1. Cylinder Heads & Parts Engines Components For Sale
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  3. DART 10021070

DART 10021070 Head 807051001327 165CC I/e 72CC S/p 1.94/1.50

fits model: Ss.

10021070 Dart - Sbc 165cc I/e Ss Head 72cc S/p 1.94/1.50 Bare

( Brand: Dart ), ( Manufacturer Part Number: 10021070 ), ( Part Type: Head ), ( UPC: 807051001327 )

Review DART Sbc 165cc I/e Head 72cc S/p 1.94/1.50 Bare fits SS

The **Dart 10021070 165cc I/E Head, 72cc S/P, 1.94/1.50 Bare** is a high-performance, precision-engineered cylinder head designed for enthusiasts seeking optimal combustion efficiency, reliability, and power output in their high-performance or modified engines. This head is meticulously crafted to replace or upgrade stock components in applications ranging from classic muscle cars to modern performance builds, where increased airflow, improved cooling, and enhanced durability are critical. The **165cc combustion chamber** provides a generous volume, allowing for better fuel-air mixture distribution and reduced risk of detonation, which is particularly beneficial in high-compression or forced-induction setups. The **72cc spark plug port** ensures proper clearance for standard or high-performance plugs, accommodating both traditional and modern ignition systems without compromising structural integrity.

This head features a **1.94-inch intake valve** and a **1.50-inch exhaust valve**, dimensions that strike an ideal balance between airflow capacity and mechanical strength. The intake valve s larger diameter facilitates increased volumetric efficiency, allowing more air to enter the combustion chamber during the intake stroke, while the exhaust valve s robust size ensures efficient scavenging of spent gases, reducing backpressure and improving overall engine breathing. The **internally threaded (I/E) design** simplifies installation, as it eliminates the need for separate valve cover gaskets and allows for a cleaner, more streamlined engine bay setup. The **bare** configuration means the head arrives without valves, springs, retainers, or rocker arms, offering full customization flexibility whether you re pairing it with aftermarket components like titanium valves or upgrading to hydraulic lifters for smoother operation.

Constructed from **high-quality cast iron or aluminum** (depending on the specific application), this head is engineered to withstand the stresses of high-performance driving, including forced induction or high-revving applications. The **precision-machined surfaces** ensure tight sealing between the head and block, while the **integrated water jacket passages** promote even cooling, reducing the risk of thermal warping or overheating critical factors in sustained high-output scenarios. Whether used in a naturally aspirated engine seeking a power boost or in a turbocharged or supercharged setup requiring robust airflow management, this head delivers a blend of performance and longevity. Its compatibility with a wide range of engine displacements and configurations makes it a versatile choice for builders looking to push their engines beyond stock limitations while maintaining reliability and efficiency.

### **Pros and Cons of Buying a 1970s Yamaha DT 100 (165cc, I/E Head, 72cc S/P, 1.94/1.50) Analysis and Recommendation**

#### **Overview of the Bike**

The **Yamaha DT 100** (specifically the **165cc model with an I/E head, 72cc sideport cylinder, and 1.94/1.50 compression ratio**) is a classic dual-sport motorcycle from the late 1960s to early 1970s. It was designed for both on-road and off-road use, blending simplicity, durability, and adaptability. Below is a detailed breakdown of its strengths and weaknesses.

---

### **Pros**

1. **Proven Reliability and Durability**

- The DT 100 is renowned for its **simple, robust engine** that can handle rough conditions without frequent breakdowns.

- Many examples still run strong after decades with basic maintenance, making it a **long-term investment** if properly cared for.

- The **air-cooled single-cylinder engine** is forgiving and can tolerate neglect better than modern high-performance bikes.

2. **Off-Road Capability**

- Designed as a **dual-sport**, it excels in **trails, dirt roads, and light overlanding** due to its **knobby tires, long-travel suspension, and lightweight frame**.

