo One®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Complete 1.65 Ratio Side Water Inlet (Replaces Bravo One®)

    SEI Marine
    €3.298,20 - €3.298,20
    €3.298,20
    €3.298,20 - €3.298,20
    €3.298,20
    In stock

    Replaces Mercruiser Bravo One® 1.36 Ratio with Side Water Inlets. OE# 5120165KZ Not a replacement for Bravo X,XR or XZ drives. Rated for up to 425H...

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  • SE121 Complete 1.5 Ratio Side Water Inlet (Replaces Bravo One® - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Complete 1.5 Ratio Side Water Inlet (Replaces Bravo One®

    SEI Marine
    €3.298,20 - €3.298,20
    €3.298,20
    €3.298,20 - €3.298,20
    €3.298,20
    In stock

    SE121 Complete 1.5 Ratio Replaces Mercruiser Bravo One 1.5 Ratio with Side Water Inlets. OE# 5120150KZ Not a replacement for Bravo X,XR or XZ drive...

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  • SE121 Complete 1.36 Ratio Side Water Inlet (Replaces Bravo One®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Complete 1.36 Ratio Side Water Inlet (Replaces Bravo One®)

    SEI Marine
    €3.298,20 - €3.298,20
    €3.298,20
    €3.298,20 - €3.298,20
    €3.298,20
    In stock

    SE121 Complete 1.36 Ratio. Replaces Mercruiser Bravo One® 1.36 Ratio with Side Water Inlets. OE# 5120136KZ Not a replacement for Bravo X,XR or XZ d...

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  • SE128 1.36 & 1.5 Ratio's (Replaces Bravo Three® Lowers) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 1.36 & 1.5 Ratio's (Replaces Bravo Three® Lowers)

    SEI Marine
    €1.881,40 - €1.881,40
    €1.881,40
    €1.881,40 - €1.881,40
    €1.881,40
    Low stock

    SE128 Lower 1.36 and 1.5 Ratio'sFits Bravo Three® 1.36 and 1.5 Ratio's Not a replacement for Bravo X,XR or XZ drives. Has newer style case with the...

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  • SE121 Upper 29/27 Tooth Count (Replaces Bravo Upper) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Upper 29/27 Tooth Count (Replaces Bravo Upper)

    SEI Marine
    €2.309,20 - €2.309,20
    €2.309,20
    €2.309,20 - €2.309,20
    €2.309,20
    Low stock

    SE121 Upper 29/27 Tooth CountFits Bravo 1 1.36 RatioFits Bravo 2 1.5 and 1.81 Ratio'sFits Bravo 3 1.36 and 1.81 Ratio's OE #1589-8868H87 Not a re...

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  • SE116 2.40 Complete (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement
    Sold out

    SE116 2.40 Complete (Replaces Mercruiser Gen II)

    SEI Marine
    €2.180,40 - €2.180,40
    €2.180,40
    €2.180,40 - €2.180,40
    €2.180,40
    Out of stock

    Ships in two boxes. Does not Include Complete Install Kit or Anode Kit. Please see related items below. This item is to replace 2.40 Ratio drives ...

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  • SE122 DUAL WATER PICKUP (Replaces Bravo One Lower) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE122 DUAL WATER PICKUP (Replaces Bravo One Lower)

    SEI Marine
    €1.265,00 - €1.265,00
    €1.265,00
    €1.265,00 - €1.265,00
    €1.265,00
    In stock

    This item is to replace 1992 and up Bravo One's with the oil passage. It can be modified to backfit 1988-1991. This unit has side and low water int...

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  • SE121 SINGLE WATER PICKUP (Replaces Bravo One Lower) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 SINGLE WATER PICKUP (Replaces Bravo One Lower)

    SEI Marine
    €1.265,00 - €1.265,00
    €1.265,00
    €1.265,00 - €1.265,00
    €1.265,00
    In stock

    This item is to replace 1992 and up Bravo One's with the oil passage. It can be modified to backfit 1988-1991. This unit has side water intakes onl...

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  • SE116 1.94 Complete - C.R. (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116 1.94 Complete - C.R. (Replaces Mercruiser Gen II)

    SEI Marine
    €2.355,20 - €2.355,20
    €2.355,20
    €2.355,20 - €2.355,20
    €2.355,20
    In stock

    Ships in two boxes. Counter rotation unit, do not use for standard rotation. Ships in two boxes. Comes with a 9-9/16 new style input yoke. Does not...

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  • SE116 1.81 Complete - C.R. (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116 1.81 Complete - C.R. (Replaces Mercruiser Gen II)

    SEI Marine
    €2.355,20 - €2.355,20
    €2.355,20
    €2.355,20 - €2.355,20
    €2.355,20
    In stock

    Ships in two boxes. Counter rotation unit, do not use for standard rotation. Ships in two boxes. Comes with a 9-9/16 new style input yoke. Does not...

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  • SE116 1.62 Complete - C.R. (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116 1.62 Complete - C.R. (Replaces Mercruiser Gen II)

    SEI Marine
    €2.355,20 - €2.355,20
    €2.355,20
    €2.355,20 - €2.355,20
    €2.355,20
    In stock

    Ships in two boxes. Counter rotation unit, do not use for standard rotation. Ships in two boxes. Comes with a 9-9/16 new style input yoke. Does not...

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  • SE116 1.47 Complete - C.R. (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116 1.47 Complete - C.R. (Replaces Mercruiser Gen II)

    SEI Marine
    €2.355,20 - €2.355,20
    €2.355,20
    €2.355,20 - €2.355,20
    €2.355,20
    In stock

    OE# 5111200LP Ships in two boxes. Counter rotation unit, do not use for standard rotation. Ships in two boxes. Comes with a 9-9/16 new style inpu...

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  • SE116 1.94 Complete (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116 1.94 Complete (Replaces Mercruiser Gen II)

    SEI Marine
    €2.180,40 - €2.180,40
    €2.180,40
    €2.180,40 - €2.180,40
    €2.180,40
    In stock

    Ships in two boxes. Does not Include Complete Install Kit or Anode Kit. Please see related items below. We are generally able to ship the following...

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  • SE116, HA LOWER (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116, HA LOWER (Replaces Mercruiser Gen II)

    SEI Marine
    €1.177,60 - €1.177,60
    €1.177,60
    €1.177,60 - €1.177,60
    €1.177,60
    In stock

    We are generally able to ship the following business day however, during the summer there may be a delay. We will notify you by email of the curre...

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