HONDA 15100-147-043 Automatic Oil Pump

( Manufacturer Part Number: 15100-147-043 ), ( Part Type: Oil Pump ), ( Vintage Part: Yes )

Review HONDA Express Speed Automatic Oil Pump Assembly fits NC50 1978–1982

The **Honda 15100-147-043 NC50 Automatic Oil Pump** from the late 1970s and early 1980s is a meticulously engineered component designed to deliver precise lubrication and cooling to the engine s internal mechanisms in Honda s iconic NC50 motorcycle series. This oil pump, originally manufactured for models produced between **1978 and 1982**, is a critical part of the motorcycle s automatic lubrication system, ensuring smooth operation by maintaining optimal oil pressure throughout the engine s moving parts. Crafted with Honda s signature attention to detail, the pump features a robust **rotary vane design**, which efficiently circulates oil from the reservoir to the crankcase and other high-friction areas, reducing wear and preventing premature failure. The unit is built with **durable cast aluminum housing**, providing both strength and lightweight performance, while the internal components including precision-machined vanes and a sealed drive mechanism are engineered to withstand the demands of high-revving, air-cooled engines. This oil pump is particularly sought after by restorers and enthusiasts of the NC50, as it plays a vital role in restoring the motorcycle s original performance and reliability. Whether used in a classic restoration project or as a direct replacement for a worn-out original, this part ensures that the engine operates with the same efficiency and longevity for which Honda s early motorcycles were renowned. Its compatibility with the NC50 s automatic lubrication system where oil is drawn from a separate tank rather than the fuel supply makes it an essential component for maintaining the motorcycle s legendary simplicity and durability. For collectors and mechanics alike, this oil pump represents a perfect blend of functional engineering and timeless design, embodying the spirit of Honda s early motorcycle innovations.

### **Pros and Cons of buying a Honda NC50 Automatic Oil Pump (Part #15100-147-043, 1978 1982 Models)**

1. **Reliability for Classic Motorcycles** The NC50 is a well-known, durable motorcycle, and its automatic oil pump is designed to handle the demands of a single-cylinder engine. Many owners report long-term reliability if maintained properly.

2. **Easy to Find and Replace** As a common Honda part, this oil pump is widely available from aftermarket suppliers, Honda dealerships, and online marketplaces. Replacement is straightforward for mechanics with basic tools.

3. **Cost-Effective Repair** Compared to rebuilding or replacing the entire engine, replacing the oil pump is a relatively inexpensive fix, often costing between $50 $150 depending on labor and part sourcing.

4. **Prevents Major Engine Damage** A failing oil pump can lead to catastrophic engine failure due to lubrication starvation. Replacing it early avoids costly repairs like piston seizure or bearing damage.

5. **Aftermarket Support** Many aftermarket manufacturers produce compatible oil pumps, sometimes at lower prices than OEM parts. These can be just as reliable if sourced from reputable sellers.

6. **Simple Installation** The pump is typically mounted on the engine s crankcase, and replacement involves removing a few bolts, installing the new pump, and refilling oil no complex modifications are needed.

7. **Long-Term Cost Savings** Fixing a known issue like an oil pump failure is cheaper than dealing with a seized engine or transmission problems caused by poor lubrication.

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1. **Age and Wear** The NC50 is an older model, and the oil pump itself may be nearing the end of its lifespan, especially if the bike has high mileage or was not well-maintained. Replacement may need to be repeated in a few years.

2. **Potential for Counterfeit Parts** Some aftermarket or eBay sellers offer knockoff oil pumps that may not fit correctly or last as long as genuine parts. Buying from trusted sources is essential.

3. **Labor Dependency** If you lack mechanical experience, replacing the pump requires careful handling to avoid damaging seals, gaskets, or the engine s timing. Professional labor adds to the cost.

4. **Compatibility Issues** While the part number is standard for 1978 1982 NC50s, some variations (e.g., carburetor or engine modifications) might require additional adjustments or a slightly different pump model.