- The **sideport cylinder (S/P)** and **low compression ratio (1.50)** allow it to run on **lower-octane fuel** (even gas mixed with oil in off-road use), reducing maintenance costs.

- The **I/E (induction/exhaust) head** improves airflow compared to older models, making it slightly more efficient and smoother.

3. **Simplicity and Ease of Maintenance**

- The engine is **straightforward to work on**, with minimal electronics and no complex fuel injection.

- **No timing chain issues** (unlike some modern bikes) the DT 100 uses a **timing belt**, which is easier to replace than a chain.

- **No expensive sensors or ECUs** repairs are often **DIY-friendly** with basic tools.

- **No clutch cable** (early models had a **clutch fork** system, which is simple but can wear over time).

4. **Lightweight and Maneuverable**

- Weighing around **180 200 lbs (dry)**, it is **easy to handle** for solo riding or light two-up adventures.

- The **short wheelbase** and **low seat height** make it **agile on trails** and easy to park.

5. **Classic Aesthetic and Nostalgia Factor**

- The DT 100 has a **timeless, rugged look** that appeals to enthusiasts who appreciate **vintage motorcycles**.

- It fits well in **off-road, adventure, or retro biking communities**, making it a **conversation piece**.

6. **Fuel Flexibility**

- Can run on **gasoline mixed with oil (for off-road use)** or **pure gasoline (for on-road use)** without major modifications.

- The **low compression (1.50)** allows for **cheaper fuel options**, reducing running costs.

7. **Aftermarket Support**

- A **thriving aftermarket** exists for DT 100 parts, including **performance kits, suspension upgrades, and custom paint jobs**.

- **Common modifications** include:

- **Higher compression heads (1.94)** for better on-road performance.

- **Performance exhausts** for improved airflow.

- **Longer-travel suspension** for rough terrain.

- **Modern fuel injection conversions** (though this adds complexity).

8. **Low Operating Costs**

- **Cheap to insure** (especially if used for off-road only).

- **Minimal electrical components** mean fewer failures.

- **Basic maintenance** (oil changes, chain adjustments, tire rotations) keeps costs low.

9. **Resale Value (for Well-Maintained Examples)**

- A **clean, running DT 100** holds value well, especially if it has **originality or rare features** (e.g., early I/E head models).

- **Restored examples** can appreciate in value among collectors.

10. **Great for Learning**

- Ideal for **new riders** who want a **forgiving, easy-to-ride bike** without modern complexity.

- Teaches **basic mechanical skills** through hands-on maintenance.

---

### **Cons**

1. **Poor On-Road Performance Compared to Modern Bikes**

- **Low power output ( 7 9 HP)** makes it **slow by today s standards**, especially in stop-and-go traffic.

- **No modern ergonomics** the **flat handlebars, upright riding position, and minimal wind protection** make long highway rides **tiring and uncomfortable**.

- **No ABS, traction control, or advanced braking** requires **skilled riding** to handle safely on pavement.

2. **Outdated Suspension and Brakes**

- **Basic telescopic forks and rear swingarm** are **not as smooth or adjustable** as modern suspension.

- **Drum brakes (on early models) or basic disc brakes (later models)** provide **minimal stopping power**, especially in wet conditions.

- **No modern damping technology** bumps and rough roads can be **harsh on rider comfort**.

3. **Fuel Efficiency is Decent but Not Exceptional**

- While **better than most vintage bikes**, it **averages 50 60 mpg** (miles per gallon), which is **decent but not great** for modern standards.

- **No fuel injection** means **carburetor tuning** may be required for optimal performance.

4. **Limited Comfort for Long Rides**

- **No windscreen** means **full-face exposure** at higher speeds.

- **Basic seat** is **not ergonomic** for long-distance touring.

- **No luggage options** carrying gear requires **aftermarket racks or saddlebags**, which can be **unstable at speed**.

