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

    SE116, 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 curren...

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

    SE106, LOWER (Replaces Mercruiser Alpha One)

    SEI Marine
    €1.090,20 - €1.090,20
    €1.090,20
    €1.090,20 - €1.090,20
    €1.090,20
    In stock

    Please click here for application assistance. We are generally able to ship the following business day.We will notify you by email of the current...

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

    SE116 1.47 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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  • SE106 1.47 Complete (Replaces Mercruiser's Alpha One) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE106 1.47 Complete (Replaces Mercruiser's Alpha One)

    SEI Marine
    €2.005,60 - €2.005,60
    €2.005,60
    €2.005,60 - €2.005,60
    €2.005,60
    In stock

    Please click here for application assistance. Replaces most Mercruiser Sterndrives 228 HP and up from 1974-1990. Ships in two boxes. Comes with ...

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

    SE128 Lower 1.65 Ratio (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 1.65 RatioFits Bravo Three® 1.65 Ratio OE #1656-8866A36 Not a replacement for Bravo X,XR or XZ drives. Has newer style case with the ...

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

    SE116 1.81 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, UPPER 1.47 (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116, UPPER 1.47 (Replaces Mercruiser Gen II)

    SEI Marine
    €1.090,20 - €1.090,20
    €1.090,20
    €1.090,20 - €1.090,20
    €1.090,20
    In stock

    The 1.47 ratio replaces the 1.5 ratio

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

    SE116, UPPER 1.81 (Replaces Mercruiser Gen II)

    SEI Marine
    €1.090,20 - €1.090,20
    €1.090,20
    €1.090,20 - €1.090,20
    €1.090,20
    In stock

    The 1.81 ratio replaces the 1.84 ratio We are generally able to ship the following business day however, during the summer there may be a delay. ...

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

    SE106 1.81 Complete (Replaces Mercruiser's Alpha One)

    SEI Marine
    €2.005,60 - €2.005,60
    €2.005,60
    €2.005,60 - €2.005,60
    €2.005,60
    In stock

    Please click here for application assistance. Replaces most Mercruiser Sterndrives 165-205 HP and up from 1976-1990. Typically used on V6 engine...

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  • SE106, UPPER 1.47 (Replaces Mercruiser Alpha One) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE106, UPPER 1.47 (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 1.47 ratio also replaces the 1.5 ratio Comes with a 9-9/16 new style input yoke. We are general...

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  • SE128 Complete 2.43 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 Complete 2.43 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 2.43 Complete Replaces Mercruiser Bravo Three® 2.43Ratio Dual Water Intakes. OE# 5441700TP Not a replacement for Bravo X,XR or XZ drives. Rat...

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  • SE128 Complete 2.00 Ratio (Replaces Bravo Three®) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement
    Sold out

    SE128 Complete 2.00 Ratio (Replaces Bravo Three®)

    SEI Marine
    €4.066,40 - €4.066,40
    €4.066,40
    €4.066,40 - €4.066,40
    €4.066,40
    Out of stock

    SE128 2.00 Complete Replaces Mercruiser Bravo Three 2.00 Ratio Dual Water Intakes. OE# 5441600TP Not a replacement for Bravo X,XR or XZ drives. Rat...

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  • SE128 Lower 2.43 Ratio (Replaces Bravo Three® Lowers) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE128 Lower 2.43 Ratio (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 LowerFits Bravo Three® 2.43 RatioNot a replacement for Bravo X,XR or XZ drives. Has newer style case with the oil recirculation system toward...

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  • SE128 Lower 1.81, 2.00 & 2.20 Ratio's (Replaces Bravo Three® Lowers) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement
    Sold out

    SE128 Lower 1.81, 2.00 & 2.20 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
    Out of stock

    SE128 Lower 1.81, 2.00 and 2.20 Ratio'sFits Bravo Three® 1.81, 2.00 and 2.20 Ratio'sNot a replacement for Bravo X,XR or XZ drives. Has newer style ...

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  • SE121 Upper 32/27 Tooth Count(Replaces Bravo Upper) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement
    Sold out

    SE121 Upper 32/27 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
    Out of stock

    SE121 Upper 32/27 Tooth CountFits Bravo 1 1.5 RatioFits Bravo 2 1.65 and 2.00 Ratio'sFits Bravo 3 1.5, 1.65 and 2.00 Ratio'sNot a replacement for B...

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  • SE121 Upper 30/23 Tooth Count(Replaces Bravo Upper) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE121 Upper 30/23 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 30/23 Tooth CountFits Bravo 1 1.65 RatioFits Bravo 2 2.20 RatioFits Bravo 3 2.20 and 2.43 Ratio'sNot a replacement for Bravo X,XR or XZ...

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  • SE116 2.00 Complete (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116 2.00 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. This item is to replace 2.00 Ratio drives ...

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

    SE116 1.62 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...

    View full details
  • SE116, COUNTER ROTATING LOWER (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116, COUNTER ROTATING LOWER (Replaces Mercruiser Gen II)

    SEI Marine
    €1.352,40 - €1.352,40
    €1.352,40
    €1.352,40 - €1.352,40
    €1.352,40
    In stock

    To replace Counter Rotation units only. Do not use for standard rotation. We are generally able to ship the following business day however, during ...

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  • SE116, UPPER 1.62 / 2.0 (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116, UPPER 1.62 / 2.0 (Replaces Mercruiser Gen II)

    SEI Marine
    €1.090,20 - €1.090,20
    €1.090,20
    €1.090,20 - €1.090,20
    €1.090,20
    In stock

    The 1.62 ratio replaces the 1.65 and the 2.0 ratio

  • SE116, UPPER 1.94 / 2.40 (Replaces Mercruiser Gen II) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE116, UPPER 1.94 / 2.40 (Replaces Mercruiser Gen II)

    SEI Marine
    €1.090,20 - €1.090,20
    €1.090,20
    €1.090,20 - €1.090,20
    €1.090,20
    In stock

    The 1.94 ratio replaces the 1.98 and the 2.4 ratios We are generally able to ship the following business day however, during the summer there may ...

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

    SE106 1.94 Complete (Replaces Mercruiser's Alpha One)

    SEI Marine
    €2.005,60 - €2.005,60
    €2.005,60
    €2.005,60 - €2.005,60
    €2.005,60
    In stock

    Please click here for application assistance. Ships in two boxes. Comes with a 9-9/16 new style input yoke. Does not include Complete Install Kit...

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  • SE106 1.62 Complete (Replaces Mercruiser's Alpha One) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE106 1.62 Complete (Replaces Mercruiser's Alpha One)

    SEI Marine
    €2.005,60 - €2.005,60
    €2.005,60
    €2.005,60 - €2.005,60
    €2.005,60
    In stock

    Please click here for application assistance. Replaces most Mercruiser Sterndrives 205 HP from 1983-1990. Ships in two boxes. Comes with a 9-9/1...

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  • SE108, COUNTER ROTATING LOWER (Replaces Mercruiser Alpha One) - SEI Marine - Mercruiser, OMC Cobra, Mercury, Yamaha, Johnson/Evinrude Replacement

    SE108, COUNTER ROTATING LOWER (Replaces Mercruiser Alpha One)

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

    Please click here for application assistance. To replace Counter Rotation units only. Do not use for standard rotation. We are generally able to...

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