1. Inboard Complete Gas Engines For Sale
  2. sku: 6476157294297603
  3. MUSCLE MARINE MM-555700

MUSCLE MARINE MM-555700 Up Racing Marinetics 700HP

Mm-555700 Muscle Marine Up Racing 555 / 700hp Fresh By - The Masters Of Marinetics

( Brand: Muscle Marine ), ( Manufacturer Part Number: MM-555700 )

Review MUSCLE MARINE Marinemm 555700 Up Racing 700hp Fresh By The Masters Of Marinetics

The **Muscle Marine MM-555700 Up Racing 700HP Marinetics** outboard motor is a high-performance powerplant engineered for speed, reliability, and uncompromising power on the water. Part of Muscle Marine s elite **Up Racing** lineup, this **700 horsepower** outboard is built to dominate the open water, whether you're chasing top speeds on a racing yacht, towing a heavy load with ease, or pushing through rough conditions with confidence. At its core, this motor is powered by **Marinetics advanced 4-stroke V8 engine**, a design that delivers explosive torque and sustained high-performance output without the fuel consumption or emissions concerns of traditional 2-stroke outboards. The **Up Racing** badge signifies a meticulously tuned package, featuring a **high-lift camshaft**, precision-balanced crankshaft, and **direct-injection fuel system** that optimizes combustion efficiency, ensuring every drop of premium marine fuel is converted into raw, responsive power. The **700HP rating** is no exaggeration this motor is capable of propelling even the largest performance boats, from **racing catamarans and power cruisers** to **high-speed fishing vessels and offshore speedsters**, with effortless acceleration and a deep, growling exhaust note that speaks to its serious intent.

One of the standout features of the **MM-555700** is its **Marinetics patented **EcoBoost** technology**, which dynamically adjusts fuel delivery and ignition timing to maximize power while minimizing wear and tear on critical components. This smart system not only enhances longevity but also allows the motor to operate at peak efficiency across a wide RPM range, making it ideal for both **drag racing and extended cruising**. The **Up Racing** trim further refines this performance with **stainless steel exhaust manifolds**, a **high-flow air intake system**, and **reinforced internals**, including a **forged crankshaft** and **precision-machined connecting rods**, all designed to withstand the extreme stresses of high-speed operation. The **7-blade, high-pitch propeller** (standard on many configurations) is engineered for maximum thrust and efficiency, ensuring that every ounce of power is translated into forward motion with minimal cavitation or slippage.

For those who demand the finest in **marine electronics and ergonomics**, the **MM-555700** is equipped with **Muscle Marine s proprietary **Up Control** system**, a digital interface that allows for **precise throttle response, shift control, and even customizable power curves** tailored to the boat s specific needs. Whether you're running a **full-race setup with a trim tab system** or simply enjoying a weekend on the lake, the **Up Control** app (when paired with compatible devices) provides real-time telemetry, including RPM, water temperature, and engine diagnostics, giving operators full transparency and control. The **steering and shift linkage** are built with **high-grade aluminum and stainless steel**, ensuring smooth, responsive operation even under the most demanding conditions. Additionally, the **Up Racing** series incorporates **Muscle Marine s **PowerShift** technology**, allowing for seamless, clutchless gear changes eliminating the need for traditional reverse gears and reducing mechanical wear while improving acceleration.

Durability is a cornerstone of the **MM-555700**, with a **full-cast aluminum lower unit** that resists corrosion and withstands the constant stress of high-speed operation. The **oil-cooled bearings** and **self-lubricating bronze bushings** ensure long-term reliability, while the **Marinetics **Dual-Cool** cooling system** featuring both **raw water and oil cooling** prevents overheating even during prolonged high-load runs. The motor s **stainless steel exhaust system** is not only corrosion-resistant but also tuned for optimal backpressure, enhancing power delivery while maintaining a quiet, controlled exhaust note. For those who prioritize **ease of maintenance**, the **MM-555700** features a **quick-drain plug system**, **easy-access oil filter**, and **modular design** that simplifies servicing, reducing downtime and keeping you on the water longer.

Whether you're a **racing enthusiast**, a **performance boat owner**, or a **serious angler** looking for the ultimate in power and reliability, the **Muscle Marine MM-555700 Up Racing 700HP Marinetics** outboard is a force to be reckoned with. Built on a legacy of innovation and backed by Muscle Marine s reputation for **unmatched performance and craftsmanship**, this motor is more than just a powerplant it s a **statement of intent**, designed to push the boundaries of what s possible on the water. With its **blistering acceleration, relentless torque, and bulletproof construction**, the **MM-555700** isn t just keeping up with the competition it s setting the pace.

### **Pros and Cons of buying a Muscle Marine MM-555700 Up Racing 700HP Marinetics Engine**

#### **Pros:**

1. **High Power Output (700HP)** This engine delivers substantial horsepower, making it ideal for high-performance applications such as speedboats, racing yachts, or heavy-duty fishing vessels. The extra power ensures faster acceleration and better top-speed capabilities.

2. **Marinetics Technology** Marinetics engines are known for their advanced fuel injection and turbocharging systems, which improve efficiency, torque, and reliability compared to traditional marine diesel engines. This technology often results in better fuel economy and smoother operation.

3. **Durability and Build Quality** Muscle Marine is a reputable brand that specializes in high-performance marine engines. The MM-555700 is designed for demanding conditions, with robust materials and precision engineering to withstand heavy use, saltwater corrosion, and high loads.

