SEI New SEI / MerCruiser Alpha One Short Input Yoke Shaft (1972–1990) – 8-1/8" – Fits Inline 4 & Inline 6 Engines – Replaces OEM 39385A1 MSRP: Was: Now: $96.93 Choose Options
SEI New SEI / MerCruiser Alpha One Heavy Duty U-Joint (1970–1997) – Greasable – Replaces OEM 3850812 / 75832T1 – Also Fits OMC Cobra & Volvo Penta SX MSRP: Was: Now: $36.70 Add to Cart
SEI New SEI / MerCruiser Alpha One H-Yoke (1972–1990) – Replaces OEM 0912213 – Serial Numbers OK999999 and Below MSRP: Was: Now: $47.95 Choose Options
SEI New SEI / MerCruiser Alpha One Short Yoke Shaft (1972–1997) – Replaces OEM 46020 1 – Serial Numbers OK999999 and Below MSRP: Was: Now: $74.13 Choose Options
SEI New SEI / MerCruiser Alpha One Engine End Yoke Shaft (1972–1990) – 9-9/16" – Replaces OEM 0912212 / 814819A3 MSRP: Was: Now: $95.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II 6-Jaw Propshaft (1972–Present) – Standard Rotation – Replaces OEM 44-850308 / 44-824110 MSRP: Was: Now: $300.95 Choose Options
SEI New SEI / MerCruiser Alpha One Driveshaft (1972–1990) – Replaces OEM 45-55796 – Not for Gen II Drives MSRP: Was: Now: $75.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Stainless Trim Pump Assembly (1986–Present) – Replaces OEM 865380A25 MSRP: Was: Now: $400.00 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Trim Pump Assembly (1986–Present) – Replaces OEM 865380A25 MSRP: Was: Now: $300.00 Choose Options
SEI New SEI / Yamaha V6 200–225 HP 4-Stroke Gear Set (2002–Present) – Counter Rotation – 2:1 Ratio – Replaces OEM 6J9-45551-00-00 MSRP: Was: Now: $677.05 Add to Cart
SEI New SEI / Yamaha V6 200–225 HP 4-Stroke Gear Set (2002–Present) – Standard Rotation – 2:1 Ratio – Replaces OEM 69J-45551-00-00 MSRP: Was: Now: $648.07 Add to Cart
SEI New SEI / Yamaha V6 225–250 HP 3.1L / 3.2L 2-Stroke Gear Set (1990–Present) – Standard Rotation – 1.81:1 Ratio – Replaces OEM 61A-45551-03-00 MSRP: Was: Now: $601.11 Add to Cart
SEI New SEI / Yamaha 150 HP 4-Stroke Gear Set (2004–Present) – Counter Rotation – 2:1 Ratio – Replaces OEM 63P-45551-00-00 MSRP: Was: Now: $774.40 Add to Cart
SEI New SEI / Yamaha V6 150–200 HP 2.6L 2-Stroke Gear Set (1992–Present) – Counter Rotation – 1.86:1 Ratio – Replaces OEM 6G5-45551-10-00 MSRP: Was: Now: $579.88 Add to Cart
SEI New SEI / Yamaha V6 150 HP 2-Stroke 2:1 Gear Set (1987–Present) – Standard Rotation – Complete Gear Set MSRP: Was: Now: $492.17 Add to Cart
SEI New SEI / Yamaha V6 150–225 HP 2-Stroke 1.86:1 Gear Set (1991–Present) – Standard Rotation – Complete Gear Set MSRP: Was: Now: $453.87 Add to Cart
SEI New SEI / Yamaha V4 115–130 HP 2-Stroke 2:1 Gear Set (1984–Current) – Standard Rotation – Complete Gear Set MSRP: Was: Now: $426.69 Add to Cart
SEI New SEI / Mercruiser Alpha 1 Gen II 4-CYL/V6/V8 Complete Sterndrive Assembly (1991-2003) MSRP: Was: Now: $1,935.00 Choose Options
SEI New SEI / Yamaha V6 3.1/3.3L 76° Standard-Rotation Gearcase (1990-2009) MSRP: Was: Now: $1,195.00 Choose Options
SEI New SEI / Mercruiser 1972-1990 4-CYL/V6/V8 R/MR/ & Alpha 1 Complete Sterndrive Assembly MSRP: Was: Now: $1,935.00 Choose Options
SEI New SEI / Mercruiser 1972-1982 4-CYL/V6/V8 R/MR/ & Alpha 1 (Short Yoke) Complete Sterndrive Assembly MSRP: Was: Now: $1,935.00 Choose Options
SEI Mercury & Mariner 3.0 L V6 S/N 0G960500 & UP 20" (L) Double Upper Bearing Driveshaft OEM # 45-881938 MSRP: Was: Now: $187.22 Choose Options
SEI New SEI / OMC Sterndrive 6/8 Cylinder Stringer/800 Series Seal Kit OEM # 982946 MSRP: Was: Now: $47.00 Choose Options
SEI New SEI / Mercruiser Bravo I, II & III Sterndrive Bellows Repair Kit OEM # 30-803100T1 MSRP: Was: Now: $120.00 Choose Options