5. **Ongoing Maintenance Needs** Even with a new oil pump, the NC50 s engine benefits from regular oil changes, chain adjustments, and general upkeep. Neglecting these can reduce the pump s lifespan.

6. **Limited Warranty** Most aftermarket parts come with minimal or no warranty, whereas OEM parts may offer a short warranty from Honda dealerships. If the pump fails soon after installation, you may be out of luck.

7. **Opportunity Cost** If the bike is otherwise unreliable (e.g., worn clutch, transmission, or frame), spending money on the oil pump may not be the best use of funds. Prioritizing critical repairs first could be more practical.

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Buying and replacing the **Honda NC50 automatic oil pump (15100-147-043)** is a **practical and cost-effective solution** for preventing engine failure in a 1978 1982 NC50. The pros such as reliability, ease of replacement, and affordability outweigh the cons if you source the part from a trusted supplier and perform the work carefully. However, it s important to weigh this against the bike s overall condition. If the NC50 has other major issues (e.g., transmission problems, frame rust, or electrical failures), addressing those first may be more strategic.

If the bike is a **project you plan to restore or ride occasionally**, replacing the oil pump is a **smart preventive measure**. If it s a **daily rider or a bike you intend to keep long-term**, ensure the rest of the engine and drivetrain are in good shape to maximize the pump s lifespan.

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1. **Verify the Part Number** Confirm that **15100-147-043** is the correct pump for your specific NC50 model year and engine variant. Cross-reference with a repair manual or trusted mechanic.

2. **Source the Part Wisely**

- **OEM (Honda dealership or authorized parts store):** Most reliable but may be pricier.

- **Reputable aftermarket brands (e.g., Honda Performance Parts, Speed-Pro, or trusted eBay sellers):** Often cheaper and just as durable if the seller has good reviews.

- Avoid unknown or "no-name" brands to prevent compatibility issues.

3. **Budget for Labor** If you re not comfortable with engine work, allocate **$50 $100 for labor** (or learn to do it yourself with a repair guide).

4. **Check for Related Issues** While replacing the pump, inspect the **oil filter, seals, and crankcase for leaks or wear**. Addressing these simultaneously can prevent future problems.

5. **Consider a Full Engine Refresh** If the NC50 has **high mileage (over 20,000 miles) or signs of wear (oil leaks, rough idle, or poor performance)**, replacing just the oil pump may be a temporary fix. In that case, evaluate whether a **full engine rebuild or swap** (e.g., with a used NC70 or CB750 engine) would be more cost-effective long-term.

6. **Maintain the Bike Post-Repair**

- Change the oil **every 500 1,000 miles** (or as recommended for classic bikes).

- Check the **chain tension and lubrication** regularly.

- Monitor for **unusual noises or oil leaks**, which could indicate other issues.

**Proceed with the oil pump replacement** if the bike is otherwise sound and you re confident in the part s quality. If the NC50 is a **high-mileage project**, prioritize other critical repairs first. For a **reliable, low-mileage bike**, this is a **worthwhile investment** to extend its lifespan.

Details:

Good Condition, tested, May fit other years model's, Verify fitment before purchase. Thanks Lot #4.

part #: 15100147043 prices

• $95.00-$97.71

specifications cyclevintagee:

• for models: Nc50
• for makes: Honda
• for years: 1978-1982
• mpn: 15100-147-043
• part type: Oil Pump
• vintage part: Yes

payments cyclevintagee:

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

seller cyclevintagee:

• rating: 100.0%
• city: Skidmore, Missouri
• # reviews: 378

shipping cyclevintagee:

• type: Fixed
• cost: $7.00
• carrier: USPS
• class: Standard
• service: USPS Ground Advantage
• transit: 4-10 Days

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

returns cyclevintagee:

• policy: No Returns

offer cyclevintagee:

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

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