Sierra 18-7021 Carburettor Gasket Kit Mercury Mariner WMK WMD
18-7021
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Sierra 18-7021 Carburettor Kit
For selected Mercury WMK and WMD carburettors
The Sierra 18-7021 kit supplies replacement gaskets for servicing selected Mercury and Mariner WMK and WMD carburettors. Correct carburettor identification is essential because the listed engine families span multiple years and power ratings.
Key Features
- ✔ Genuine Sierra-branded aftermarket gasket kit
- ✔ For selected WMK and WMD carburettors
- ✔ Covers a wide range of classic Mercury/Mariner models
- ✔ Intended for carburettor strip-down and reassembly
- ✔ One service kit supplied
Technical Specs
| Brand | Sierra |
| Part number | 18-7021 |
| Part type | Carburettor gasket kit |
| Carburettor families | WMK / WMD |
| Application | Mercury / Mariner outboards |
| Quantity | 1 kit |
Compatibility / Fitment Guide
Applications include selected 4.5HP WMD-1; 35HP WMK-38; 40HP WMK-1/-8/-21/-24/-31; 50HP WMK-8; 65HP WMK-5/-12/-13/-20; 80HP WMK-2; 85HP WMK-4/-16/-17; and selected 90–150HP six-cylinder WMK carburettors. Match the exact carburettor number before purchase.
Part Number Cross Reference
| Sierra | 18-7021 |
| Carburettor families | Mercury / Mariner WMK and WMD series |
The long application list is a guide only. The stamped carburettor model is the controlling fitment reference.
Questions & Answers
Is this genuine Mercury?
No. It is a genuine Sierra aftermarket gasket kit.
Will it fit every WMK carburettor?
No. Confirm the precise WMK model against the application list and parts catalogue.
Does it include carburettor jets?
No jets should be assumed; this listing is for a gasket kit.
How many kits are needed?
Generally one per carburettor serviced; multi-carb engines may require multiple kits.
Note: Clean all sealing faces without damaging them and set the carburettor according to the engine workshop manual.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
