Outboard Carburetor 8M0129551 8M0109534 for Mercury Mariner Engine 15HP 20HP
This carburetor is engineered as a direct replacement for the Mercury Mariner Engine 15HP 20HP. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.
Vehicle Compatibility
| Application | Details |
|---|---|
| Carburetor 8M0129551 8M0109534 853720T16 853720T20 for Mercury Mariner Outboard Engine 15HP 10HP 20HP 4 | Stroke Replace Part Number:8M0129551, 8M0109534, 853720T16, 853720T20, 853720T19, 8M0129554, 8M0109535 Fit for Mercury Mariner Engine: 10HP, 15HP, 20HP See Details:15HP 0R558208 THRU 0R833819 – Cat.# 90-898103160 – Carb 2CYL JCI Carburetor 0R686021 and Up15HP 0R235949 THRU 0R833819 – Cat.# 90-898103160 – Carb 2CYL Carburetor 0R686021 and Up10HP 0R575531 THRU 0R833819 Carburetor 0R686021 and Up20HP 0R235168 THRU 0R833819 – Cat.# 90-898103160 – Carb Carburetor 0R686021 and Up |
Replaces OEM Part Numbers
8M0129551 • 8M0109534 • 853720T16 • 853720T20 • 853720T19 • 8M0129554 • 8M0109535 • Mercury • Mariner • Engine • Details • 0R558208
Signs You Need a Replacement
If your equipment is showing any of these symptoms, the carburetor may be the cause:
- Engine floods easily — The float valve isn’t seating properly, allowing fuel to overflow into the bore. The engine loads up with fuel and won’t start until it clears.
- Lean surging at cruise speed — A blocked main jet or partially clogged passage causes the engine to run lean under steady throttle. It surges as the mixture alternates between lean and rich.
- Black smoke and rich smell — Too much fuel relative to air. Check the choke mechanism, float level, and jet sizes if the carburetor has been modified.
- Fuel dripping from the carburetor — A worn needle and seat or stuck float allows fuel to overflow. This is a fire hazard and should be fixed immediately.
- Hard starting when cold — The choke circuit may be blocked or the enrichment valve stuck. Cold-start problems on a carbureted engine almost always trace back to the choke.
- Inconsistent idle speed — The idle mixture screws may need adjustment, or there’s a vacuum leak at the carburetor base gasket.
Rebuild Tips
Before installing the new carburetor, clean the manifold surface and check the gasket for any damage or vacuum leaks. Set the idle mixture screws to the baseline position (typically 1.5 turns out from fully seated) before starting. After starting, warm the engine to operating temperature, then fine-tune the mixture screws for the highest smooth idle. Adjust the idle speed screw last. If the engine backfires through the carburetor, check the valve adjustment and ignition timing.
Frequently Asked Questions
Can I cross-reference 8M0129551 with 8M0109534?
Yes. Both 8M0129551 and 8M0109534 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.
Should I rebuild or replace the carburetor?
If the throttle shaft has lateral play or the carburetor body is warped, replacement is the better option. A rebuild kit handles gaskets, jets, and needles but can’t fix mechanical wear. For most applications, a new carburetor costs about the same as a professional rebuild when you factor in labor.
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