SEI New SEI / Mercruiser 1992-Up Alpha 1 Gen II Bellows Repair Kit OEM # 30-803099T1 MSRP: Was: Now: $120.00 Choose Options
SEI New SEI / Mercruiser 1972-1991 Alpha 1 Transom Bellows Repair Kit MSRP: Was: Now: $120.00 Choose Options
SEI New SEI / Mercury & Mariner 3.0 L V6 S/N 0G960500 & UP 25" (XL) Double Upper Bearing Driveshaft OEM # 881942 MSRP: Was: Now: $180.39 Choose Options
SEI New SEI / Mercruiser 1984-1990 Alpha 1 4-CYL/V6/V8 Complete Counter-Rotation Sterndrive Assembly MSRP: Was: Now: $2,165.00 Choose Options
SEI New SEI / Mercruiser 1984-1990 Alpha 1 4-CYL/V6/V8 Complete Counter-Rotation (Short Yoke) Sterndrive Assembly MSRP: Was: Now: $2,165.00 Choose Options
SEI New SEI / MerCruiser Alpha One Short Input Yoke Shaft (1972–1990) – 8-1/8" – Fits Inline 4 & Inline 6 Engines – Replaces OEM 39385A1 This SEI Marine Short Input Yoke Shaft is a direct replacement for MerCruiser Alpha One sterndrives (1972–1990) and is designed to fit old-style inline 4-cylinder and inline 6-cylinder engines... MSRP: Was: Now: $96.93 Choose Options
SEI New SEI / MerCruiser Alpha One Heavy Duty U-Joint (1970–1997) – Greasable – Replaces OEM 3850812 / 75832T1 – Also Fits OMC Cobra & Volvo Penta SX This SEI Marine Heavy Duty U-Joint is designed for MerCruiser Alpha One sterndrives (1972–1990) and compatible with select OMC Cobra (1986–1997) and Volvo Penta SX (Joint Venture... MSRP: Was: Now: $36.70 Add to Cart
SEI New SEI / MerCruiser Alpha One H-Yoke (1972–1990) – Replaces OEM 0912213 – Serial Numbers OK999999 and Below This SEI Marine H-Yoke is a direct aftermarket replacement for MerCruiser I, R, MR, Alpha One, and Alpha One Gen II Sterndrives produced from 1972 to 1990. Designed for applications with serial... MSRP: Was: Now: $47.95 Choose Options
SEI New SEI / MerCruiser Alpha One Short Yoke Shaft (1972–1997) – Replaces OEM 46020 1 – Serial Numbers OK999999 and Below This SEI Marine Short Yoke Shaft is a direct aftermarket replacement for MerCruiser I, R, MR, Alpha One, and Alpha One Gen II Sterndrives manufactured between 1972 and 1997. Designed for applications... MSRP: Was: Now: $74.13 Choose Options
SEI New SEI / MerCruiser Alpha One Engine End Yoke Shaft (1972–1990) – 9-9/16" – Replaces OEM 0912212 / 814819A3 This SEI Marine Engine End Yoke Shaft is a direct aftermarket replacement for MerCruiser Alpha One sterndrives manufactured from 1972 to 1990. Measuring 9-9/16" in length, this yoke fits all... MSRP: Was: Now: $95.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II 6-Jaw Propshaft (1972–Present) – Standard Rotation – Replaces OEM 44-850308 / 44-824110 This SEI Marine 6-Jaw Propshaft is a direct aftermarket replacement for MerCruiser Alpha One and Alpha One Gen II Sterndrives from 1972 to present. Engineered for standard rotation applications, it... MSRP: Was: Now: $300.95 Choose Options
SEI New SEI / MerCruiser Alpha One Driveshaft (1972–1990) – Replaces OEM 45-55796 – Not for Gen II Drives This SEI Marine Driveshaft is a direct aftermarket replacement for MerCruiser I, R, MR, and Alpha One Sterndrives manufactured from 1972 to 1990. It is designed to meet or exceed OEM performance... MSRP: Was: Now: $75.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Stainless Trim Pump Assembly (1986–Present) – Replaces OEM 865380A25 This SEI Marine Trim Pump Assembly is a direct aftermarket replacement for MerCruiser Alpha One and Alpha One Gen II Sterndrives manufactured from 1986 to present. Designed for optimal performance... MSRP: Was: Now: $400.00 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Trim Pump Assembly (1986–Present) – Replaces OEM 865380A25 This SEI Marine Trim Pump Assembly is a direct aftermarket replacement for MerCruiser Alpha One and Alpha One Gen II Sterndrives manufactured from 1986 to present. Designed for optimal performance... MSRP: Was: Now: $300.00 Choose Options
