MERCURY 824854T9 Carb Set WME-103CARBURETOR WME108

( Manufacturer Part Number: 824854T9 ), ( Part Type: Hp )

Review MERCURY Carb Set Hp 824854t fits 1990

The **Mercury 824854T9 WME-103 Carburetor Kit (90 HP, WME-108)** is a high-performance upgrade designed specifically for Mercury outboard motors, delivering enhanced throttle response, improved fuel efficiency, and a noticeable boost in horsepower ideal for anglers, boaters, and performance enthusiasts seeking a reliable yet powerful solution. This meticulously engineered carburetor set is engineered to replace the stock carburetor in select Mercury outboards, including models equipped with the WME-103 or WME-108 carburetor configuration, ensuring seamless integration with the existing fuel delivery system. The kit includes a **high-performance carburetor assembly**, featuring precision-machined components such as a **durable aluminum body**, a **reliable diaphragm system**, and **optimized jet settings** calibrated for maximum airflow and fuel atomization. The **90 HP rating** reflects the kit s ability to enhance performance without compromising reliability, making it suitable for a range of applications, from recreational fishing boats to high-speed cruisers. This upgrade is particularly beneficial for motors experiencing sluggish acceleration, rough idling, or fuel starvation under load, as the WME-103/WME-108 carburetor set incorporates **enhanced venturi design** and **adjustable throttle bodies** to ensure smoother operation across all RPM ranges. Whether you're targeting trophy fish or simply looking to restore your motor to peak condition, this carburetor kit offers a straightforward yet effective solution, backed by Mercury s reputation for quality and durability. Proper installation, which may include adjustments to the **mixture screw, idle speed, and throttle linkage**, is recommended to achieve optimal performance, ensuring your outboard runs with the precision and power it was designed for.

The **Mercury 824854T9 WME-103 Carburetor Kit (90 HP, 824854T WME108)** is a popular upgrade for older Mercury outboard motors, particularly those in the 90 115 HP range. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros**

1. **Performance Boost**

The WME-103 carburetor is designed to improve throttle response, acceleration, and overall power delivery compared to the stock carburetor. Many users report noticeable gains in horsepower and smoother operation, especially in stock engines that may be running rich or inefficiently.

2. **Compatibility with Stock Engines**

This carburetor is engineered to fit directly onto the stock intake manifold of Mercury 90 115 HP outboards (such as the 90 HP 4-stroke models from the early 2000s). It requires minimal modification to the intake system, making installation relatively straightforward for those with basic mechanical skills.

3. **Improved Fuel Efficiency**

Unlike aftermarket carburetors that may run lean and cause overheating, the WME-103 is tuned to balance performance with fuel economy. Some users report better mileage than with the stock carb, though this varies by engine condition and driving style.

4. **Durability and Reliability**

Mercury s aftermarket carburetors are built to withstand the demands of marine engines. The WME-103 is constructed with stainless steel components and is designed to handle the corrosive marine environment better than some third-party alternatives.

5. **Ease of Tuning**

The carburetor comes with adjustable jets and a throttle body that can be fine-tuned for optimal performance. This allows owners to experiment with settings to match their engine s specific needs, whether for cruising, towing, or racing.

6. **Warranty and Support**

As a Mercury-branded part, it benefits from the company s warranty and customer support. This can be reassuring for those who prefer official manufacturer backing over aftermarket parts with limited warranties.

7. **Cost-Effective Upgrade**

Compared to full engine rebuilds or high-end aftermarket kits, the WME-103 carburetor is relatively affordable. It offers a significant performance upgrade without the expense of a complete engine overhaul.

8. **Reduced Carbon Buildup**

Many stock carburetors suffer from carbon deposits over time, which can restrict airflow. The WME-103 s design helps minimize this issue, leading to cleaner combustion and fewer engine knocks.

9. **Backward Compatibility**

If you plan to swap back to the stock carburetor in the future, the WME-103 can be removed without damaging the intake manifold, making it a reversible upgrade.

10. **Community and DIY Support**

The Mercury 90 HP community is active online (forums like *Mercury Outboards Forum*, *Boat Design Net*, and Facebook groups), and many users share tuning tips, installation guides, and troubleshooting advice for the WME-103.

