1. Boat Outboard Engines To Buy
  2. sku: 23761143850293663
  3. MERCURY 82887M

MERCURY 82887M Magneto Armature Plate 2-CYL

fits model: Mariner. make: Yamaha, Mercury. year: 1977-78.

82887m Mercury Yamaha Mariner 1977-78 Magneto Armature Plate 5 Hp 2-cyl 1 Year Warranty

( Brand: Mercury ), ( Manufacturer Part Number: 82887M ), ( Part Type: Hp Magneto Plate ), ( Country Of Manufacture: Japan ), ( Donor Motor: Loose ), ( Warranty: 1 Year )

Review MERCURY Yamaha Magneto Armature Plate Hp 2-cyl Year Warranty fits MARINER 1977-78

The **Mercury 82887M Yamaha Mariner 1977-78 Magneto Armature Plate** is a meticulously crafted, high-performance component designed to restore or enhance the reliability and ignition efficiency of classic Yamaha 2-cylinder outboard motors from the late 1970s. This armature plate, part of the magneto system, serves as the critical interface between the flywheel and the ignition mechanism, ensuring precise timing and consistent spark generation for optimal engine performance. Engineered from durable, high-grade metal, this replacement part is built to withstand the demands of marine environments, where exposure to saltwater, humidity, and vibration can accelerate wear on original components. The design aligns seamlessly with the 1977-78 model year Yamaha Mariner outboards, offering an exact fit for the 2-cylinder engine configuration, which was commonly found in smaller, high-speed recreational boats of the era. Whether used for restoration projects, performance upgrades, or routine maintenance, this armature plate eliminates common ignition issues such as misfires, weak sparks, or erratic starting problems often exacerbated by corrosion or mechanical degradation over time. Its robust construction and precision engineering make it an ideal solution for enthusiasts seeking to preserve the authenticity and functionality of their vintage Yamaha outboards while ensuring smooth, dependable operation. By integrating this component into the magneto assembly, boat owners can restore the original performance characteristics of their engines, extending their lifespan and maintaining the classic charm of these iconic marine powerplants.

The **Mercury 82887M Yamaha Mariner 1977-78 2-cylinder outboard** (specifically the magneto armature plate model) is a classic, older marine engine with distinct advantages and drawbacks. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros**

1. **Classic Reliability (When Properly Maintained)**

- Older Yamaha 2-cylinder outboards, particularly from the late 1970s, were known for their durability if regularly serviced. Many still function well in light-duty applications (e.g., small fishing boats, dockside use, or occasional outings).

- The magneto ignition system (pre-electronic) was robust and could last decades with minimal wear, though it requires occasional adjustments.

2. **Simplicity and Accessibility**

- The design is straightforward, making repairs and maintenance easier for those with mechanical skills. Parts like spark plugs, ignition components, and basic seals are relatively simple to replace.

- No complex electronics mean fewer points of failure compared to modern outboards.

3. **Lower Initial Cost**

- Purchasing a used 1977-78 Yamaha 2-cylinder is significantly cheaper than buying a new or even a modern used outboard. This makes it attractive for budget-conscious buyers or those on a tight budget.

- Fuel and maintenance costs are also lower compared to larger, modern engines.

4. **Lightweight and Maneuverable**

- The 2-cylinder model is lightweight, making it ideal for small boats (e.g., 12 16 ft fishing boats, dinghies, or tender boats). It s easier to handle than larger 4-stroke or modern 2-stroke outboards.

- The compact size allows for easy storage and transport.

5. **Nostalgia and Collectibility**

- For enthusiasts, older Yamahas hold sentimental value and can be part of a collection. Some buyers enjoy restoring and maintaining vintage engines as a hobby.

- In certain circles, well-preserved older outboards are sought after for their historical significance.

6. **Fuel Efficiency (For Its Era)**

- While not efficient by modern standards, the 2-cylinder design was relatively fuel-efficient for its time, especially in light loads. It consumes less gas than larger engines, which can be an advantage for short trips.

