HARLEY-DAVIDSON 27162-66B Tilloston Carburetor HD-1B

( Brand: Harley-davidson ), ( Manufacturer Part Number: 27162-66B ), ( Part Type: Carburetor ), ( Ipn: 27162-66 ), ( Oe/oem Part Number: Hd-1b ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Oem Tilloston Carburetor fits XLCH XLH 1966-71

The **Harley-Davidson 27162-66B Tilloston Carburetor (HD-1B, 1966-71 XLCH/XLH)** is a meticulously engineered, mid-century powerhouse designed to deliver the raw, throaty growl that defines the iconic sound of Harley-Davidson s classic "Big Twin" engines. This carburetor, part of Harley s legendary **Tilloston** line, was specifically crafted for the **1966 through 1971 XLCH (Sportster) and XLH (Electra Glide)** models, embodying the bold, unapologetic performance ethos of the era. Built with a **cast aluminum body** and precision-machined internals, the **HD-1B** features a **1.75-inch bore** and a **2.5-inch venturi**, engineered to optimize airflow and fuel delivery for the **74-cubic-inch Evolution-style engine** found in these models. The carburetor s **single-throat design** ensures a deep, resonant exhaust note while maintaining a smooth yet aggressive throttle response, making it a favorite among purists who seek the unfiltered, mechanical character of Harley s golden age.

The **Tilloston HD-1B** stands out for its **mechanical simplicity and durability**, relying on a **tilting float bowl** and a **needle-and-seat assembly** to regulate fuel flow with minimal electronic intervention a hallmark of Harley s classic carburetor philosophy. The **metal-bodied float** and **brass needle** are designed to withstand the high temperatures and rough handling typical of motorcycle use, ensuring reliable performance even under demanding conditions. The carburetor s **adjustable pilot jet** and **main jet** allow for fine-tuning of fuel mixture, catering to everything from stock performance to modified setups, while the **choke mechanism** provides a smooth cold-start experience without sacrificing the engine s natural breathing once warmed up. The **black-painted aluminum body** and **chrome-plated throttle linkage** not only contribute to its classic aesthetic but also protect against corrosion, making it a robust choice for both showroom-ready bikes and project restorations.

For enthusiasts restoring or modifying their **1966-71 XLCH or XLH**, the **27162-66B Tilloston HD-1B** is an essential component for achieving authentic period-correct performance. When paired with the correct **intake manifold** (such as the **Harley-Davidson 27162-66A or 27162-66C**), this carburetor helps recreate the **deep, growling exhaust tone** that made these bikes legendary. Whether installed on a **fully restored Sportster** or a **custom chopper**, the **HD-1B** ensures a connection to Harley s mechanical heritage, delivering the same **unfiltered power and character** that defined the brand s early years. Its **universal compatibility** with aftermarket modifications such as **high-performance jets, custom intakes, or exhaust systems** also makes it a versatile choice for riders looking to enhance their bike s performance while staying true to its vintage soul.

### **Pros and Cons of Buying a Harley-Davidson 27162-66B Tilloston Carburetor (HD-1B, 1966-71 XLCH/XLH)**

1. **Authentic Restoration and Performance**

- The Tilloston carburetor is a factory replacement part for Harley-Davidson s **1966-1971 XLCH (Chopper) and XLH (Hybrid)** models, ensuring proper fit and function. It is a direct swap for the original **HD-1B carburetor**, which was used on these bikes before they transitioned to the **Amal carburetor** in 1972.

- If you are restoring a classic XLCH/XLH, this carburetor will help maintain period-correct performance, throttle response, and fuel delivery.

2. **Better Fuel Economy and Smoothness Compared to Amal**

- The Tilloston carburetor is known for being **more fuel-efficient** than the later Amal carburetors, which were prone to rich mixtures and poor throttle response.

- It provides a **smoother idle and better mid-range power**, making it preferable for cruising and daily riding compared to the Amal s tendency to hog fuel.

3. **Easier to Tune Than Amal Carbs**

- Unlike the **Amal carburetors**, which required frequent adjustments and were notorious for flooding, the Tilloston carburetor has a **simpler tuning process**.

- It uses a **single jet setup** (though adjustments can be made to the main jet and pilot jet), making it more straightforward for riders who prefer mechanical simplicity.

4. **Better for Low-Speed and City Riding**

- The Tilloston carburetor handles **low-speed and stop-and-go traffic** better than the Amal, which could struggle with sluggish throttle response in city conditions.

- This makes it a better choice for riders who frequently ride in urban environments rather than high-speed cruising.

5. **Avoids Common Amal Issues**

- Many XLCH/XLH owners who switched to Amal carburetors later reported **poor fuel economy, rough idling, and difficulty tuning**.

- The Tilloston carburetor avoids these issues, making it a more reliable choice for classic Harley enthusiasts who want to stay true to the original setup.

6. **Nostalgic and Collector-Friendly**

- For **restoration purists**, the Tilloston carburetor is a **factory original component**, making it ideal for maintaining the bike s historical accuracy.

- It is highly sought after by **classic Harley collectors** who prefer the original mechanical simplicity over later modifications.