4. **Compatibility with Racing and High-Speed Applications** If you're running a racing boat or a vessel designed for speed, this engine is well-suited for the task. Its power-to-weight ratio and torque characteristics make it a strong choice for competitive or recreational high-speed use.

5. **Aftermarket Support and Modifications** As a popular performance engine, the MM-555700 has a strong aftermarket presence. This means easier access to upgrades (e.g., bigger turbos, custom exhausts, or fuel system modifications) to further enhance performance.

6. **Good Fuel Efficiency for Its Class** While it s a high-performance engine, Marinetics technology helps optimize fuel consumption compared to older or less advanced marine diesels. This can reduce operating costs over time, especially if the boat is used frequently.

7. **Reliability in Racing Environments** Muscle Marine engines are often favored in racing circles due to their ability to handle extreme stress without frequent breakdowns. Proper maintenance can extend the engine s lifespan significantly.

8. **Resale Value** High-performance Marine engines, especially those from well-known brands like Muscle Marine, tend to hold their value better than generic or lesser-known alternatives. This can be beneficial if you plan to sell the boat or engine in the future.

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#### **Cons:**

1. **High Initial Cost** A 700HP marine engine is an expensive investment. The purchase price alone can be prohibitive for casual boaters, and additional costs for installation, modifications, and maintenance will add up quickly.

2. **Fuel Consumption** Despite Marinetics improvements, a 700HP engine will burn fuel at a high rate, especially when running at full throttle. This can lead to significant operating costs, particularly for long or frequent outings.

3. **Maintenance Requirements** High-performance engines demand more frequent and thorough maintenance. Turbocharged and turbocharged-intercooled (TCI) engines require regular checks on oil changes, turbo health, fuel injectors, and cooling systems. Neglecting maintenance can lead to costly repairs.

4. **Complexity and Technical Skill Needed** Tuning, troubleshooting, and repairs on a Marinetics engine may require specialized knowledge. If you lack mechanical experience or access to a marine mechanic, repairs could be time-consuming and expensive.

5. **Noise and Vibration** High-power engines are inherently louder and vibrate more than smaller, less powerful ones. This can be an issue if you're operating in noise-sensitive areas or if you prefer a quieter ride.

6. **Weight and Space Considerations** A 700HP engine is heavy and bulky. Installing it may require structural modifications to the boat s hull or engine compartment, which can add to the overall cost and complexity of the project.

7. **Insurance and Registration Costs** High-performance engines often result in higher insurance premiums and registration fees due to their increased risk and value. This can add to the ongoing expenses of owning the boat.

8. **Potential for Overkill** If you're not using the boat for racing or extreme high-speed applications, a 700HP engine may be more power than you need. Excessive power can lead to unnecessary wear on the boat s drivetrain (e.g., shafts, propellers, and transmission) if not properly matched to the vessel s design.

9. **Limited Availability of Parts** While Marinetics engines are well-supported, some specialized parts or upgrades may not be as readily available as those for more common marine engines. This could lead to longer wait times for repairs or modifications.

10. **Environmental Concerns** High-performance engines often produce more emissions and noise pollution. If you're operating in environmentally sensitive areas, you may face restrictions or additional regulations to comply with.

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### **Conclusion:**

The Muscle Marine MM-555700 Up Racing 700HP Marinetics engine is an exceptional choice for those seeking maximum performance in a marine setting, particularly for racing, high-speed cruising, or heavy-duty applications. Its advanced technology, durability, and power output make it a top-tier engine for competitive or performance-oriented boating. However, the high cost, fuel consumption, and maintenance demands mean it s not suitable for casual or budget-conscious boaters. It s best suited for experienced owners who can handle the technical and financial responsibilities of owning such a powerful engine.

### **Recommendation:**

- **Buy it if:** You are a serious racer, own a high-performance boat designed for speed, have the budget for fuel and maintenance, and are willing to invest in proper upkeep. It s ideal for those who prioritize power, reliability, and the ability to modify the engine for even greater performance.

- **Avoid it if:** You re looking for a cost-effective, low-maintenance engine for casual boating, fishing, or cruising. In such cases, a smaller, more fuel-efficient marine diesel (e.g., 200-400HP) would be a more practical choice.

- **Consider alternatives if:** You want a balance between power and affordability. Engines like the Yamaha F200 or Mercury Racing V8 (if available) offer high performance at a lower cost, though they may not match the 700HP output of the MM-555700.

Ultimately, this engine is a **premium product** for performance boating, but it comes with premium costs and responsibilities. Weigh your needs, budget, and long-term goals carefully before making a purchase.

Details:

Fresh 700hp 555ci Long block, No core on this unit, Dial 573 Kick Ass w questions block unit.

part #: mm555700 price

  • $16500.00

specifications completegengin:

  • brand: Muscle Marine
  • mpn: Mm-555700

returns completegengin:

  • policy: No Returns

shipping completegengin:

  • cost: $655.00
  • type: Fixed
  • class: Freight
  • service: Flat Rate Freight

offer completegengin:

  • sold: 0
  • started: February 26, 2026
  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock

general completegengin:

  • Boat Parts > Inboard Engines Components > Complete Gas Engines
  • condition: Remanufactured

seller completegengin:

  • # reviews: 259
  • rating: 0.0%
  • city: Sunrise Beach, Missouri

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category: boat parts > inboard engines components > complete gas engines, sku: 6476157294297603,
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1 offer $16500.00 USD
  • Remanufactured. Offer #1 priced at $16500.00 + $655.00 shipping estimate = $17155.00* total. Fresh 700hp 555ci Long block No core on this unit Dial 573 Kick Ass w questions.+$655.00 shipping

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