7. **Minimal Environmental Concerns (Compared to Older 2-Strokes)**

- Unlike the infamous "gas-guzzling" 2-stroke outboards of the 1970s (which were banned in many areas due to pollution), this engine likely uses a 2-stroke design but may have been less polluting than its contemporaries. However, it still produces more emissions than modern 4-stroke outboards.

---

### **Cons**

1. **Age-Related Wear and Tear**

- The engine is **40 years old**, meaning critical components like the piston, crankshaft, cylinder walls, and seals are likely worn out or degraded. Running it without a full rebuild or replacement of major parts can lead to catastrophic failure.

- Rust, corrosion, and deterioration of internal parts (e.g., bearings, gaskets) are common in older outboards exposed to saltwater.

2. **Lack of Modern Safety and Emissions Standards**

- Older outboards do not meet today s emissions regulations, which could be an issue if used in protected waters or areas with strict environmental laws.

- The lack of modern safety features (e.g., kill switches, remote controls, or integrated electronics) makes operation less convenient and potentially riskier.

3. **High Maintenance Requirements**

- Regular maintenance is **non-negotiable**. This includes:

- Frequent oil changes (older engines burn oil faster).

- Replacement of worn seals, gaskets, and impellers.

- Ignition system adjustments (magneto points or condenser may need replacement).

- Potential need for a full rebuild or engine swap if the block is damaged.

- If the engine hasn t been maintained, the cost of restoring it could exceed the value of the boat itself.

4. **Performance Limitations**

- The 2-cylinder model is **low-powered** (typically around 10 15 horsepower, depending on model year). It s only suitable for small boats and light-duty use. Expect slow acceleration, poor top-end speed, and difficulty handling rough water.

- The engine may struggle with heavy loads (e.g., towing, rough seas, or larger boats).

5. **Parts Availability and Cost**

- While Yamaha parts are still available, finding **original OEM components** for a 40-year-old engine can be difficult and expensive. Aftermarket parts may not fit perfectly or could be of lower quality.

- Labor costs for repairs can be high, especially if a mechanic lacks experience with vintage outboards.

6. **Fuel and Environmental Issues**

- Older 2-stroke engines (if this is one) are inefficient and polluting. They consume fuel rapidly and produce significant exhaust fumes, which can be problematic in enclosed areas or near sensitive ecosystems.

- Modern fuel standards have changed, and older engines may not run well on today s fuel blends (e.g., ethanol content can damage rubber seals).

7. **Resale Value and Longevity**

- The engine has **limited resale value**. Even if restored, it will never be worth as much as a modern outboard. The boat itself may also depreciate quickly if the engine is unreliable.

- If the engine fails while on the water, recovery and repairs could be costly, especially in remote areas.

8. **Safety Concerns**

- Older outboards lack modern safety features like:

- Integrated kill switches.

- Remote start/stop controls.

- Electronic tachometers or fuel gauges.

- Modern hull connections (older wiring and connectors can fail).

- The lack of these features increases the risk of accidents or equipment failure.

9. **Legal and Insurance Restrictions**

- Some marinas, rental companies, or insurance providers may **ban or restrict** the use of older outboards due to safety or environmental concerns.

- Insurance premiums for boats with vintage engines may be higher or harder to obtain.

10. **Time and Skill Investment**

- Restoring or maintaining this engine requires **time, patience, and mechanical skill**. Buyers must be prepared to either:

- Spend hundreds (or thousands) of dollars on repairs.

- Learn how to diagnose and fix issues themselves.

- Accept that the engine may not last long without major work.

---

### **Conclusion**

The **Mercury 82887M Yamaha Mariner 2-cylinder outboard (1977-78)** is a **high-risk, low-reward purchase** unless you are:

- A **restoration enthusiast** with the time, money, and skills to fully rebuild and maintain it.

- Using it for **very light, occasional duty** (e.g., a dockside fishing boat or a backup engine for a small tender).

- Willing to **replace the engine entirely** with a modern used outboard if the original fails.

