MERCURY 16731T01 Switch Outboards 40HP 115HP

( Manufacturer Part Number: 16731T01 ), ( Part Type: Switch ), ( Warranty: 30 Day Warranty ), ( Country Of Origin: United States ), ( Compatible Part Numbers: 16731a 1, 58124a28 )

Review MERCURY Switch 40hp 115hp Stroke Outboards

The **Mercury 16731T01** is a high-performance, versatile outboard motor engineered to deliver exceptional power, reliability, and efficiency for a wide range of boating applications, from fishing and cruising to high-speed recreational use. Part of Mercury s renowned **Verado** lineup, this **40 HP (29.8 kW) and 115 HP (85.8 kW) outboard** (depending on the model variant) combines cutting-edge technology with rugged durability to ensure superior performance in both calm waters and rough seas. With a **4-stroke, liquid-cooled, direct-injection V6 engine**, this outboard delivers a seamless blend of torque, fuel efficiency, and low emissions, making it ideal for boats ranging from mid-sized bass boats and center console rigs to performance cruisers and offshore fishing vessels. The **T01 trim** features a **twin-screw, inboard/outboard (I/O) configuration**, allowing for a streamlined, low-profile installation that enhances maneuverability and reduces drag, while the **digital ignition system** ensures precise fuel delivery and optimal combustion for consistent power output. Engineered with **Mercury s exclusive PowerPole** technology, this outboard provides a smooth, vibration-dampened ride, reducing fatigue for both the operator and passengers, even at high speeds. The **adjustable trim and tilt system** offers precise control over ride height and angle, allowing boaters to fine-tune performance for different conditions whether planing across open water or cruising in shallow, choppy environments. Built to withstand the demands of heavy-duty use, the **16731T01** incorporates **high-strength aluminum construction**, corrosion-resistant coatings, and reinforced components to ensure longevity and resistance to saltwater corrosion, a critical feature for saltwater anglers and offshore enthusiasts. Whether powering a **fast-pack bass boat** for tournament fishing or a **luxury center console** for deep-sea adventures, this outboard delivers the **power, precision, and reliability** that Mercury is renowned for, making it a standout choice for serious boaters who demand nothing less than excellence.

The Mercury 16731T01 is a 40 horsepower (HP) outboard motor that can also function as an 115 HP unit through its **PowerBoost** system, which allows it to temporarily operate at higher power levels for short bursts. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Mercury 16731T01 (40HP/115HP PowerBoost)**

1. **Versatility with PowerBoost**

The ability to switch between 40HP and 115HP (temporarily) makes this motor highly adaptable. It can handle lighter boats efficiently while providing extra power when needed, such as during acceleration or in rough conditions. This is particularly useful for anglers, recreational boaters, or those who occasionally tow small trailers.

2. **Fuel Efficiency**

At its standard 40HP setting, the motor is relatively fuel-efficient compared to larger outboards. This can lead to lower operating costs, especially for smaller boats or frequent short trips.

3. **Lightweight and Compact**

The 40HP engine is smaller and lighter than larger outboards, making it easier to handle and install on smaller boats (e.g., 14 18 feet). This can simplify maintenance, storage, and transportation.

4. **Lower Initial Cost**

Compared to higher-horsepower outboards, the Mercury 16731T01 is more affordable upfront. This makes it a cost-effective option for budget-conscious buyers who don t need constant high power.

5. **Reliability and Brand Reputation**

Mercury is a well-established brand with a strong reputation for durability and aftermarket support. The 40HP model, in particular, is known for being dependable for recreational use.

6. **Ease of Maintenance**

Smaller engines generally require less frequent maintenance than larger ones. The simplicity of the design also means fewer potential points of failure.

7. **Quiet Operation**

At lower power settings, the motor runs quieter than larger outboards, which can be beneficial for fishing or other activities where noise reduction is desirable.

8. **Compatibility with Smaller Boats**

Ideal for boats that don t require heavy-duty performance, such as center console fishing boats, pontoons, or small bass boats. It can also be a good choice for boats that occasionally need extra power without the expense of a larger permanent motor.

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### **Cons of the Mercury 16731T01 (40HP/115HP PowerBoost)**

1. **Limited Power for Heavy Use**

While the PowerBoost feature provides temporary extra power, it is not designed for continuous operation at 115HP. Prolonged use at higher settings can lead to overheating, reduced engine life, and potential damage. This limits its suitability for boats that frequently tow heavy loads or require sustained high performance.

2. **PowerBoost Has Drawbacks**

- The temporary boost is not unlimited; overuse can strain the engine and transmission.

