YAMAHA 41G-85540-M0 Cdi Igniter 3A3-85540-20-00

( Manufacturer Part Number: 41G-85540-M0 ), ( Part Type: Igniter ), ( Non-domestic Product: No ), ( Machine Type: Cdi ), ( Color: Black ), ( Compatible Model: V80 Rxs Rx125, Dt100, Dt80, Dt 80, Dt 100, Gt80, Gt 80 ), ( Material: Plastic ), ( Vintage Part: Yes ), ( Placement On Vehicle: Front, Left, Right ), ( Oe/oem Part Number: 3a3-85540-20-00 ), ( Compatible Year: 1982, 1983, 1978, 1979, 1980, 1981 ), ( Country Of Origin: Japan )

Review YAMAHA Oem Cdi Igniter fits DT80 DT100 GT80 1978–1983

The **Yamaha 41G-85540-M0 (3A3-85540-20-00) CDI Igniter** is a meticulously engineered ignition component designed exclusively for Yamaha s iconic **DT80, DT100, and GT80** motorcycles produced between **1978 and 1983**. This high-performance part is a direct replacement for the original **CDI (Capacitor Discharge Ignition) unit**, ensuring seamless compatibility with the bike s electrical system while delivering the precise spark timing required for optimal engine performance. Crafted with Yamaha s signature attention to detail, this igniter features a robust, corrosion-resistant construction, incorporating a high-quality **silicon-controlled rectifier (SCR)** and a durable **capacitor assembly** to handle the demanding electrical demands of the bike s twin-cylinder, air-cooled engine. The **3A3-85540-20-00** designation confirms its authenticity as an OEM-level component, free from the compromises often found in aftermarket alternatives. Whether restoring a classic Yamaha to its original glory or upgrading an existing system for improved reliability, this CDI igniter guarantees a **consistent, high-energy spark** that enhances throttle response, fuel efficiency, and overall engine longevity. Its compact yet rugged design ensures easy installation, fitting snugly into the bike s wiring harness without the need for modifications, making it an ideal choice for both mechanics and enthusiasts seeking to preserve the integrity of their vintage Yamaha. With its proven track record in Yamaha s legendary dual-spark ignition systems, this part stands as a testament to the brand s enduring commitment to precision engineering and timeless performance.

### **Pros and Cons of Buying a 1978 1983 Yamaha DT80/DT100/GT80 with a 3A3-85540-20-00 CDI Igniter (41G-85540-M0)**

#### **Pros**

1. **Classic Reliability** Yamaha s early dual-sport bikes (DT80/DT100/GT80) are known for their robust, simple mechanical designs. With proper maintenance, they can last decades with minimal issues beyond basic wear.

2. **Proven Engine** The 80cc and 100cc air-cooled single-cylinder engines are durable and easy to work on. Many still run strong after 40 years with basic upkeep (oil changes, chain adjustments, valve checks).

3. **Lightweight and Maneuverable** These bikes weigh around **180 220 lbs (80 100 kg)**, making them easy to handle, park, and transport. Their small size is ideal for urban commuting, trail riding, or storage in tight spaces.

4. **Low Cost of Ownership** Parts are widely available (especially in the U.S. and Europe), and labor costs are minimal since they re simple machines. A full rebuild can often be done for **$500 $1,500**, depending on parts sourcing.

5. **Nostalgia and Collectibility** For enthusiasts, these bikes hold sentimental value as part of the early dual-sport era. Some models (especially rare or well-preserved examples) appreciate in value over time.

6. **Off-Road Capability** The DT80/DT100 were designed for adventure, with **knobby tires, long-travel suspension (for the time), and a rugged frame**. While suspension quality has degraded over decades, they can still handle light trails or gravel roads.

7. **Easy to Modify** The bikes accept aftermarket upgrades like **modern tires, suspension forks, exhaust systems, and electronic ignition conversions**. A CDI upgrade (like the one you re considering) can improve reliability and starting.

8. **Fuel Efficiency** With a **5-gallon fuel tank** and ** 100 mpg** (varies by riding style), these bikes are economical to run, especially for short trips.

9. **Minimal Environmental Impact** Running on **lead-free gasoline** (if properly maintained) and producing low emissions makes them a green choice compared to modern gas-guzzling vehicles.

10. **Community Support** There are active forums (e.g., **Yamaha DT Owners Club, Classic Bike Forums**) where owners share tips, parts lists, and restoration advice.

---

#### **Cons**

1. **Age-Related Wear** After **40 years**, most components (suspension, brakes, clutch, engine internals) will need **significant attention or replacement**. Rust, seized bearings, and worn-out rubber parts are common.

2. **Electrical Issues** The **original points ignition system** is prone to failure, leading to misfires, poor starting, and rough idling. The **3A3-85540-20-00 CDI igniter** you re considering is an upgrade, but even CDI systems can fail over time. A **full electrical overhaul** (wiring, battery, regulator) may be needed.

3. **Suspension Degradation** The **spring perch forks** and **rear swingarm** are often **stiff, leaky, or seized**. Rebuilding or replacing them is costly and labor-intensive.

4. **Brakes Are Weak** The **drum brakes** (front and rear) are **ineffective for modern safety standards**, especially at higher speeds. Upgrading to **disc brakes** (aftermarket) is recommended but adds complexity.