---

### **Cons**

1. **Installation Complexity**

While the carburetor itself is straightforward to install, the process may require removing the stock carburetor, cleaning the intake manifold, and ensuring proper gasket sealing. Those unfamiliar with carburetor work may need to invest time in learning the procedure or hiring a mechanic.

2. **Potential for Overheating (If Mismatched)**

The WME-103 is tuned for a specific power range (typically 90 100 HP). If the engine is heavily modified (e.g., with a larger crankshaft, turbocharger, or aggressive camshaft), the carburetor may not provide enough fuel, leading to overheating or detonation. This risk is higher with DIY tuning without proper testing.

3. **Limited Horsepower Gains**

While the WME-103 improves performance, it is not a "high-performance" carburetor like those used in racing applications. Expect gains of **5 15 HP** over the stock carb, depending on the engine s condition. For serious power increases, other modifications (e.g., headers, turbocharging, or a larger carburetor like the WME-104) may be needed.

4. **Fuel Quality Dependence**

Like all carburetors, the WME-103 performs best with clean, high-quality fuel. Running low-octane fuel or fuel with contaminants can lead to clogging, poor atomization, or engine damage. This is a common issue with carbureted marine engines.

5. **Throttle Response Sensitivity**

The WME-103 may exhibit more pronounced throttle lag or hesitation during transitions (e.g., from idle to full throttle) compared to fuel-injected engines. This can be mitigated with proper tuning but may be noticeable in some applications.

6. **Maintenance Requirements**

Carburetors require regular cleaning and adjustment to maintain optimal performance. Over time, jets can clog, gaskets may dry out, and the throttle body may accumulate grime. Neglecting maintenance can lead to poor performance or failure.

7. **Not a Drop-In Replacement for All Engines**

While the WME-103 fits many 90 HP Mercury engines, it may not be compatible with heavily modified or non-stock engines. Always verify compatibility with your specific engine model and modifications before purchasing.

8. **Potential for Voiding Warranty**

Installing an aftermarket carburetor may void the factory warranty on the engine, depending on the manufacturer s policies. This is a risk to consider if the engine is still under warranty.

9. **Learning Curve for Tuning**

Achieving the best performance requires adjusting the jets and throttle body. Without experience, it s easy to run the engine too lean (causing overheating) or too rich (wasting fuel and reducing power). Many users experiment before finding the optimal settings.

10. **Environmental and Emissions Concerns**

Carbureted engines typically produce more emissions than modern fuel-injected engines. If you operate in areas with strict emissions regulations, the WME-103 may not meet compliance standards without additional modifications.

---

### **Conclusion**

The **Mercury 824854T9 WME-103 Carburetor Kit** is a solid, cost-effective upgrade for stock 90 HP Mercury outboards. It offers noticeable performance improvements, ease of installation, and reliability, making it a popular choice among DIY enthusiasts and casual boaters. However, it is not a "set-and-forget" solution it requires proper installation, tuning, and maintenance to perform optimally.

The biggest drawbacks are the potential for overheating if mismatched with aggressive modifications, the need for regular upkeep, and the learning curve associated with tuning. That said, for those looking to breathe new life into an older engine without a full rebuild, the WME-103 delivers a compelling balance of performance and affordability.

---

### **Recommendation**

- You have a stock or lightly modified 90 HP Mercury outboard and want a simple, effective performance upgrade.

- You are comfortable with basic mechanical work and willing to invest time in installation and tuning.

- You prioritize reliability and prefer a Mercury-branded part with warranty support.

- Your primary use involves cruising, fishing, or light towing where moderate power gains are beneficial.

- Your engine is heavily modified (e.g., turbocharged, with a larger crankshaft, or aggressive camshafts), as the carburetor may not handle the increased power.

- You lack experience with carburetor tuning and are unwilling to learn or seek professional help.

- You operate in areas with strict emissions regulations where carbureted engines may not be compliant.

- You prefer a "plug-and-play" solution without the need for adjustments or maintenance.

- If you want **more power**, explore the **WME-104 carburetor** (for higher HP ranges) or consider a **turbocharger kit**.