For **most buyers**, the costs of restoring and maintaining this engine will outweigh its benefits. Modern used outboards (even older 4-stroke models) offer **far better reliability, performance, and safety** at a similar or lower cost. The only scenarios where this engine makes sense are:

1. **As a hobby project** for someone passionate about vintage mechanics.

2. **For a very specific, low-demand use case** where no other engine fits (e.g., a rare boat model that only runs on this size).

3. **If purchased at an extremely low price** (e.g., $200 $500) and you re prepared to scrap it or replace it immediately.

---

### **Recommendation**

**Avoid purchasing this engine unless you are an experienced mechanic with deep pockets and a strong passion for restoration.** Instead, consider:

1. **Buying a used 4-stroke outboard** (e.g., Yamaha 400 600 series, Mercury 90 150 HP) for better reliability and lower long-term costs.

2. **Replacing the engine entirely** if you find a boat with this outboard but no intention of restoring it.

3. **Looking for a modern used outboard** (even a 10-year-old model) that meets your power and performance needs without the maintenance headaches.

If you **must** proceed with this engine:

- **Get a professional inspection** from a Yamaha specialist or marine mechanic.

- **Budget for a full rebuild** (expect $1,500 $3,000 depending on condition).

- **Accept that it will likely not last long** without constant upkeep.

- **Ensure the boat s value isn t tied to this engine** (i.e., don t buy a rare boat that only runs on this model unless you re prepared to replace it).

For **90% of buyers**, the time and money spent on this engine would be better directed toward a more modern, reliable alternative.

Details:

Lead: 82887M, Supersedes: 81017M. Removed from a documented engine, bench-tested, cleaned, and inspected before listing. 82887M Yamaha Mariner 1977-78 Magneto Armature Plate 5 HP 2-Cyl 1 Year Warranty Details.

Mercury magneto armature plate for 5 HP, 1977-1978. Part Numbers. OEM part, removed from a documented running-era engine, Bench-tested electrically, winding's within spec, Cleaned and inspected, no cracks, broken wires, burnt insulation, Connectors clean intact. Verify by model number before purchasing.

Built by Yamaha for Mercury Marines Mariner import line during the original joint-venture era. Buyer pays return shipping. Includes the armature plate base with stater and ignition components mounted under flywheel. 2-cylinder 2-stroke.

Please verify by model or serial number before purchasing. South central Outboards Altman, IL.

part #: 82887m prices

  • $44.95-$125.00

specifications ouboaen:

  • for models: Mariner
  • for makes: Yamaha, Mercury
  • for years: 1977-78
  • brand: Mercury
  • mpn: 82887m
  • part type: Hp Magneto Plate
  • country of manufacture: Japan
  • donor motor: Loose
  • warranty: 1 Year

seller ouboaen:

  • # reviews: 35028
  • rating: 99.9%
  • city: Altamont, Illinois

general ouboaen:

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

returns ouboaen:

  • policy: No Returns

shipping ouboaen:

  • type: Fixed
  • cost: $0.00
  • service: Standard
  • class: Standard
  • transit: 2-6 Days

offer ouboaen:

  • started: May 6, 2026
  • quantity: 1
  • options: Ship-to-home
  • sold: 0
  • availability: In Stock

payments ouboaen:

  • credit card: Diners-club
  • wallet: Google-pay
  • other
for models: mariner, for makes: yamaha, mercury, for years: 1977-78, part type: hp magneto plate, country of manufacture: japan, donor motor: loose, warranty: 1 year,
category: boat parts > outboard engines components, sku: 23761143850293663,
Mercury 82887M Is Similar To:
ouboaen logo
2 offers $44.95–$125.00 USD
  • Used. Offer #1 priced at $125.00 + $0.00 shipping estimate = $125.00* total. 1 Year Warranty. Lead: .FREE SHIPPING
  • Used. Offer #2 priced at $44.95 + $20.90 shipping estimate = $65.85* total. Taken from a 5hp 1977 Mariner air cooled 661S outboard motor will fit other years motors check for your compatibility. One Mariner OEM magneto flywheel assembly with fan and nut cleaned and inspected in good condition.+$20.90 shipping

Copyright © ouboaen.com