A carburetor rebuild is one of the best ways to restore crisp throttle response, cleaner idle quality, and dependable fuel control on a legacy Mercury / Mariner V6 two-stroke. This WMH Carburetor Rebuild Kit is designed for the WMH-series carburetors found on many 1991–1993 Mercury / Mariner 2.5 Liter engines—including AA, BB, CC, EE, F, and NN blocks—as well as select 3.0 Liter applications.
The kit includes the needle and seat plus the core gaskets and service parts typically needed during a standard carb refresh.
What this kit is for
On older WMH carburetors, stale fuel, ethanol residue, storage, and normal wear can harden gaskets, affect the needle and seat, and upset fuel metering. A correct rebuild kit helps restore sealing and serviceability without mixing random pieces from generic kits. This kit is intended for WMH carburetors specifically, which matters because Mercury used several V6 carb families over the years.
WMH carburetors covered by this kit
This rebuild kit fits WMH 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 pumper carbs, plus WMH 12, 13, 14, 15, 16, 21, and 27 non-pumpers. That covers many of the carbureted Mercury / Mariner 135 HP, 150 HP, 175 HP, 200 HP, 225 HP, and 245 HP V6 applications still being rebuilt and run today.
Important note for pumper carb owners
This is the core rebuild kit for the pumper WMH carb bodies, meaning it covers the standard internal service items such as the needle and seat and gaskets. However, the separate pumper-specific rebuild pieces are not included, and those pumper parts are no longer available. If you are rebuilding a pumper carb, this kit still handles the core service items, but it does not include the discontinued pumper hardware.
Common engine families and model coverage
For the way owners actually search, this WMH rebuild kit is commonly associated with Mercury and Mariner 2.5L V6 carbureted outboards in the 135, 150, 175, 200, 225, and 245 HP range, along with select 3.0L carbureted applications. Buckshot Racing #77’s carburetor identification guide also places WMH carburetors across legacy 2.0L, 2.4L, 2.5L, and 3.0 Liter Mercury V6 two-stroke families from 1976 through 2005.
Because Mercury carburetor swaps are common, the safest way to confirm fitment is to match the carb number and the rebuild-kit part number, not just the horsepower on the cowl.
Part numbers and cross-references
This WMH carburetor rebuild kit is commonly referenced by these Mercury and aftermarket numbers: Mercury / Quicksilver: 810749, 8107491, 8107492, Sierra: 18-7213, GLM: 40620, Mallory: 9-37305
Mercury parts sources also show 8107491 superseded by 8107492, which is helpful when matching older paperwork, carb kit labels, or service notes.
Why float height + passage cleaning matter
A rebuild kit only works as well as the rebuild itself. On a WMH carburetor, setting float height correctly is critical because fuel level directly affects idle quality, throttle response, and mixture consistency. Even a new needle and seat will not perform correctly if the float level is off.
It is just as important to clean every small passageway thoroughly during the rebuild. Varnish, residue, and debris in idle circuits, transfer passages, and small drilled passages can cause poor idle, bogging, uneven fuel delivery, and hard starting even after new parts are installed. Buckshot Racing #77’s carb rebuild guides specifically recommend soaking metal parts, cleaning passages, and using compressed air during the process.
Helpful guides on setting float height and proper WMH rebuild procedure can be found in the Buckshot Racing #77 Tech Hub (blog) and the WMH/WMV Jet & Rebuild Manual offered on the site.
Why the needle and seat matter
The needle and seat control fuel entry into the bowl. If they are worn, dirty, or varnished, the carburetor can flood, leak, or meter fuel inconsistently. That can show up as hard starting, poor idle, rich running, or fuel dripping after shutdown. Including the needle and seat in the kit is important because it addresses one of the most common wear points in an older WMH carburetor.
Helpful rebuild note
A rebuild kit restores seals and core service parts, but it does not fix a carb body that is warped, corroded, or physically damaged. Clean every passage thoroughly, inspect the float and bowl condition, confirm the exact WMH number, and set the float height correctly before reassembly.
On a Mercury V6 with three carbs, it is also smart to rebuild all three together so fuel delivery stays consistent bank to bank. Buckshot Racing #77’s Tech Hub and manual downloads are useful resources if you want step-by-step reference while doing the job.
Ordering note
Includes one (1) WMV Carburetor Rebuild Kit. Three (3) are required to rebuild all 3 carbs. Select your quantity at check-out. We also include the exploded diagram with each rebuild kit (from the Mercury Service Manual) as a reference for you.
Final take
If you are servicing a Mercury / Mariner V6 WMH carburetor, this kit is the correct rebuild family for many 2.5L and select 3.0L carbureted two-stroke outboards. It fits WMH 1–11 pumpers and WMH 12, 13, 14, 15, 16, 21, and 27 non-pumpers, and it is commonly identified by 810749, 8107491, 8107492, 18-7213, 40620, and 9-37305. Matching the carb number first—and then taking the time to set float height correctly, clean every small passage, and rest idle screws—is the best way to get a successful rebuild.
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Feel free to contact Mike Hill at +1-714-697-1716 or mike@buckshotracing77.com for racer-level experience and the best technical support.