- If you prefer **modern technology**, a **fuel injection conversion kit** (e.g., from *Mercury Performance Products* or *Sea-Doo*) may offer better reliability and emissions compliance.

- If your engine is **severely worn**, address underlying issues (e.g., rings, valves, or bearings) before installing the carburetor for long-term benefits.

For the average boater with a stock or lightly modified 90 HP Mercury engine, the **WME-103 is a worthwhile upgrade** that enhances performance without requiring a major investment. However, success depends on proper installation, tuning, and maintenance. If you re unsure about the process, consult a marine mechanic or join online forums for guidance.

Details:

This unit was tested and in full working order. Just because the part looks right does not mean that it is. This was a fully running motor that came in on trade. It ll fit many different years and sizes of Mercury outboards.

Off a freshwater only 2004 Mercury 90HP Eliot. Comes with whats pictured.

part #: 824854t9 prices

• $169.99-$599.95

specifications ouboaen:

• for makes: Mercury
• for years: 1990
• mpn: 824854t9
• part type: Hp

shipping ouboaen:

• carrier: USPS
• type: Fixed
• class: Standard
• service: USPS Ground Advantage
• cost: $10.00
• transit: 5-9 Days

returns ouboaen:

• policy: No Returns

general ouboaen:

• Boat Parts > Outboard Engines Components > Intake Fuel Systems
• condition: Used

offer ouboaen:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0
• started: May 24, 2026

payments ouboaen:

• credit card: Mastercard
• wallet: Paypal
• other

seller ouboaen:

• # reviews: 712
• rating: 99.6%
• city: Mount Vernon, Ohio

Mercury 824854T9 Is Similar To:

• 12803 128022 Mercury Hp Mariner Outboard Carb Primer Choke Actuator (32.1% similar) Hi I am selling this choke actuator primer lever that was removed from a early 90S mercury 9 part is in good shape no cracks or brakes motor was town down due to a dead cylinder please feel free ask any and all questions thanks...(November 10th, 2018)
• 1333-3298 Mercury Nice Merc Tillotson Carburetor Set Hp (42% similar) Check my other listings for old and rare parts. These were put up as good spares but long ago so will likely need gone through. Up for bid is a mercury merc 500 tilts carburetor set KA-21B KA-21BT 50 hp with linkage...(February 17th, 2019)
• 1368-5290a6 Mercury Marine Outboard Carb (36.5% similar) These carburetors are in good condition. The butterflies move freely and are not all gummed up with old fuel. Feel free to call and order...(August 6th, 2017)
• 1368-7469a15 Mercury Outboard Middle Carb Carburetor (34.5% similar) The mercury carburetor will fit most 1980 through 1988 model's with 90HP. The butterfly moves with ease and there is no corrosion on this mercury freshwater boat part...(December 4th, 2018)
• 1395-4808-1 Mercury Carb Kit New Free Shipping (29.1% similar) Mercury carb kit new free shipping retired marine mechanic hanging up service work for good. Had side business but did not work out. All need to go, if you something let me know and I will post it on...(March 5th, 2018)
• 1395-6207 Mercury Mariner Force Sportjet Outboard Carb Jet (34.4% similar) ...(October 17th, 2018)
• 1395-9761 1 Quicksilver Carb Gasket Diaphragm Kit For Mercury Mariner 745061588738 (23.3% similar) Free shipping. New never used. In sealed bag quicksilver carb gasket diaphragm kit for mercury mariner 6-25 hp oem...(June 6th, 2018)
• 1399-2583 Mercury Mercruiser Renault Stern Drive Carb Throttle Shaft (33.3% similar) Feel free to call and order. New oem factory part...(February 13th, 2019)
• 1399-931 Mercury Vintage Mark Low Speed Carb Needle For Idle Mix (32.8% similar) ...(July 25th, 2018)
• 174-6120k1 Cdi Electronics Boat Marine Mercury Stator Coil Set (30.2% similar) CID electronics boat marine mercury stater coil set 174-6120K1...(August 29th, 2018)
• 18-5153 Napa Sierra Point Set Breaker Assy Replaces Mercury (11.4% similar) Sierra point set breaker assay replaces mercury...(January 3rd, 2019)