Sierra Carburetor Kit 18-7097, Replaces MerCruiser 1389-8490A2, Fits M2/Mercarb 2-Barrel Bottom Fill Carburetors

The Sierra Carburetor Kit 18-7097 is a rebuild kit for MerCruiser M2/Mercarb two-barrel carburetors that use the older bottom fill accelerator pump cavity design. It is built to restore a worn or leaking Mercarb carburetor to proper working order, replacing the internal wear components that typically fail with age and ethanol-blended fuel exposure. This kit is matched to MerCruiser carburetors within the model and serial number range 6229718-C856558, and services carburetors carrying Mercruiser Carb numbers 1389-8490A2 and 1389-9350A2. A matching float, Sierra 18-7202, is available as a companion part for these same applications, since the float is sold separately from the carburetor kit itself.

Because this kit is specifically designed for the older MerCarb 2-barrel carburetor with the bottom fill accelerator pump cavity, it will not correctly service later Mercarb carburetors that use a different accelerator pump cavity design, so confirming the accelerator pump cavity style before ordering is important. Components in the kit are precision made for a proper fit against the original carburetor bore and passages, helping restore consistent fuel metering and a reliable idle and throttle response after installation.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7097
• Product Type: Carburetor Kit
• Fits Carburetor Model: M2/Mercarb
• Mercruiser Carb Numbers Serviced: 1389-8490A2, 1389-9350A2
• Model and Serial Number Range: 6229718-C856558
• Companion Float Part Number: 18-7202
• Accelerator Pump Cavity Design: Older MerCarb 2-barrel, bottom fill
• OEM Cross-Reference: 3302-9437, MERCURY MARINE 3302-804845
• Weight: 0.26 pounds
• Product Dimensions: 7.2 x 6.4 x 2 inches
• Exterior/Finish: Machined
• UPC: 030999321183

Fitment

• MerCruiser M2/Mercarb carburetors, model and serial number range 6229718-C856558
• Older MerCarb 2-barrel carburetors with the bottom fill accelerator pump cavity, used on MerCruiser MCM 120, 140, 470, 185, 200 and 898 engines, 1983-86

Replaces (OEM)

• 1389-8490A2
• 1389-9350A2

Frequently Asked Questions

What does the Sierra 18-7097 carburetor kit fit? The 18-7097 kit is designed for MerCruiser M2/Mercarb two-barrel carburetors within model and serial number range 6229718-C856558, including those used on MerCruiser MCM 120, 140, 470, 185, 200 and 898 engines from 1983-86.

Does this kit work on any Mercarb carburetor? No. The 18-7097 kit is specifically built for the older MerCarb 2-barrel carburetor that has the bottom fill accelerator pump cavity, not later Mercarb designs with a different accelerator pump cavity.

What OEM Mercruiser carburetor numbers does 18-7097 service? This kit services carburetors identified by Mercruiser Carb numbers 1389-8490A2 and 1389-9350A2.

Is there an OEM cross-reference for this Sierra kit? Yes, the Sierra 18-7097 carburetor kit cross-references to OEM part numbers 3302-9437 and Mercury Marine 3302-804845.

Does the kit include the float? No, the float is a separate part. The matching float for applications that use the 18-7097 carburetor kit is Sierra 18-7202.

How much does the 18-7097 carburetor kit weigh? The Sierra 18-7097 carburetor kit weighs 0.26 pounds.

What are the dimensions of the carburetor kit packaging? The 18-7097 carburetor kit measures 7.2 x 6.4 x 2 inches.

How do I know if my carburetor has the bottom fill accelerator pump cavity? The 18-7097 kit is matched to older MerCarb 2-barrel carburetors with a bottom fill accelerator pump cavity; carburetors within model and serial number range 6229718-C856558 use this configuration.

What finish do the components in this kit have? The components in the Sierra 18-7097 carburetor kit have a machined exterior finish.

Will this kit fit a MerCruiser MCM 140 engine? Yes, the 18-7097 carburetor kit fits the older MerCarb 2-barrel carburetor used on the MerCruiser MCM 140 (among the MCM 120, 470, 185, 200 and 898 engines) from 1983-86.

Is 18-7097 a genuine Sierra part number? Yes, 18-7097 is the Sierra manufacturer part number for this carburetor kit, sold under the UPC 030999321183.