SEI New SEI / Yamaha V6 200–225 HP 4-Stroke Gear Set (2002–Present) – Counter Rotation – 2:1 Ratio – Replaces OEM 6J9-45551-00-00 This SEI Marine Complete Gear Set is a direct aftermarket replacement for Yamaha V6 4-Stroke 200–225 HP outboards manufactured from 2002 to present. Designed for counter-rotation 76-degree V6... MSRP: Was: Now: $677.05 Add to Cart
SEI New SEI / Yamaha V6 200–225 HP 4-Stroke Gear Set (2002–Present) – Standard Rotation – 2:1 Ratio – Replaces OEM 69J-45551-00-00 This SEI Marine Complete Gear Set is a direct aftermarket replacement for Yamaha V6 4-Stroke 200–225 HP outboards manufactured from 2002 to present. Designed for standard-rotation lower units,... MSRP: Was: Now: $648.07 Add to Cart
SEI New SEI / Yamaha V6 225–250 HP 3.1L / 3.2L 2-Stroke Gear Set (1990–Present) – Standard Rotation – 1.81:1 Ratio – Replaces OEM 61A-45551-03-00 This SEI Marine Complete Gear Set is a direct aftermarket replacement for Yamaha V6 3.1L / 3.2L 2-Stroke outboards rated 225–250 HP from 1990 to present. Designed for standard-rotation... MSRP: Was: Now: $601.11 Add to Cart
SEI New SEI / Yamaha 150 HP 4-Stroke Gear Set (2004–Present) – Counter Rotation – 2:1 Ratio – Replaces OEM 63P-45551-00-00 This SEI Marine Complete Gear Set is a direct aftermarket replacement for Yamaha 150 HP 4-Stroke outboards manufactured from 2004 to present. Designed for counter-rotation lower units, this... MSRP: Was: Now: $774.40 Add to Cart
SEI New SEI / Yamaha V6 150–200 HP 2.6L 2-Stroke Gear Set (1992–Present) – Counter Rotation – 1.86:1 Ratio – Replaces OEM 6G5-45551-10-00 This SEI Marine Complete Gear Set is a direct aftermarket replacement for Yamaha 2.6-liter V6 outboards rated 150–200 HP from 1992 to present. Designed for counter-rotation 90-degree V6... MSRP: Was: Now: $579.88 Add to Cart
SEI New SEI / Yamaha V6 150 HP 2-Stroke 2:1 Gear Set (1987–Present) – Standard Rotation – Complete Gear Set This SEI Marine Complete Gear Set is a direct replacement for Yamaha V6 150 HP 2-Stroke outboards manufactured from 1987 to present. Designed for standard-rotation 90-degree V6 2.6 liter engines, it... MSRP: Was: Now: $492.17 Add to Cart
SEI New SEI / Yamaha V6 150–225 HP 2-Stroke 1.86:1 Gear Set (1991–Present) – Standard Rotation – Complete Gear Set This SEI Marine Complete Gear Set is a direct replacement for Yamaha V6 150-225 HP 2-Stroke outboards manufactured from 1991 to present. Designed for standard rotation 90-degree V6 engines, it... MSRP: Was: Now: $453.87 Add to Cart
SEI New SEI / Yamaha V4 115–130 HP 2-Stroke 2:1 Gear Set (1984–Current) – Standard Rotation – Complete Gear Set Upgrade your Yamaha outboard with this brand-new SEI Marine Complete Gear Set, designed for Yamaha V4 115 HP and 130 HP 2-Stroke engines from 1984 to current models. This 2:1 ratio, 13/26 tooth... MSRP: Was: Now: $426.69 Add to Cart
SEI New SEI / Mercruiser Alpha 1 Gen II 4-CYL/V6/V8 Complete Sterndrive Assembly (1991-2003) Upgrade your boat’s performance with this brand-new SEI / Mercruiser Alpha One Gen II Complete Sterndrive Assembly, designed to replace most MerCruiser sterndrives manufactured between 1991 and... MSRP: Was: Now: $1,935.00 Choose Options
SEI New SEI / Yamaha V6 3.1/3.3L 76° Standard-Rotation Gearcase (1990-2009) This listing is for a New Aftermarket Yamaha V6 3.1/3.2L 76° Standard Rotation Lower Unit. This unit includes a water pump and driveshaft. Please confirm the driveshaft length you need when... MSRP: Was: Now: $1,195.00 Choose Options
