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Sei Lower Units | Claussmarine.com

Claussmarine.com is the official site for SEI lower units. We offer a variety of products and services, including SEI lower units, to help you get the most out of your boat. Check out our site for more details.


sei lower units


The best aspect approximately SEI is they do now no longer promote a counter rotating decrease unit. So in case you want a left rotation decrease for an outboard you're out of luck. And on a dual setup it constantly appears to be the counter that is going first.

Aside from that I actually have heard exact things.

SEI SE106 Alpha One Gen 1 Lower Unit Standard Rotation (All Ratios)


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If you boat lengthy enough, you may in the end tag bottom, specially in case you stay withinside the Florida Keys. Earlier this 12 months, we determined to move wakeboarding on our 23-foot Dusky middle console, powered with the aid of using a 2003 Yamaha HPDI 200. The vicinity we constantly use for snowboarding within reason shallow, however the intensity could be very consistent … or so we thought. Bam! Bam! Bam! Damn! And much like that, our snowboarding ride changed into done — much like the chrome steel prop, which changed into lacking maximum of a blade.

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When we changed the prop, we ought to see it had a few wobble from a dishonest propshaft. We checked round and determined that changing handiest the shaft might be near to $1,000 with labor, however different additives may also be damaged. We checked out remanufactured decrease units, however they cost $2,240. While our Yamaha runs great, that’s loads of cash to spend on a 10-12 months-antique engine, in view that an excellent used one expenses approximately $5,000. 

yamaha complete lower units


Then a chum of ours instructed us approximately SEI, a enterprise in Oldsmar, Fla., that sells outboard and sterndrive decrease units. When we observed that a brand new alternative from SEI expenses $845 and is derived with a three-12 months warranty — and we ought to set up it ourselves with none unique tools — the selection have become a no-brainer. Another benefit of doing this your self is that you may be mastering the equal system for converting your water-pump impeller (enclosed withinside the white plastic housing on the brand new unit).

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Within multiple days, our SE421 decrease unit arrived, and we went to paintings. Fortunately, SEI has a step-with the aid of using-step preparation manual on its website (sterndrive.cc, withinside the Technical Guides section), so that is a mission that’s very plausible with the aid of using each person with first rate mechanical skills.

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Before beginning paintings at the outdrive, shift the throttle lever into ahead and dispose of the prop. Next, appearance at the pinnacle rear of the outdrive; dispose of the plastic get entry to panel and use a 12 mm socket wrench to dispose of the bolt (picturegraph 1) that holds the trim tab, that is used to reduce prop torque. After the trim tab is off, use a 14 mm socket to dispose of the bolt underneath (picturegraph 2). Just in the front of in which the tab changed into set up is some other bolt which you dispose of with the equal 14 mm socket.

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