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  3. WPS N100.604-105

WPS N100.604-105 Mikuni Jet

fits model: Ttr125e. make: Yamaha. year: 2003–2009.

N100.604-105 Wps Mikuni Main Jet 105 For Yamaha Ttr125e 2003-2009

( Brand: Wps ), ( Manufacturer Part Number: N100.604-105 ), ( Part Type: Jet ), ( Country Of Origin: Us ), ( Oe/oem Part Number: N100.604-105 4/pk5cff-2cc13b ), ( Item Length: 0.400 )

Review WPS Mikuni Main Jet 105 Yamaha fits TTR125E 2003–2009

The **Mikuni Jet 105** (part number **N100.604-105**) is a high-performance, precision-engineered carburetor designed specifically for Yamaha s **TTR125E** dual-sport motorcycles produced between **2003 and 2009**. This aftermarket upgrade stands out as a superior alternative to the stock carburetor, delivering enhanced throttle response, improved fuel efficiency, and a more refined power delivery across the entire RPM range. Crafted with Mikuni s signature attention to detail, the Jet 105 features a **105mm venturi**, a critical component that optimizes airflow while maintaining a balanced air-fuel mixture for smoother acceleration and better low-end torque. The carburetor s **aluminum body** ensures durability and resistance to corrosion, even under demanding riding conditions, while its **precision-machined internals** including the float bowl, jet needles, and throttle valve are engineered to minimize internal wear and maximize longevity. Unlike stock carburetors that may struggle with modern fuel standards or suffer from clogging, the Jet 105 incorporates **modernized jet sizes and fuel delivery systems** that adapt seamlessly to contemporary gasoline, reducing the risk of hesitation or lean-running issues. Whether tackling twisty backroads, cruising on highways, or navigating off-road trails, this carburetor provides a noticeable upgrade in **smoothness, power, and reliability**, making it an ideal choice for riders seeking to extract more performance from their TTR125E without compromising drivability. Installation is straightforward, thanks to Mikuni s compatibility with the stock mounting points, and the carburetor s **adjustable throttle stop** allows for fine-tuning to match individual riding preferences. For enthusiasts looking to restore their bike s performance to factory specs or push it beyond stock limits, the Mikuni Jet 105 delivers a **cost-effective, high-quality solution** that elevates both the riding experience and the motorcycle s overall functionality.

### Pros and Cons of buying a Mikuni Jet 105 for a Yamaha TTR125E (2003 2009)

#### **Pros:**

1. **Improved Performance** The Mikuni Jet 105 is a high-performance carburetor designed for better throttle response, smoother power delivery, and enhanced acceleration compared to the stock Mikuni VM28SS or VM28SSA. It is tuned for higher RPM and can make the TTR125E feel more responsive, especially in sportier riding conditions.

2. **Better Fuel Efficiency (Under Certain Conditions)** While fuel economy may not improve significantly in city driving, the Jet 105 s optimized airflow can help maintain better throttle control, reducing unnecessary fuel waste from rich mixtures or stumbling under acceleration.

3. **Easier to Tune** The Jet 105 has a more straightforward adjustment process compared to some older Mikuni models. The pilot and main jets are easier to access and replace, allowing for finer tuning of power delivery and idle stability.

4. **Durability and Reliability** Mikuni carburetors are known for their robust construction and longevity, especially when properly maintained. The Jet 105 is built to handle higher stress levels, making it a durable upgrade for a dual-sport bike like the TTR125E.

5. **Aftermarket Support** The Jet 105 is a popular carburetor among off-road and dual-sport enthusiasts, meaning there is a wide availability of replacement parts, tuning guides, and community support for troubleshooting.

6. **Enhanced Throttle Response in Off-Road Conditions** For riders who frequently take the TTR125E off-road, the Jet 105 provides a more aggressive power curve, which can be beneficial for trail riding where quick acceleration is needed.

7. **Compatibility with Modifications** If you plan to add other performance upgrades (such as a downpipe, exhaust, or clutch kit), the Jet 105 will complement those modifications better than the stock carburetor.

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#### **Cons:**

1. **Potential for Rough Idle or Tuning Challenges** The Jet 105 is tuned for higher RPM and may require careful adjustment to avoid a rough idle, especially in stock form. Some riders report needing to tweak the idle mixture screw or even replace the pilot jet to achieve a smooth idle.

2. **Higher Emissions Concerns (If Not Tuned Properly)** The TTR125E is equipped with an emissions system, and modifying the carburetor without proper tuning can lead to check engine lights or failure in regions with strict emissions regulations. A tune (preferably from a professional) may be necessary to compensate for the increased airflow.

