HARLEY-DAVIDSON 66394-93 Engine Motor Oil Pump Transmission Cover

( Brand: Harley-davidson ), ( Manufacturer Part Number: 66394-93 ), ( Part Type: Oil Cover Engine Motor Pump Transmission ), ( Machine Type: Street Motorcycle ), ( Material: Chrome ), ( Vintage Part: No ), ( California Prop 65 Warning: Warning, Which Are Known To The State Of California To Cause Cancer And Reproductive Harm. ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Chrome Engine Motor Oil Pump Transmission Cover fits ELECTRA GLIDE FLH 1998

The **Harley-Davidson 66394-93 Engine Motor Oil Pump Transmission Cover** from the **1998 Electra Glide FLH** is a meticulously crafted, high-performance component designed to ensure optimal lubrication and protection for one of the most iconic and enduring motorcycle engines in history. This precision-machined cover serves as a critical interface between the oil pump and the transmission, housing the internal mechanisms that regulate oil flow to the crankshaft, camshaft, and other vital moving parts of the **Evo II 1200cc V-Twin** powerplant. Crafted from durable **cast aluminum**, the cover is engineered to withstand the intense heat, pressure, and vibrations inherent to Harley-Davidson s legendary big-twin engines, providing a robust seal that prevents leaks and maintains peak performance under demanding riding conditions. The **1998 FLH** model, part of Harley s legendary **Electra Glide** lineup, features this transmission cover as part of its **Evo II** engine architecture, which introduced refinements in oil flow and cooling to enhance reliability and longevity. Whether you're restoring a classic Electra Glide, performing routine maintenance, or upgrading an existing build, this **OEM-specification part** ensures a perfect fit, seamless operation, and the unmistakable Harley-Davidson quality that riders have trusted for generations. Its inclusion in the **66394-93** part number designation confirms its compatibility with the **FLH s** transmission system, making it an essential component for maintaining the engine s legendary durability and the smooth, torque-rich performance that defines Harley-Davidson s legacy.

### **Pros and Cons of Buying a 1998 Harley-Davidson Electra Glide FLH Engine (Part Number: 66394-93) with Motor Oil Pump and Transmission Cover**

1. **Authentic Harley-Davidson Performance** This engine is a genuine Harley-Davidson unit from the late '90s, known for its classic V-twin power and iconic Harley sound. It retains the brand s reputation for durability and craftsmanship in its era.

2. **Proven Reliability (for the Model Year)** The 1998 Electra Glide FLH was part of Harley s Evolution engine line, which was well-regarded for its smooth operation and longevity compared to earlier models. If properly maintained, this engine can last for many years.

3. **Aftermarket Support** Harley-Davidson engines from this era have a strong aftermarket presence, meaning you ll find parts, modifications, and tuning options available. Common upgrades include performance air filters, exhaust systems, and electronic fuel injection (EFI) conversions.

4. **Classic Harley Styling** The Electra Glide FLH is a cruiser with a distinctive, timeless design. If you appreciate the classic Harley look, this bike offers a nostalgic riding experience.

5. **Potential for Restoration or Modification** If the engine is in need of work, it can be a rewarding project for a mechanic or enthusiast. Many parts are still available, and restoration can breathe new life into an older bike.

6. **Lower Cost Compared to New Motorcycles** Purchasing a used engine (or a bike with this engine) is significantly cheaper than buying a new motorcycle, making it an attractive option for budget-conscious buyers.

7. **Community and Enthusiast Appeal** Harley-Davidson has a passionate community, and owning a classic model like this can be appealing to riders who enjoy the brand s history and culture.

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1. **Age and Wear** A 1998 engine, especially if it hasn t been well-maintained, may have significant wear on critical components such as the oil pump, transmission cover, and internal engine parts. This could lead to costly repairs if the engine isn t in good condition.

2. **Potential for Hidden Damage** Without a thorough inspection, issues like oil leaks, worn bearings, or a failing oil pump (which is part of the purchase) could go unnoticed. The transmission cover may also show signs of wear or damage that could affect shifting performance.

3. **Maintenance Requirements** Older Harley engines require regular upkeep, including valve adjustments, carburetor tuning (if not EFI), and fluid changes. Neglecting maintenance can lead to premature failure.

4. **Limited Modern Technology** The 1998 Electra Glide FLH lacks modern advancements like electronic throttle control, advanced fuel injection systems, or modern safety features. This may limit performance and comfort compared to newer bikes.

5. **Parts Availability and Cost** While parts are still available, some components may be harder to source than on newer models. Prices for OEM parts can also be higher than aftermarket alternatives, which may not always be as reliable.

