Sierra 18-7743 Carburetor Kit, Replaces Mercury 804346T1, for 75 HP and 90 HP 4-Stroke Outboards (2000 & Up)

The Sierra 18-7743 Carburetor Kit is a complete rebuild kit for the carburetor on select Mercury 75 HP and 90 HP 4-Stroke outboard engines (2000 & Up). It restores factory fuel-metering performance to a worn or leaking carburetor by replacing every wear-prone internal component in a single kit, rather than sourcing gaskets, seals, and small hardware individually.

The kit includes a needle and seat assembly, a fuel filter for the carburetor inlet, eleven O-rings, four screws with washers, a float chamber gasket, a float, a clip, a float arm pin, and a seal, giving a technician everything needed to fully rebuild the carburetor in one service. This kit directly replaces Mercury Marine part number 804346T1 and is built to meet or exceed the performance of the original equipment part it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7743
• Replaces (OEM): 804346T1
• Fits: Mercury 75 4-Stroke (2000 & Up), Mercury 90 4-Stroke (2000 & Up)
• Weight: 0.15 pounds
• Unit Count: 1
• UPC: 808282167677
• Included Components: Needle & Seat Assembly, Fuel Filter (Carb Inlet), 11 O-Rings, 4 Screws with Washer, Float Chamber Gasket, Float, Clip, Float Arm Pin, Seal

Fitment

• Mercury 75 4-Stroke (2000 & Up)
• Mercury 90 4-Stroke (2000 & Up)

Replaces (OEM)

• 804346T1

Frequently Asked Questions

What engines does the Sierra 18-7743 carburetor kit fit? The Sierra 18-7743 carburetor kit fits Mercury 75 HP 4-Stroke and 90 HP 4-Stroke outboard engines built in 2000 and later.

What OEM part number does the 18-7743 kit replace? It replaces Mercury Marine part number 804346T1.

What is included in the Sierra 18-7743 kit? One needle and seat assembly, one fuel filter for the carburetor inlet, eleven O-rings, four screws with washers, one float chamber gasket, one float, one clip, one float arm pin, and one seal are included.

Is this a full carburetor or a rebuild kit? The 18-7743 is a rebuild kit, not a complete carburetor. It supplies the internal wear parts needed to rebuild an existing carburetor rather than replacing the whole unit.

How many O-rings come in the kit? The kit includes eleven O-rings, along with the other gaskets and seals needed for a full carburetor rebuild.

How much does the 18-7743 carburetor kit weigh? It weighs 0.15 pounds.

Is the Sierra 18-7743 kit equivalent to the genuine Mercury part? Yes, Sierra states this kit meets or exceeds the original equipment part it replaces, Mercury Marine 804346T1.

Does the kit include a fuel filter? Yes, a fuel filter for the carburetor inlet is included in the 18-7743 kit.

Will the 18-7743 kit work on a Mercury 75 HP built before 2000? The kit is specified for Mercury 75 HP and 90 HP 4-Stroke engines from model year 2000 and later; earlier model years are not covered by this part number.

What brand makes part number 18-7743? Sierra manufactures the 18-7743 carburetor kit.