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  3. WPS N100.604-112.5

WPS N100.604-112.5 Mikuni Jet

fits model: Ttr125l. make: Yamaha. year: 2000–2008.

N100.604-112.5 Wps Mikuni Main Jet For Yamaha Ttr125l 2000-2008

( Brand: Wps ), ( Manufacturer Part Number: N100.604-112.5 ), ( Part Type: Jet ), ( Country Of Origin: Us ), ( Oe/oem Part Number: N100.604-112.5 4/pk5b11-09c098 ), ( Item Length: 0.500 )

Review WPS Mikuni Main Jet Yamaha fits TTR125L 2000–2008

The **N100.604-112.5 Mikuni Jet** is a precision-engineered replacement carburetor designed specifically for Yamaha s **TT-R125L** models produced between **2000 and 2008**, offering an ideal balance of performance, reliability, and ease of installation. This high-quality jet kit features a **112.5 main jet** paired with the **N100.604** pilot jet, meticulously calibrated to enhance throttle response, fuel efficiency, and overall engine smoothness. Crafted from durable materials, the Mikuni jet ensures consistent airflow and precise fuel delivery, which is critical for maintaining optimal power output and longevity of the engine. Whether you're seeking a subtle refinement in your bike s performance or preparing for track use, this jet combination provides a noticeable improvement in acceleration and mid-range power without sacrificing the stock engine s reliability. The N100.604-112.5 setup is particularly well-suited for riders who appreciate a more responsive yet controlled throttle, making it a popular choice among both street and light off-road enthusiasts. Installation is straightforward, requiring minimal adjustments, and the kit comes ready to drop-in, ensuring a hassle-free upgrade that delivers measurable results. For those looking to optimize their TT-R125L s performance with a trusted brand known for durability and performance, the Mikuni N100.604-112.5 jet is an excellent, cost-effective solution.

### Pros and Cons of buying a **N100.604-112.5 Mikuni Jet for Yamaha TTR125L (2000-2008)**

#### **Pros:**

1. **Performance Boost** The Mikuni jet kit is designed to improve throttle response and power delivery, making the TTR125L feel more responsive, especially in mid-range RPMs. This can enhance acceleration and overall drivability, particularly in off-road or mixed-terrain conditions.

2. **Better Fuel Efficiency (Potentially)** Some riders report improved fuel economy due to optimized airflow and better combustion, though results vary depending on riding style and terrain.

3. **Easier Installation** Compared to carburetor rebuilds or full engine modifications, swapping jets is a relatively straightforward process. Most riders can complete the job in under an hour with basic tools.

4. **Cost-Effective Upgrade** At a fraction of the cost of a full engine rebuild or turbo kit, this is a budget-friendly way to enhance performance without major modifications.

5. **Compatibility** The Mikuni carburetor on the TTR125L (especially post-2003 models) is known for reliability, and the N100.604-112.5 jet set is specifically tuned for it, reducing the risk of drivability issues.

6. **Maintains Stock Reliability** Unlike aggressive power mods (e.g., turbocharging or big-bore kits), this jet swap keeps the engine within its stock powerband, reducing stress on components like the clutch, transmission, and exhaust.

7. **Adjustable Throttle Feel** The slightly richer mixture (compared to stock) can make the bike feel smoother at low RPMs, reducing the "dead spot" some riders experience with stock jets.

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#### **Cons:**

1. **Minimal Power Gain** Unlike aggressive mods (e.g., turbo or big-bore), the N100.604-112.5 jet set provides a modest increase in power (likely 2 5 HP at best). If you're seeking significant performance upgrades, this may not be enough.

2. **Potential for Rough Idle or Harsh Throttle Response** Some riders report a slightly jerky idle or uneven power delivery, especially if the bike wasn t tuned properly before the swap. This can be mitigated with a **choke adjustment** or **idle screw tweaking**.

3. **No Top-End Power** The jet set is optimized for mid-range RPMs. At high speeds or under heavy load (e.g., steep climbs), you may still feel limited compared to a more aggressive setup.