6. **Reliability Concerns with the Oil Pump** The oil pump is a critical component for engine longevity. If it s failing or worn out, it could lead to lubrication issues, increased wear, and potential engine damage. Replacing it may be necessary, adding to the cost.

7. **Resale Value** Classic Harley-Davidson motorcycles, while desirable, do not hold their value as well as newer models. If you plan to sell it later, you may not recoup a significant portion of your investment.

8. **Environmental and Emissions Regulations** Older Harley-Davidson models may not meet modern emissions standards in some regions, which could limit where you can ride or require modifications to comply with local laws.

9. **Potential for Electrical Issues** The 1998 Electra Glide FLH uses older electrical systems that may be prone to failures, such as faulty wiring, weak batteries, or issues with the ignition system.

10. **Riding Experience Limitations** Compared to modern cruisers, the 1998 Electra Glide FLH may feel less refined in terms of ergonomics, suspension comfort, and power delivery. The engine may also be less efficient and produce more noise and vibration.

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Buying a 1998 Harley-Davidson Electra Glide FLH engine (part number 66394-93) along with the motor oil pump and transmission cover can be a great choice if you are looking for a classic Harley experience, enjoy working on or restoring motorcycles, or are on a tight budget. The engine s reputation for durability, combined with the aftermarket support and nostalgic appeal, makes it an attractive option for enthusiasts.

However, the age of the engine and potential hidden issues such as wear on the oil pump, transmission cover, or internal components mean that purchasing it used comes with risks. If you are not prepared for potential repairs, maintenance, or modifications, the costs could add up quickly. Additionally, if you prioritize modern comfort, performance, and reliability, a newer Harley or another brand may be a better fit.

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- Purchase the engine with the intention of restoring or modifying it. Inspect it thoroughly (or have a trusted mechanic do so) to check for wear on the oil pump, transmission cover, and other critical parts. Budget for potential repairs or replacements.

- Consider buying the engine as part of a complete bike if possible, as this allows for a more comprehensive inspection of the entire system.

- Avoid purchasing the engine unless you are confident in your ability to diagnose and fix issues. Consider buying a newer Harley or a different model with a warranty or better reliability.

- If you do proceed, allocate a significant budget for maintenance and potential repairs, especially if the oil pump or transmission cover shows signs of wear.

- Look for a well-maintained 1998 Electra Glide FLH from a reputable seller who can provide service records. Test-ride the bike to ensure it runs smoothly and has no obvious issues.

- Be prepared for higher maintenance costs compared to a newer bike, but weigh this against the enjoyment of riding a classic Harley.

- If your goal is performance or modern features, consider a newer Harley-Davidson model with a warranty or a used bike from the last 10 years that has been well-maintained.

- If you re focused on cost savings, explore other brands or used engines from reliable manufacturers that offer better reliability for the price.

Ultimately, the decision depends on your priorities: whether you value the classic Harley experience, are willing to invest time and money in maintenance, and can tolerate the limitations of an older engine. For most casual riders, a newer or better-maintained bike may offer a more practical and enjoyable solution.

Details:

Parts compatibility list is a rough guide. Feel free to call/Text with any questions or concerns EIGHT ONE FOUR NINE ZERO. Shipping USA and Combined.

Parts will fit HARLEY TOURING FRAME model's with an Eco motor setup. All parts were removed from a 1998 HARLEY DAVIDSON FLH ELECTRA GLIDE WITH 48K ORIGINAL MILES. Parts may fit more then whats listed. Parts may fit more/less then whats listed.

Sorry, NO APO's, must have actual address. Shipping costs are for lower 48 states only.

part #: 6639493 prices

• $40.00-$71.10

specifications cyclevintagee:

• for models: Flh, Electra, Glide
• for makes: Harley
• for years: 1998
• brand: Harley-davidson
• mpn: 66394-93
• part type: Oil Cover Engine Motor Pump Transmission
• machine type: Street Motorcycle
• material: Chrome
• vintage part: No
• california prop 65 warning: Warning, Which Are Known To The State Of California To Cause Cancer And Reproductive Harm.
• unit type: Unit
• country of origin: United States

shipping cyclevintagee:

• cost: $14.00
• type: Fixed
• class: Standard
• service: Standard
• transit: 3-7 Days

general cyclevintagee:

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

seller cyclevintagee:

• rating: 99.8%
• # reviews: 10173
• city: Tarpon Springs, Florida

returns cyclevintagee:

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

offer cyclevintagee:

• options: Ship-to-home
• quantity: 1
• availability: In Stock
• sold: 0
• started: February 17, 2026

payments cyclevintagee:

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

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