BFO 21DQKS Impeller Kit 90HP 3CYL 2-CYCLE 47-43026T6

( Brand: Bfo ), ( Manufacturer Part Number: 21DQKS ), ( Part Type: Impeller ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Country Of Origin: China ), ( Fitment: For Mercury Mariner 40/45/50/60/70/75/80/90/100/115, For Alpha One Gen Ii, For Mercury Mariner 125/135/150/175/200/225/250/275 Hp )

Review BFO Impeller Kit Mercury 90hp 3cyl 2-cycle fits MARINER 1970–1980

The **BFO 21DQKS Impeller Kit** is a precision-engineered aftermarket upgrade designed specifically for Mercury Marine s iconic 70, 75, 80, and 90 horsepower three-cylinder two-stroke outboard engines, covering model years compatible with part number **47-43026T6**. This high-performance impeller kit is meticulously crafted to enhance the efficiency, power delivery, and longevity of your engine by replacing the stock impeller assembly with a superior, balanced, and durable alternative. Engineered from high-grade, corrosion-resistant materials, the impeller features a carefully optimized blade design that maximizes water flow while minimizing turbulence, ensuring smoother operation and reduced strain on the engine s internal components. The kit includes a precision-machined impeller, a reinforced impeller shaft, and a sealed bearing assembly, all of which work in tandem to improve throttle response, fuel economy, and overall engine performance. Whether you re a weekend angler, a weekend warrior, or a performance enthusiast, this impeller kit is tailored to deliver noticeable improvements in power output and reliability, making it an excellent choice for those seeking to extract every ounce of potential from their Mercury 3-cylinder two-stroke outboard. Backed by BFO s reputation for quality and compatibility, this kit is a straightforward yet impactful upgrade that can help restore or enhance the performance of your engine, ensuring it runs with the efficiency it was originally designed for.

### Pros and Cons of buying a BF0 21DQKS Impeller Kit for Mercury Mariner 3-Cylinder 2-Cycle Outboards (47-43026T6)

1. **Improved Cooling Efficiency** The impeller kit is designed to enhance water flow through the engine, reducing overheating risks, especially in high-performance or heavily loaded conditions. This is particularly beneficial for older or high-hour engines where cooling efficiency may degrade over time.

2. **Extended Engine Life** By maintaining optimal cooling, the impeller kit can help prevent thermal stress, which is a leading cause of engine wear and failure in 2-cycle outboards. This may reduce the likelihood of costly repairs or premature engine replacement.

3. **Better Fuel Efficiency** Improved cooling can lead to more consistent engine performance, which may indirectly contribute to slightly better fuel economy by preventing power loss due to overheating.

4. **Compatibility with Modern Upgrades** If you ve installed other performance-enhancing modifications (e.g., larger props, exhaust systems, or fuel upgrades), the BF0 impeller kit can help compensate for increased cooling demands.

5. **Easy Installation** The kit is designed for straightforward installation, typically requiring only basic tools. Mercury-Mariner parts are generally well-documented, and many boat owners or mechanics can complete the job without professional assistance.

6. **Cost-Effective Maintenance** Compared to major engine overhauls or replacements, the impeller kit represents a relatively low-cost solution for addressing cooling issues. It s a proactive measure that can save money in the long run.

7. **Warranty Coverage** If purchased from an authorized dealer or through Mercury-Mariner s official channels, the impeller kit may come with a warranty, providing peace of mind against defects.

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1. **Limited Performance Gain for Stock Engines** If your engine is running well without issues, upgrading the impeller may not provide noticeable benefits. The gains are most apparent in engines that are already struggling with cooling or have been modified for higher performance.

2. **Potential for Overcooling** In some cases, an oversized impeller can pull too much water through the engine, leading to excessive cooling and condensation in the crankcase. This can cause oil dilution, reduced lubrication, and potential long-term damage if not properly managed (e.g., by using a crankcase breather or synthetic oil).

3. **Compatibility Concerns** While the BF0 kit is designed for the specified 3-cylinder 2-cycle engines (47-43026T6 series), ensure it matches your exact model year and engine variant. Mixing parts from different generations (e.g., older vs. newer 2-cycle engines) could lead to fitment issues or performance problems.

4. **Installation Risks** If not installed correctly, the impeller can be damaged during installation or operation. Improper alignment or seating can cause leaks or reduced efficiency. Always follow the manufacturer s instructions or consult a professional if unsure.

