MIKUNI 7037-M326594-17 Carburetor Rebuild Kit 44MM

( Brand: Mikuni ), ( Manufacturer Part Number: 7037-M326594-17 ), ( Part Type: Carburetor )

Review MIKUNI Genuine Bn I series 44mm Carburetor Rebuild Kit Yamaha fits 2003–2005

The **Mikuni 7037-M326594-17 I-Series 44mm Carburetor Rebuild Kit** is a meticulously engineered solution designed to restore peak performance and longevity to the high-performance carburetors found in the 2003 2005 Yamaha YZF-R6, YZF-R1, and other sportbike models equipped with the I-Series 44mm carburetor setup. This premium rebuild kit is crafted with an unwavering commitment to precision, ensuring that every component from the finely machined jets and needles to the meticulously calibrated gaskets meets or exceeds OEM specifications. The kit includes a complete set of essential parts, including a new **pilot jet (M326594)**, a **main jet (M326594-17)**, a **needle and spring assembly**, a **throttle body**, **gaskets**, and **O-rings**, all sourced from Mikuni s trusted manufacturing facilities to guarantee consistent quality and reliability. Whether you're addressing a carburetor that has suffered from carbon buildup, wear from aggressive riding, or simply requires routine maintenance, this kit provides everything needed to perform a thorough disassembly, cleaning, and reassembly with confidence. The I-Series carburetor is renowned for its responsive throttle action and smooth power delivery, and this rebuild kit ensures that those characteristics remain intact, if not enhanced, through the use of high-grade materials and tight tolerances. For riders who demand performance without compromise, this kit is an indispensable tool for maintaining the optimal balance between throttle response, fuel efficiency, and engine protection. Properly rebuilt with this kit, the carburetor will not only restore the bike s original factory performance but also extend its service life, making it a cost-effective investment for both enthusiasts and professional mechanics alike.

The **Mikuni 7037-M326594-17 I-Series 44mm Carburetor Rebuild Kit** is a popular choice for rebuilding the stock Mikuni carburetors found on **2003 2005 Yamaha YZ250F/YZ450F** and other similar models. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Mikuni 7037-M326594-17 Rebuild Kit**

1. **OEM Compatibility**

The kit is designed specifically for the **I-Series 44mm carburetor** used on these Yamaha models, ensuring a direct replacement for the stock unit. This means all components (jets, gaskets, seals, and internals) are engineered to match the factory specifications, reducing the risk of compatibility issues.

2. **High-Quality Components**

- **Needle and jet sets** (pilot and main jets) that are pre-tuned for stock performance.

- **Diaphragms, seals, and gaskets** made from durable materials to prevent leaks and ensure proper sealing.

- **Clean, fresh internals** (throttle bodies, float bowls, etc.) that eliminate wear and carbon buildup from the original carb.

3. **Cost-Effective Solution**

Rebuilding the carburetor with this kit is **far cheaper** than purchasing a **new OEM or aftermarket carburetor** (which can cost $200 $400 ). A rebuild kit typically runs **$50 $100**, making it an attractive option for riders who want to restore stock performance without a full replacement.

4. **Improved Reliability and Performance**

Over time, carburetors accumulate **dirt, carbon deposits, and worn seals**, leading to **lean running, rough idle, or poor throttle response**. A proper rebuild cleans and replaces all critical parts, restoring **smooth operation, better fuel efficiency, and consistent power delivery**. Many riders report noticeable improvements in **idle stability, acceleration, and overall drivability** after a rebuild.

5. **Easy to Install (With Proper Preparation)**

While carburetor rebuilds require **some mechanical skill and patience**, the process is **straightforward if done methodically**. The kit includes **clear instructions**, and many riders complete the job in **2 4 hours** with basic tools. Yamaha s I-Series carbs are **simpler than some aftermarket designs**, making them more approachable for beginners.

6. **Prevents Long-Term Damage**

A neglected carburetor can lead to **engine damage** from **lean mixtures, carbon buildup, or fuel starvation**. Rebuilding it **extends the life of the engine** and prevents costly repairs down the line.

7. **Stock Performance Restoration**

If the bike was previously modified (e.g., with aftermarket carbs or aggressive tuning), a rebuild can **reset the carb to stock specs**, allowing for a **clean slate** if you later decide to tune or modify again.

8. **Widely Available Parts & Support**

Mikuni is a **long-standing brand**, and this kit is **easily found** at most **moto parts stores, online retailers (Amazon, J&P Cycles, Yamaha dealers), and motorcycle forums**. There is also **abundant online guidance** (YouTube tutorials, forum threads) for those unfamiliar with carburetor rebuilds.

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### **Cons of the Mikuni 7037-M326594-17 Rebuild Kit**

1. **Requires Disassembly & Cleaning**

Simply installing the new parts **won t fully restore performance** the **existing carburetor body must be cleaned thoroughly** to remove **carbon deposits, old fuel residue, and debris** from the jets, passages, and float bowl. Skipping this step can **nullify the benefits** of the rebuild.

2. **Potential for User Error**

- **Incorrect jet sizing** (using the wrong pilot or main jet).

- **Improper needle valve adjustment** (leading to a lean or rich mixture).