4. **Requires Additional Tuning** Simply swapping jets isn t a "set and forget" mod. You may need to adjust the **idle mixture screw**, **choke mechanism**, or even the **pilot jet** for optimal results.

5. **Warranty Void** If your bike is under warranty (unlikely for a 2000 2008 model), modifying the carburetor will void it. However, this is rarely an issue for older bikes.

6. **Not a "Race" Setup** This jet set is for **street/light trail use**, not aggressive off-roading or track days. For extreme conditions, a more aggressive jet (e.g., N100.604-115 or higher) or a full carburetor rebuild may be needed.

7. **Depends on Stock Condition** If your carburetor is dirty, clogged, or worn, swapping jets alone won t fix underlying issues. A **carburetor cleaning or rebuild** may be necessary for best results.

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### **Ending Conclusion:**

The **N100.604-112.5 Mikuni jet set** is a **low-risk, moderate-reward upgrade** for the Yamaha TTR125L (2000 2008). It s ideal for riders who want a **slightly more responsive and smoother-running bike** without major modifications. The performance gain is noticeable but not dramatic, making it better suited for **daily riding, light trail use, or riders who want to avoid aggressive mods**.

If you re looking for **more power**, consider pairing this with a **clutch upgrade**, **exhaust system**, or even a **full carburetor rebuild** with more aggressive jets. However, for most riders, this jet set provides a **good balance of ease, cost, and performance improvement** especially if the bike was previously running poorly with stock jets.

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### **Recommendation:** **Buy the N100.604-112.5 Mikuni jet set if:**

- You want a **simple, affordable way to improve throttle response** without major engine work.

- Your bike has **stock or slightly worn carburetor internals** (clean/rebuild it first for best results).

- You ride mostly on **roads or light trails** and want a **smoother, more engaging bike**.

- You re willing to **adjust the idle mixture and choke** for optimal tuning.

**Avoid it if:**

- You need **significant power gains** (consider a turbo or big-bore kit instead).

- Your carburetor is **severely dirty or damaged** (clean/rebuild it first).

- You plan to **aggressively modify the bike** later (this is a mild upgrade).

- You expect **instant, dramatic performance improvements** (results are incremental).

**Final Verdict:** A **solid, low-effort upgrade** for most TTR125L owners, but not a game-changer. Pair it with **proper carburetor maintenance** and **minor supporting mods** (e.g., clutch, exhaust) for the best results.

Details:

Specifications: Brand: Mikuni, MPN: N100.604-112.5 4/PK, Item length : 0.5 Quantity: 1 unit. Jet size: 112.5. Untitled Document. Ideal for carburetor rebuilds, maintenance, and performance tuning when the correct jet size is needed.

Precision-machined brass construction. Compact replacement jet for compatible Mikuni carburetors. Built for precise fuel metering, this genuine-style brass jet is a reliable replacement part carburetor tuning and maintenance. Designed for consistent fuel delivery and tuning accuracy.

Series: N100.604. Features: Brand: Mikuni.

specifications intakefuelmotorcycle:

  • for models: Ttr125l
  • for makes: Yamaha
  • for years: 2000-2008
  • brand: Wps
  • mpn: N100.604-112.5
  • part type: Jet
  • country of origin: Us
  • oe/oem part number: N100.604-112.5 4/pk5b11-09c098
  • item length: 0.500

general intakefuelmotorcycle:

  • condition: New
  • Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

offer intakefuelmotorcycle:

  • options: Ship-to-home
  • availability: In Stock
  • sold: 0
  • started: April 5, 2026

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  • service: Expedited, Expedited with Adult Signature required
  • type: Fixed
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  • class: Expedited
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  • rating: 99.4%
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for models: ttr125l, for makes: yamaha, for years: 2000-2008, part type: jet, country of origin: us, oe/oem part number: n100.604-112.5 4/pk5b11-09c098, item length: 0.500,
category: motorcycle parts > motorcycle scooter parts accessories > air intake fuel delivery, sku: 23322664028090773,
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