5. **Potential for Hidden Mechanical Issues**

- **Rust** (especially in the **frame, swingarm, and exhaust**) is common in older bikes.

- **Worn bearings, bushings, and seals** may require **replacement** if the bike has been neglected.

- **Clutch and transmission wear** can be an issue if not maintained properly.

- **Timing belt** (if not replaced regularly) can **fail catastrophically**, leading to **engine damage**.

6. **No Modern Safety Features**

- **No traction control, slipper clutch, or advanced ABS** requires **experienced riding** to handle safely.

- **No modern lighting** (unless aftermarket LEDs are installed) **headlight and taillight may be dim or unreliable**.

- **No modern electronics** (no speedometer, fuel gauge, or trip computer in stock form).

7. **Parts Availability Can Be Limited**

- While **common in the aftermarket**, **original Yamaha parts** may be **discontinued**.

- **Replacement parts** (e.g., **carburetors, gaskets, bearings**) can be **expensive or hard to find** if not sourced from specialty vendors.

- **Custom or rare modifications** (e.g., **high-performance heads, modern suspension**) may require **third-party fabrication**.

8. **Not Ideal for Heavy Riders**

- **Lightweight frame** may **flex under heavy weight**, affecting handling.

- **Weak suspension** can make it **uncomfortable for riders over 200 lbs**.

9. **Environmental and Noise Concerns**

- **No catalytic converter** **loud and smoky** by modern standards.

- **Poor emissions compliance** **cannot be legally ridden on-road in many places** without modifications (e.g., **catalytic converter, EGR, or emissions testing compliance**).

10. **Depreciation Over Time**

- Unlike some **vintage bikes that appreciate**, the **DT 100 s value declines** as it ages unless **restored to showroom condition**.

- **Commonality reduces exclusivity** many examples exist, so **unique or rare models hold more value**.

---

### **Key Considerations Before Buying**

1. **Intended Use**

- **Best for:** **Off-road, light adventure, commuting in rural areas, or as a project bike.**

- **Not ideal for:** **Highway touring, daily commuting in cities, or heavy-duty adventure riding.**

2. **Condition and Maintenance History**

- **Check for:**

- **Rust** (frame, swingarm, exhaust).

- **Engine wear** (compression, oil leaks, timing belt condition).

- **Suspension health** (fork seals, shock function).

- **Brakes** (pad wear, drum/disc condition).

- **Electrical system** (headlight, switchgear, battery).

- **Avoid bikes with:**

- **Seized bearings** (crankshaft, wheel hubs).

- **Cracked or bent frame**.

- **Neglected carburetion** (flood

Details:

Dart Ss 165 head Needs finished porting 350.00.

part #: 10021070 price

  • $4519.00

specifications cylinderheapar:

  • for models: Ss
  • brand: Dart
  • mpn: 10021070
  • part type: Head
  • upc: 807051001327

returns cylinderheapar:

  • policy: No Returns

payments cylinderheapar:

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offer cylinderheapar:

  • started: February 7, 2026
  • quantity: 1
  • sold: 0
  • best offers: True
  • options: Ship-to-home
  • availability: In Stock

shipping cylinderheapar:

  • service: USPS Ground Advantage, UPS Ground Saver
  • class: Standard, Economy
  • carrier: USPS, UPS
  • cost: $81.21
  • transit: 5-12 Days
  • type: Calculated

general cylinderheapar:

  • Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads
  • condition: Used

seller cylinderheapar:

  • rating: 100.0%
  • # reviews: 4
  • city: Aurora, Colorado
for models: ss, part type: head,
category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, sku: 11458634300481663,
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1 offer $4519.00 USD
  • New. Offer #1 priced at $4519.00 + $100.00 shipping estimate = $4619.00* total. PRICE IS EACH. I HAVE TWO LEFT WITH 215CC RUNNER AND A COUPLE SETS LEFT WITH THE SMALLER RUNNER.+$100.00 shipping

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