5. **Fuel System Problems** **Carburetors (Pike or Mikuni)** can clog, leak, or lose adjustment over time. A **full carburetor rebuild or replacement** may be necessary.

6. **Tires Are Worn** Original **knobby tires** (if still attached) will be **hard, cracked, or bald**. Replacing them is a **must** for safety, but modern **dual-sport tires** (e.g., **Michelin Wild Rider, Maxxis Minion**) can be expensive.

7. **Rust and Corrosion** If stored improperly, the **frame, swingarm, and exhaust** can rust through. A **full rust treatment and repainting** may be required.

8. **Limited Modern Comfort** The **hard seat, minimal wind protection, and no ergonomic refinements** make long rides uncomfortable compared to modern bikes. The **no-hands steering** is fun but not ideal for highway use.

9. **Resale Value is Low** Unlike some classic motorcycles (e.g., Honda CB750, Kawasaki Z1), these bikes **do not hold value**. A well-maintained example might fetch **$1,500 $3,000**, but most sell for **$800 $1,500** depending on condition.

10. **Legal and Safety Concerns** Some jurisdictions have **obsolete safety standards** (e.g., no turn signals, weak brakes). You may need to **modify or register** the bike as a "historical" or "experimental" vehicle, which can be bureaucratic.

11. **CDI Ignition Limitations** While the **3A3-85540-20-00 CDI igniter** improves reliability over points, it s **not bulletproof**. Over time, you may still face:

- **Failed capacitors or coils**

- **Wiring issues** (especially if original wiring is degraded)

- **Compatibility problems** (some bikes need additional modifications for smooth operation)

12. **No Modern Safety Features** **No ABS, traction control, or advanced braking systems** mean **longer stopping distances** and **less control in emergencies**.

---

### **Conclusion**

- **Enjoys mechanical work** and doesn t mind **restoration efforts**.

- **Values nostalgia and simplicity** over modern convenience.

- **Plans to use it for light trail riding, commuting, or as a weekend project**.

- **Has access to parts and tools** (or is willing to learn).

However, it s **not a plug-and-play bike** expect to **spend $1,000 $3,000 ** on repairs and upgrades before it s **fully reliable and safe**. If you want a **ready-to-ride adventure bike**, a **used modern dual-sport (e.g., Honda CRF300L, Yamaha TW200, KTM 390 Adventure)** would be a smarter purchase.

If you re **committed to the project**, the CDI upgrade is a **good first step** to improve reliability, but be prepared for **further electrical and mechanical work** down the road.

---

### **Recommendation**

- **Start with a bike in better condition** (e.g., a **1990s 2000s DT250/400**) that requires fewer major overhauls.

- **Consider a used modern dual-sport** if you want **immediate usability**.

- **Buy the DT80/DT100/GT80 with the CDI upgrade** as a **long-term project**.

- **Full suspension rebuild** (forks and rear shock).

- **Brake overhaul** (drums or disc conversion).

- **Carburetor rebuild or replacement**.

- **Tire and tube replacement**.

- **Rust treatment and repainting**.

- **Test the CDI system thoroughly** check for **proper spark, no misfires, and smooth idling**.

- **Look for a later-model Yamaha (e.g., DT250X 1990s) or a well-maintained classic** that s closer to **fully functional** without requiring a full rebuild.

- **Allocate at least $2,000 $3,000** for a **full restoration** (parts labor).

- **Factor in storage space** these bikes need **dry, sheltered storage** to prevent rust.

This bike is a **fantastic project** for the right owner, but **not a "buy now and ride" machine**. If you re willing to **put in the work**, it can become a **reliable, fun, and unique** dual-sport. If you want **something ready to ride today**, consider a **modern or slightly newer classic** instead.

Details:

OEM CDI IGNITER FOR 1978 1983 YAMAHA DT80 DT100 80 3A3-85540-20-00 USED PART IN GOOD CONDITION.

part #: 41g85540m0 prices

• $34.99-$80.00

specifications cyclevintagee:

• for models: Dt80, Dt100, Gt80
• for makes: Yamaha
• for years: 1978-1983
• mpn: 41g-85540-m0
• part type: Igniter
• non-domestic product: No
• machine type: Cdi
• color: Black
• compatible model: V80 Rxs Rx125, Dt100, Dt80, Dt 80, Dt 100, Gt80, Gt 80
• material: Plastic
• vintage part: Yes
• placement on vehicle: Front, Left, Right
• oe/oem part number: 3a3-85540-20-00
• compatible year: 1982, 1983, 1978, 1979, 1980, 1981
• country of origin: Japan

offer cyclevintagee:

• options: Ship-to-home
• best offers: True
• availability: In Stock
• sold: 0
• started: March 20, 2026
• quantity: 1

seller cyclevintagee:

• # reviews: 154
• city: Cherokee, Oklahoma
• rating: 98.7%

returns cyclevintagee:

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

payments cyclevintagee:

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

shipping cyclevintagee:

• class: Standard
• cost: $5.45
• service: USPS Ground Advantage
• carrier: USPS
• transit: 4-10 Days
• type: Calculated

general cyclevintagee:

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

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