Sierra 18-7738 Carburetor Kit, Replaces Mercury Marine 802706A1, Fits 9.9 HP and 15 HP 4-Stroke Outboards

The Sierra 18-7738 Carburetor Kit is a replacement carburetor rebuild kit engineered for Mercury outboard 4-stroke engines. It is built to replace Mercury Marine OEM part 802706A1, giving owners a direct, kit-for-kit way to restore original carburetor function without sourcing a full OEM assembly. The kit is intended for Mercury 9.9 HP 4-Stroke (323cc) outboards from 1999 and up, as well as Mercury 15 HP 4-Stroke outboards from 1998 and up, making it the correct rebuild solution for these two specific powerhead applications.

Carburetor kits like the 18-7738 are used when an outboard is running rough, flooding, hard to start, or showing signs of stale-fuel varnish buildup inside the carburetor bowl and jets. Rebuilding with a dedicated kit restores factory-calibrated fuel metering rather than replacing the entire carburetor body, which keeps the repair focused and the original carburetor housing in service. The kit carries a machined exterior finish consistent with OEM-style carburetor hardware and is packaged as a complete, ready-to-install unit count of one.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7738
• Product Type: Carburetor Kit
• Category: Mercury Outboard Carburetors and Kits
• Replaces (OEM): Mercury Marine 802706A1
• Fitment: Mercury 9.9 HP 4-Stroke (323cc), 1999 and up; Mercury 15 HP 4-Stroke, 1998 and up
• Weight: 0.01 pounds
• Package Dimensions: 11.684 cm L x 11.43 cm W x 5.588 cm H
• Country of Origin: China
• Exterior Finish: Machined
• Unit Count: 1

Fitment

• Mercury 9.9 HP 4-Stroke (323cc), 1999 and up
• Mercury 15 HP 4-Stroke, 1998 and up

Replaces (OEM)

• Mercury Marine 802706A1

Frequently Asked Questions

What does the Sierra 18-7738 carburetor kit replace? The Sierra 18-7738 carburetor kit is a direct replacement for Mercury Marine OEM part 802706A1.

Which Mercury outboards is the 18-7738 kit designed for? This kit fits Mercury 9.9 HP 4-Stroke (323cc) outboards from 1999 and up, and Mercury 15 HP 4-Stroke outboards from 1998 and up.

Will the 18-7738 kit work on a 1997 Mercury 9.9 HP outboard? No. The Sierra 18-7738 carburetor kit is specified for the 9.9 HP 4-Stroke (323cc) engine starting in 1999, so earlier model years are not covered by this listing.

How much does the 18-7738 carburetor kit weigh? The Sierra 18-7738 carburetor kit weighs 0.01 pounds.

Is the 18-7738 an OEM Mercury part or an aftermarket kit? It is a Sierra-brand aftermarket carburetor kit manufactured to replace Mercury Marine OEM part 802706A1.

What is included in the Sierra 18-7738 kit? The kit ships as a single complete carburetor rebuild kit (unit count of one) under Sierra part number 18-7738.

Does the 18-7738 kit fit a Mercury 15 HP 2-stroke motor? No, the Sierra 18-7738 carburetor kit is fitted to the Mercury 15 HP 4-Stroke outboard from 1998 and up, not 2-stroke models.

What finish does the carburetor hardware have? The components in the 18-7738 kit have a machined exterior finish.

Where is the Sierra 18-7738 carburetor kit manufactured? The country of origin for the Sierra 18-7738 kit is China.

Can this kit be used to rebuild a carburetor showing flooding or hard-starting symptoms? Yes, carburetor kits such as the Sierra 18-7738 are used to rebuild carburetors on Mercury 9.9 HP and 15 HP 4-Stroke outboards experiencing flooding, rough idle, or hard starting due to worn or gummed internal components.

What are the package dimensions of the 18-7738 kit? The Sierra 18-7738 carburetor kit ships in packaging measuring 11.684 cm long by 11.43 cm wide by 5.588 cm high.

Is the Sierra 18-7738 kit a full carburetor replacement or a rebuild kit? It is a rebuild kit, meaning it supplies the internal components needed to service the existing carburetor body rather than replacing the whole carburetor assembly.