3. **Cost of Installation and Tuning** While the Jet 105 itself is not extremely expensive, installing it may require additional parts (such as a new air filter, gasket, or even a new throttle body) and professional tuning to optimize performance. This adds to the overall cost compared to a simple carburetor swap.

4. **Potential for Overpowering the Stock Engine** The TTR125E s engine is not built for extreme power levels. While the Jet 105 is not a drastic upgrade, pushing it too hard without supporting modifications (such as a stronger clutch or upgraded transmission) could lead to premature wear on the drivetrain.

5. **Learning Curve for New Riders** If you are not familiar with carburetor tuning, the Jet 105 may require some experimentation to dial in the perfect settings. This could be frustrating for beginners who prefer plug-and-play upgrades.

6. **Risk of Voiding Warranty (If Applicable)** If your TTR125E is still under warranty, modifying the carburetor could void coverage, especially if emissions-related issues arise.

7. **Not a Guaranteed Fuel Economy Boost** While the Jet 105 improves throttle response, it does not necessarily improve fuel efficiency in real-world conditions. In fact, some riders report slightly worse mileage due to the carburetor s aggressive tuning.

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### **Conclusion:**

The Mikuni Jet 105 is a solid upgrade for the Yamaha TTR125E (2003 2009), offering noticeable improvements in throttle response, power delivery, and tunability. It is particularly well-suited for riders who want a more engaging riding experience, whether on-road or off-road, and are willing to put in the effort to tune it properly.

However, it is not a simple drop-in replacement it requires careful adjustment to avoid rough idling or emissions issues. If you are not comfortable with carburetor tuning or do not want to deal with potential tuning headaches, this upgrade may not be the best choice.

For riders who prioritize performance over simplicity and are prepared to invest time in tuning (or hiring a professional to do so), the Jet 105 is a worthwhile upgrade. For those who prefer a hassle-free experience or are concerned about emissions compliance, a less aggressive carburetor (such as a slightly modified stock VM28SS) or an electronic fuel injection (EFI) kit might be a better alternative.

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### **Recommendation:** - **If you want a noticeable performance boost and are willing to tune the carburetor:**

- Purchase the **Mikuni Jet 105** and consider getting it professionally tuned to ensure optimal performance and emissions compliance.

- Pair it with a **high-quality air filter** (such as K&N or Mikuni s own filter) and monitor fuel economy closely.

- Be prepared to adjust the **pilot and main jets** if needed for smooth idling.

- **If you prefer a simpler upgrade with minimal tuning required:**

- Consider a **modified stock VM28SS carburetor** (with slightly larger jets) or a **rebuilt stock carburetor** for a more straightforward improvement.

- If you are open to more advanced modifications, explore **EFI kits** (such as the **Yamaha TTR125 EFI conversion**) for a more modern and reliable solution.

- **If you ride primarily on-road and want better fuel efficiency:**

- Stick with the stock carburetor or a **lightly modified version** the Jet 105 s aggressive tuning may not be ideal for daily commuting.

Ultimately, the Jet 105 is a great choice for performance-oriented riders, but it demands attention to detail. Always weigh the benefits against your riding style and technical comfort level before making the upgrade.

Details:

Specifications: Brand: Mikuni, MPN: N100.604-105 4/PK, Jet Size: 105, Item length : 0.4 Quantity: Dimensions Shown In Images: Approx. Features: Genuine Mikuni brand replacement part. Untitled Document.

Single unit listing: 1 main jet. Ideal for carburetor tuning and maintenance. Use the photos to verify shape and size before purchase. Precision-machined brass construction.

Menu Mikuni N100.604-105 Main Jet 105 For Yamaha TTR125E 2003 -2009: 105: This main jet is a quality replacement fuel system component designed for precise carburetor tuning. Main jet size: 105.

specifications intakefuelmotorcycle:

  • for models: Ttr125e
  • for makes: Yamaha
  • for years: 2003-2009
  • brand: Wps
  • mpn: N100.604-105
  • part type: Jet
  • country of origin: Us
  • oe/oem part number: N100.604-105 4/pk5cff-2cc13b
  • item length: 0.400

shipping intakefuelmotorcycle:

  • cost: $0.00
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  • started: April 6, 2026
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  • Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

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for models: ttr125e, for makes: yamaha, for years: 2003-2009, part type: jet, country of origin: us, oe/oem part number: n100.604-105 4/pk5cff-2cc13b, item length: 0.400,
category: motorcycle parts > motorcycle scooter parts accessories > air intake fuel delivery, sku: 23337424441980723,
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