SEI New SEI / Mercruiser 1972-1990 4-CYL/V6/V8 R/MR/ & Alpha 1 Complete Sterndrive Assembly Replaces most Mercruiser Sterndrives 228 HP and up from 1974-1990. 3 Year fault free warranty carried by manufacturer (click HERE for details). Comes with a 9-9/16 new style input yoke. If your... MSRP: Was: Now: $1,935.00 Choose Options
SEI New SEI / Mercruiser 1972-1982 4-CYL/V6/V8 R/MR/ & Alpha 1 (Short Yoke) Complete Sterndrive Assembly New SEI Mercruiser Alpha 1 Gen 1 (1967-1982) Complete Standard Rotation (Short Yoke) Sterndrive. Ships in two boxes. Comes with a 8-1/8 old style input yoke. Does not include Complete Install Kit or... MSRP: Was: Now: $1,935.00 Choose Options
SEI Mercury & Mariner 3.0 L V6 S/N 0G960500 & UP 20" (L) Double Upper Bearing Driveshaft OEM # 45-881938 This listing is for a Mercury & Mariner 3.0 L V6 S/N 0G960500 & UP 20" (L) Double Upper Bearing Driveshaft OEM # 45-881938. NOTE: All items for a rebuild are available for order, though they... MSRP: Was: Now: $187.22 Choose Options
SEI New SEI / Mercruiser Bravo I Propshaft OEM # 41630T This listing is for a New SEI / Mercruiser Bravo I Propshaft OEM # 41630T. NOTE: All items for a rebuild are available for order, though they are not necessarily listed on this website. If you need... MSRP: Was: Now: $402.53 Choose Options
SEI New SEI / OMC Sterndrive 6/8 Cylinder Stringer/800 Series Seal Kit OEM # 982946 This listing is for a New SEI / OMC Sterndrive 6/8 Cylinder Stringer/800 Series Seal Kit. This item will replace OEM No. 982946. NOTE: Other rebuild items are available for order, though they are not... MSRP: Was: Now: $47.00 Choose Options
SEI New SEI / Mercruiser Bravo I, II & III Sterndrive Bellows Repair Kit OEM # 30-803100T1 New SEI Mercruiser Bravo I, II and III Bellows Repair Kit. Replaces OEM number 30-803100T1. SHIPPING: Additional shipping fees to Alaska, Hawaii, US Territories, or International Shipping will be... MSRP: Was: Now: $120.00 Choose Options
SEI New SEI / Mercruiser 1992-Up Alpha 1 Gen II Bellows Repair Kit OEM # 30-803099T1 This listing is for a New SEI Mercruiser 1992-Present Alpha 1 Gen II Transom Bellows Repair Kit. Replaces OEM number 30-803099T1. This has a greaseable bearing. If your transom does not have a way to... MSRP: Was: Now: $120.00 Choose Options
SEI New SEI / Mercruiser 1972-1991 Alpha 1 Transom Bellows Repair Kit This listing is for a New SEI Mercruiser 1972-1991 Alpha 1 Gen 1 Transom Bellows Repair Kit with Ridge. Replaces OEM number 30-803097T1. Will fit R, MR and Alpha 1 with exhaust bellows. SHIPPING:... MSRP: Was: Now: $120.00 Choose Options
SEI New SEI / Mercury & Mariner 3.0 L V6 S/N 0G960500 & UP 25" (XL) Double Upper Bearing Driveshaft OEM # 881942 This listing is for a New SEI / Mercury & Mariner 3.0 L V6 S/N 0G960500 & UP 25" (XL) Double Upper Bearing Driveshaft Replaces OEM # 881942. NOTE: All items for a rebuild are available for... MSRP: Was: Now: $180.39 Choose Options
SEI New SEI / Mercruiser 1984-1990 Alpha 1 4-CYL/V6/V8 Complete Counter-Rotation Sterndrive Assembly New SEI Mercruiser Alpha 1 Gen 1 (1984-1990) Complete Counter Rotation Sterndrive. Ships in two boxes. Comes with a 9-9/16 new style input yoke. Does not include Complete Install Kit or Anode Kit... MSRP: Was: Now: $2,165.00 Choose Options
SEI New SEI / Mercruiser 1984-1990 Alpha 1 4-CYL/V6/V8 Complete Counter-Rotation (Short Yoke) Sterndrive Assembly New SEI Mercruiser Alpha 1 Gen 1 (1984-1990) Complete Counter Rotation (Short Yoke) Sterndrive. Ships in two boxes. Comes with a 8-1/8 input yoke. Does not include Complete Install Kit or Anode Kit... MSRP: Was: Now: $2,165.00 Choose Options
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