5. **Cost Relative to Engine Age** If your engine is near the end of its service life (e.g., 300 hours or showing signs of wear), investing in an impeller kit may not be the most cost-effective solution. In such cases, a full rebuild or replacement might be more practical.

6. **Environmental Impact** Some impeller kits may require slightly more water flow, which could affect fuel efficiency or cooling in very shallow or warm water conditions. This is usually minor but worth considering for frequent use in marginal environments.

7. **Availability of Alternatives** While the BF0 kit is a reputable choice, other aftermarket impellers (e.g., from brands like Sea Fox or Mercury s own performance line) may offer different flow characteristics. Researching alternatives could yield a better fit for your specific needs.

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The BF0 21DQKS impeller kit is a worthwhile upgrade for Mercury-Mariner 3-cylinder 2-cycle outboards (47-43026T6 series) if you re experiencing cooling-related issues, have modified the engine for higher performance, or want to extend its lifespan. It s particularly valuable for engines operating in demanding conditions (e.g., heavy loads, towing, or frequent high-speed use). However, if your engine is already running smoothly or nearing the end of its serviceable life, the benefits may not justify the cost.

For most users who notice overheating, reduced performance, or excessive oil consumption, the impeller kit is a practical and cost-effective solution. It s a low-risk upgrade with the potential for significant long-term savings by preventing major engine damage.

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- Your engine shows signs of overheating (e.g., temperature gauge fluctuations, white smoke, or reduced power).

- You ve made performance modifications (e.g., larger prop, exhaust system, or fuel upgrades) that increase cooling demands.

- You re looking to extend the engine s life or improve reliability for frequent use.

- Your engine is relatively new or has low hours (under 200-300 hours) and you want to maintain optimal performance.

- Your engine is running fine without cooling issues.

- The engine has high hours (300 hours) or visible wear, as other repairs may be more urgent.

- You re unsure about installation consult a marine mechanic to ensure proper fitment and avoid potential issues like overcooling.

- Pair the impeller upgrade with other maintenance tasks, such as checking the water pump, impeller alignment, and cooling system seals.

- Use high-quality 2-cycle oil (e.g., Mercury Marine s own blend) to mitigate any risk of oil dilution from increased cooling.

- Monitor engine performance after installation. If you notice excessive condensation, white smoke, or oil dilution, address it promptly by adjusting the impeller or using a crankcase breather.

In summary, the BF0 impeller kit is a solid choice for addressing cooling inefficiencies in compatible Mercury-Mariner engines, but it s best suited for engines that already show signs of needing an upgrade. Always prioritize the specific needs of your engine and consider professional advice if in doubt.

Details:

OE/Part number. Type:Outboard Water Pump Impeller Repair Kit. Package included. Factory Warranty.

Material Rubber Stainless Steel Plastic. For Mercury Mariner 40/45/50/60 Four stroke. For Mercury Mariner 60 hp, 2-cycle S/N OD000750 above ; 3cyl. For Alpha I, Gen II S/N 0D469859 above One 2 Drives.

For Mercury Mariner 75, 90, 115 hp Four Stroke 75 - 125 All 3/4 cylinder 0A996142 above. All messages. Best Costumer Service. It same to the picture shown.

Guaranteed Fitment Always the correct part. Suspension Masters US.

part #: 21dqks price

• $30.85

specifications ouboaen:

• for models: Mariner
• for makes: Mercury
• for years: 1970-1980
• brand: Bfo
• mpn: 21dqks
• part type: Impeller
• california prop 65 warning: California Prop 65 Warning
• country of origin: China
• fitment: For Mercury Mariner 40/45/50/60/70/75/80/90/100/115, For Alpha One Gen Ii, For Mercury Mariner 125/135/150/175/200/225/250/275 Hp

payments ouboaen:

• wallet: Google-pay
• credit card: Mastercard
• other

returns ouboaen:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

general ouboaen:

• Boat Parts > Outboard Engines Components > Other
• condition: New

shipping ouboaen:

• class: Standard
• cost: $0.00
• transit: 3-7 Days
• type: Fixed
• service: Standard

seller ouboaen:

• city: Elk Grove Village, Illinois
• rating: 99.6%
• # reviews: 16481

offer ouboaen:

• quantity: 10
• sold: 0
• started: May 6, 2026
• options: Ship-to-home
• availability: In Stock

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