- **Overtightening seals or gaskets**, which can cause leaks.

- **Not checking float level**, resulting in fuel starvation.

These errors can **worsen performance** or even **damage the engine** if the carb runs too lean.

3. **Not a Permanent Fix for Underlying Issues**

If the **engine itself has problems** (e.g., **worn piston rings, bad ignition, or vacuum leaks**), the carburetor rebuild **won t fully resolve them**. The bike may still run poorly if other systems are failing.

4. **Time-Consuming for Beginners**

A proper rebuild takes **time and attention to detail**. Beginners may find it **frustrating** if they re not familiar with carburetor mechanics. Some riders prefer **pre-rebuilt or aftermarket carbs** (like **Walbro or Keihin**) if they want a **quick, hassle-free solution**.

5. **Limited Tuning Flexibility**

The kit provides **stock-spec jets and needles**, which are optimized for **stock engine performance**. If you plan to **modify the bike (e.g., add power, change exhaust, or tune the ECU)**, you may need to **adjust the carburetor further** after the rebuild, requiring additional knowledge.

6. **Risk of Contamination During Rebuild**

If the **carburetor body is not cleaned properly** (e.g., using the wrong solvent or not rinsing thoroughly), **old fuel deposits or debris** can remain, **clogging jets or passages** and **voiding the benefits** of the rebuild.

7. **Not Ideal for Heavy Modifications**

If the bike has **aggressive modifications** (e.g., **big bore kits, high-compression engines, or significant power increases**), the **stock I-Series carb may struggle** even after a rebuild. In such cases, an **aftermarket carb (e.g., Walbro 44mm or Keihin FCR)** may be necessary for proper fuel delivery.

8. **Gasket and Seal Wear Over Time**

Even with a new rebuild kit, **gaskets and seals degrade with age and heat**. Some riders report **leaks around the throttle body or base gasket** within **1 2 years**, requiring **additional maintenance**.

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### **Conclusion**

The **Mikuni 7037-M326594-17 I-Series 44mm Carburetor Rebuild Kit** is an **excellent choice** for riders who want to **restore stock performance, improve reliability, and avoid the cost of a new carburetor**. It is **cost-effective, high-quality, and widely compatible** with the 2003 2005 Yamaha YZ250F/YZ450F.

However, it **requires careful execution** proper cleaning, correct jet selection, and precise assembly are **essential** to avoid negating the benefits. Beginners may find the process **challenging**, but with **patience and the right resources**, it is a **rewarding DIY project**.

For riders who **prefer convenience over DIY work**, an **aftermarket carburetor (e.g., Walbro 44mm or Keihin FCR)** might be a better option, though it comes at a higher upfront cost. If the goal is **stock-like performance with minimal hassle**, the rebuild kit is **one of the best values available**.

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### **Final Recommendation**

You want to **restore stock performance** without spending money on a new carb.

You re **comfortable with basic mechanical work** and have time for a **meticulous rebuild**.

The bike has **no major engine issues** (e.g., compression, ignition, or vacuum leaks).

You plan to **keep the bike stock or make minor modifications** in the future.

You want a **cost-effective solution** that extends the life of your carburetor.

You **don t want to deal with a rebuild** and prefer a **plug-and-play solution**.

The bike has **aggressive modifications** that require **higher fuel flow**.

You **lack confidence** in properly cleaning and assembling the carburetor.

- **Use carburetor cleaner (e.g., CRC or Mikuni-specific solvent)** to thoroughly clean the carb body before reassembly.

- **Follow a trusted rebuild guide** (e.g., **Yamaha s service manual, Mikuni s instructions, or a detailed YouTube tutorial**).

- **Check float level** and **adjust needle position** for the best idle and throttle response.

- **Test the bike after reassembly** and **fine-tune the carb** if needed (e.g., adjusting idle screw, checking for leaks).

**Bottom Line:** For most **2003 2005 Yamaha YZ250F/Y

Details:

I need to exchange an item.: Brand: Mikuni, model Number: 7037-M326594-17. Mikuni Genuine BN I-Series 44mm Carburetor Rebuild Kit for 2003 - 2005 Yamaha GP800A Wave Runner GP800R Jet Ski: Kit, Contains: one kit to rebuild a single carb, Actual Contents May Vary From Photo, Carb Fits 44mm, Needle and seats sold separately. Compatibility: Years: Make: model: Application: Notes: 2000 - 2002 YamahaGP1200 Wave Runner GP12 2003 2005 YamahaGP800A GP800R, 2001 YamahaXA800 XL8 1998 1999 YamahaGP800 GP8 2002 2004 YamahaXA800A XLT8 2004 YamahaXA1200A XLT1200.

This is helpful if you are buying multiple items. Parts without fitment are to be assumed universal and may require vehicle modification.

part #: 7037m32659417 price

• $83.77

specifications jetskiintakeez:

• for makes: Yamaha
• for years: 2003-2005
• brand: Mikuni
• mpn: 7037-m326594-17
• part type: Carburetor

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• condition: New
• Parts Accessories > Personal Watercraft Parts > Intake Fuel Systems

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• started: April 11, 2026
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