- The motor may not handle prolonged high-speed cruising or rough water as well as a dedicated high-HP outboard.

- Some users report that the PowerBoost feature can cause uneven power delivery or jerkiness during acceleration.

3. **Not Ideal for Large or Heavy Boats**

For boats over 18 20 feet or those carrying heavy loads (e.g., multiple passengers, large trailers, or deep-V hulls), the 40HP motor may struggle to provide adequate acceleration and top-end speed. In such cases, a larger, dedicated high-HP motor would be more appropriate.

4. **Resale Value**

While the initial cost is low, the PowerBoost feature may not add significant long-term value to the motor. Buyers looking for a pure high-performance outboard may prefer a dedicated 115HP model.

5. **Limited Towing Capacity**

If you plan to tow a small trailer or watercraft, the 40HP motor may require careful operation to avoid overheating or stalling, especially in windy conditions. A dedicated high-HP motor would handle towing more reliably.

6. **Potential for Overheating**

Smaller engines can overheat more quickly if operated at or near their maximum capacity for extended periods. The PowerBoost feature exacerbates this risk if misused.

7. **Noise and Vibration at Higher Speeds**

While quieter at lower settings, the motor may become noisier and more vibration-prone when operating at higher speeds or with the PowerBoost engaged.

8. **Fuel and Emissions Considerations**

While fuel-efficient at lower settings, the PowerBoost feature may increase fuel consumption and emissions when used frequently. This could be a concern for environmentally conscious boaters or those in areas with strict emissions regulations.

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### **Conclusion**

The Mercury 16731T01 (40HP/115HP PowerBoost) is an excellent choice for boaters who need a versatile, fuel-efficient, and affordable outboard for lighter boats or occasional high-power needs. Its ability to switch between 40HP and 115HP makes it practical for fishing, recreational use, or light towing, provided the PowerBoost feature is used responsibly. However, it is not suitable for heavy-duty applications, large boats, or sustained high-speed cruising. The trade-off between versatility and power limitations means it may not be the best fit for boaters who prioritize consistent high performance over flexibility.

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### **Recommendation**

- You own a small to medium-sized boat (14 18 feet) that doesn t require constant high power.

- You occasionally need extra power for acceleration or rough conditions but don t plan to use it continuously at 115HP.

- You prioritize fuel efficiency, lower initial cost, and ease of maintenance.

- Your primary use is fishing, leisure cruising, or light recreational boating.

- You frequently tow heavy loads or need reliable high-speed performance.

- Your boat is larger (over 20 feet) or heavily loaded (e.g., deep-V hulls with multiple passengers).

- You plan to operate at or near 115HP for extended periods, as this can damage the engine.

- You prefer a dedicated high-HP outboard for consistent performance without the limitations of PowerBoost.

- If you need more reliable high power, consider a dedicated 75HP or 115HP Mercury outboard without PowerBoost.

- For boats that occasionally need extra power, a 60HP or 75HP outboard with a more robust transmission may offer better long-term performance.

- If you re unsure about your needs, consult a marine dealer to assess whether the PowerBoost feature aligns with your typical boating activities.

Details:

One genuine Mercury safety switch assembly cleaned inspected and tested in good condition. Will fit other Mercury and Mariner motors 40hp to 115hp check for your compatibility. This part is not a serial number or model identifier for an entire outboard engine its replacement component used in various Mercury and related Mariner/Force model's. The part number 16731T01 is a Mercury Marine OEM Switch Assembly often referred to as switch or temperature/pressure assembly in the electrical box area.

Taken from a running Mercury 80hp 2 stroke outboard serial number range 0A996142 - 0B240450 USA motor. It was used across a range of years, roughly 1987 through the late 1990 s/early 2000 listings frequently mention 1999, with examples pulled from 1988, 1991, 1997, and similar era engines.

part #: 16731t01 prices

• $15.00-$29.99

specifications ouboaen:

• for makes: Mercury
• mpn: 16731t01
• part type: Switch
• warranty: 30 Day Warranty
• country of origin: United States
• compatible part numbers: 16731a 1, 58124a28

general ouboaen:

• condition: Used
• Boat Parts > Outboard Engines Components > Electrical Systems

offer ouboaen:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: February 9, 2026
• quantity: 1

seller ouboaen:

• # reviews: 3006
• city: East Northport, New York
• rating: 100.0%

payments ouboaen:

• other
• credit card: Mastercard
• wallet: Paypal

shipping ouboaen:

• type: Calculated
• carrier: USPS
• cost: $8.30
• transit: 3-9 Days
• service: USPS Ground Advantage
• class: Standard

returns ouboaen:

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

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