7. **Easier to Find Than Some Original Parts**

- While not as common as Amal carburetors, the Tilloston carburetor is **still available through specialty suppliers** (such as **Harley-Davidson parts dealers, eBay, or classic Harley restoration shops**).

- It is **less likely to be counterfeit** compared to some aftermarket Amal carburetor replicas.

---

1. **Limited Availability and Higher Cost**

- The Tilloston carburetor is **not as widely stocked** as modern or Amal carburetors, meaning you may need to **search for a reputable seller** rather than finding it at a local Harley dealership.

- Prices can be **higher than aftermarket alternatives**, especially if the part is new or from a trusted supplier.

2. **Requires Some Mechanical Knowledge for Installation**

- Proper **carburetor mounting** (ensuring the correct vacuum and throttle linkage setup).

- **Vacuum hose connections** (must be routed correctly to avoid leaks).

- **Idle speed and mixture adjustments** (may need fine-tuning after installation).

- If you are not comfortable with carburetor work, you may need to **hire a mechanic**, adding to the cost.

3. **Less Power Than Modern or Amal Tuned-Up Setups**

- The Tilloston carburetor is **not as power-hungry** as later Amal carburetors when properly tuned, but it also **does not produce the same high-RPM power** as a modern carburetor or fuel injection.

- If you are looking for **maximum throttle response and high-speed performance**, you may find the Tilloston carburetor **underwhelming** compared to a well-tuned Amal or aftermarket carburetor.

4. **Fuel Economy May Still Be Mediocre by Modern Standards**

- While better than an Amal, the Tilloston carburetor is **not known for exceptional fuel efficiency** classic Harleys were never designed for high mileage.

- If you ride long distances frequently, you may still **consume more fuel** than a modern cruiser or sportbike.

5. **Potential for Wear in Older Units**

- If purchasing a **used Tilloston carburetor**, there is a risk of **internal wear** (such as a worn throttle valve or clogged jets), which could affect performance.

- A **new or rebuilt carburetor** is recommended to ensure optimal function.

6. **Not Ideal for Heavy Modifications**

- If you plan to **modify your XLCH/XLH with a big bore kit, high-compression cylinder, or aggressive camshaft**, the Tilloston carburetor **may not keep up** with the increased power demands.

- In such cases, an **Amal or aftermarket carburetor** (like a **Holley or Mikuni**) might be a better choice.

7. **Limited Aftermarket Support**

- Unlike Amal carburetors, which have **plenty of tuning guides and aftermarket parts**, the Tilloston carburetor has **less community support**.

- Finding **specific jets, gaskets, or repair kits** may be more difficult compared to Amal setups.

---

- **Prioritize authenticity** in their classic XLCH/XLH restoration.

- **Prefer smoother, more fuel-efficient performance** over raw power.

- **Enjoy the mechanical simplicity** of a single-carb setup.

- **Ride mostly in urban or cruising conditions** rather than high-speed drags.

- Want **maximum power and throttle response** (Amal or aftermarket carbs may be better).

- Plan **heavy engine modifications** that exceed the carburetor s capabilities.

- Prefer **modern convenience** (easier tuning, wider availability of parts).

- Are **not comfortable with basic carburetor maintenance**.

---

You are **restoring a 1966-1971 XLCH/XLH** and want **period-correct performance**.

You **dislike the Amal carburetor s fuel hogging and tuning difficulties**.

You **prefer a smoother, more reliable low-to-mid-range setup** for daily riding.

You are **willing to invest time in learning carburetor adjustments** for optimal tuning.

You want **maximum power and high-RPM performance** (consider an Amal or aftermarket carb).

You plan **aggressive engine modifications** (big bore, high compression, etc.).

You **hate tinkering with mechanical components** and prefer plug-and-play solutions.

You **cannot find a reliable seller** or are on a tight budget (used Amal carbs may be cheaper but less ideal).

For **true classic Harley enthusiasts** who want the **original feel and reliability** of their XLCH/XLH, the Tilloston carburetor is a **superior choice** over the later Amal carburetors. However, if you are looking for **modern performance, ease of use, or heavy modifications**, other carburetor options may be more suitable.

If you proceed with the Tilloston carburetor, **purchase a new or professionally rebuilt unit** to ensure longevity and proper function. Proper **tuning and maintenance** will be key to getting the best performance out of it.

Details:

Believe that the HD-1A HD-1B were used with staggered dials. OEM Tilloston Carburetor for Harley-Davidson, Part number HD-1B, Harley part 27162-66B. Part is used but in overall good condition.

Message with any questions. Perhaps its useful info for you, HD-1B 27162-66A Jan. Includes spacer block. Missing some little springs and other small parts.

Everything butterflies, etc move like I'd want them. Will definitely need a clean and rebuild.

part #: 2716266b prices

• $29.00-$98.00

specifications intakefuelmotorcycle:

• for models: Xlch, Xlh
• for makes: Harley
• for years: 1966-71
• brand: Harley-davidson
• mpn: 27162-66b
• part type: Carburetor
• ipn: 27162-66
• oe/oem part number: Hd-1b
• country of origin: United States

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• city: Brookfield, Massachusetts
• rating: 100.0%
• # reviews: 1298

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• started: April 27, 2026
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• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

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