Sterndrive Engineering

      • SEI Yamaha V6 2 Stroke 1.81:1 20" Shaft Repl Lower Unit
        List Price: $1,441.00
        Starting At: $1,200.00

        SEI Yamaha V6 2 Stroke 1.81:1 20" Shaft Repl Lower Unit Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number...

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      • SEI Yamaha 76° V6 4 Stroke 25" 2:1 Repl Lower Unit
        List Price: $1,439.99
        Starting At: $1,199.99

        SEI Yamaha 76° V6 4 Stroke 25" 2:1 Repl Lower Unit Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number...

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      • SEI Yamaha 76° V6 1.81:1 Repl Lower Unit
        List Price: $1,439.99
        Starting At: $1,199.99

          SEI Yamaha 76° V6 2 Stroke 1.81:1 Repl Lower Unit Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial...

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      • SEI Yamaha 90­° V6 Repl Lower Unit 1.86:1 25" Counter
        List Price: $1,679.99
        Starting At: $1,399.99

        SEI Yamaha 90° V6 25" 1.86:1 Replacement Lower Unit - Counter Rotation Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your...

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      • SEI Yamaha 90­° V6 Repl Lower Unit 2:1 25"
        List Price: $1,439.99
        Starting At: $1,199.99

        SEI Yamaha 90­° V6 Repl Lower Unit 2:1 25" Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready...

        Add to Cart
      • SEI Yamaha 2 Stroke V4 Repl Lower Unit 2:1 20"
        List Price: $1,439.99
        Starting At: $1,199.99

        SEI Yamaha 2 Stroke V4 Repl Lower Unit 2:1 20" Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready...

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      • SEI Mercruiser Outboard 4.3L Repl Upper Unit 1.81
        List Price: $1,289.99
        Starting At: $1,074.99

        SEI Mercruiser Outboard 4.3L Repl Upper Unit 1.81 Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready...

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      • SEI Alpha One & Bravo Hydraulic Port Hose
        List Price: $95.99
        Starting At: $79.99

        SEI Alpha One & Bravo Hydraulic Port Hose These are replacement hoses for Mercruiser Alpha 1 and Bravo hydraulic trim cylinders. 9B-104-02 Replaces OEM# 98703A3 9B-121-02 Replaces OEM#...

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      • SEI Complete S/S Trim Pump Assembly
        List Price: $509.99
        Starting At: $424.99

        SEI Complete S/S Trim Pump Assembly The SEI Trim Pump assembly features a stainless steel mounting bracket and works as a replacement for OE#865380A25

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      • SEI OMC Cobra Conversion Kit
        List Price: $719.99
        Starting At: $599.99

        SEI OMC Cobra Conversion Kit The SEI is designed to replace 1986-1993 Cobra drives that shift in the lower unit. Does NOT replace King Cobra drives. If using a fuel injected motor with the shift...

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      • SEI Alpha 1 Gen1 Mercruiser Hose Kit
        List Price: $149.99
        Starting At: $124.99

        SEI Alpha 1 Gen1 Mercruiser Hose Kit for External Line Cylinders These are replacement hoses for 9B-102-01 Trim Cylinders.

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      • SEI 90° Johnson/Evinrude 25" Drive Shaft
        List Price: $238.79
        Starting At: $198.99

        SEI 90° Johnson/Evinrude 25" Drive Shaft Replaces V4/V6 90° from 1976-1991 Cross Reference: OE# 435761 5000626 Aqua Power 2859 GLM 22432  

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      • SEI 60° Johnson/Evinrude 20" Drive Shaft
        List Price: $238.79
        Starting At: $198.99

        SEI 60° Johnson/Evinrude 20" Drive Shaft Replaces V4/V6 60° from 1991-2006 Cross Reference: OE# 436234 5000615 Aqua Power 2865 GLM 22435  

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      • SEI 90° Johnson/Evinrude 20" Drive Shaft
        List Price: $238.79
        Starting At: $198.99

        SEI 90° Johnson/Evinrude 20" Drive Shaft Replaces V4/V6 90° from 1992-2006 Cross Reference: OE# 436232 5000614 Aqua Power 2860 GLM 22433  

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      • SEI Mercruiser  Alpha 1 Propshaft 6 Jaw
        List Price: $419.99
        Starting At: $349.99

        Sterndrive Engineering Alpha 1 Propshaft 6 Jaw Fits: Mercruiser I,R,MR Alpha I & Gen II drives 1973 to current Standard Right Hand Rotation Mercury Outboard 70-125 HP Metric Inline...

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