WSM 26309-W365138-29 Mikuni Carburetor Rebuild Kit 38/44/46MM
fits model: Gp1200. make: Yamaha. year: 1997–1999.
( Brand: Wsm ), ( Manufacturer Part Number: 26309-W365138-29 ), ( Part Type: Carburetor )
Review WSM Mikuni 38/44/46mm Carburetor Rebuild Kit Yamaha fits GP1200 1997–1999
The **WSM 26309-W365138-29 Mikuni 38/44/46mm Carburetor Rebuild Kit** is a meticulously engineered solution designed to restore peak performance and reliability to the high-performance **Mikuni BS38/BS44/BS46** carburetors found in the **1997 1999 Yamaha GP1200RR**, a legendary sportbike renowned for its aggressive handling and exhilarating power delivery. This premium rebuild kit is crafted to address the wear and tear of high-revving racing applications, ensuring a flawless throttle response, optimal fuel-air mixture, and long-term durability critical factors for both track use and spirited street riding. The kit includes a comprehensive selection of **OEM-quality replacement parts**, including precision-machined **needles, jets, gaskets, and seals**, all sourced from Mikuni s trusted manufacturing facilities to maintain the original performance characteristics of the carburetor. The **38mm pilot needle** and **44/46mm main jets** are designed to fine-tune the bike s throttle response, whether you re seeking a snappy low-end or a razor-sharp high-revving top end, making it an ideal choice for riders who demand both precision and power. Each component is engineered to exacting tolerances, ensuring a perfect fit with the GP1200 s fuel delivery system while minimizing the risk of leaks, clogs, or inconsistent fuel flow common issues that can plague aging carburetors. Whether you re preparing the bike for a track day, a long-distance adventure, or simply restoring it to its factory-spec performance, this rebuild kit provides the tools necessary to achieve a **clean, efficient, and high-performing** carburetor setup. With its emphasis on **durability and performance**, this kit is not just a maintenance solution but a strategic upgrade for any serious rider looking to maximize the GP1200 s legendary capabilities.
The **WSM 26309-W365138-29 Mikuni 38/44/46mm carburetor rebuild kit** is a popular choice for rebuilding the stock Mikuni carburetors on a **1997 1999 Yamaha GP1200RR**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.
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### **Pros of the WSM Rebuild Kit**
1. **High-Quality Components** The kit includes genuine Mikuni parts, including jets, gaskets, seals, and a new diaphragm, ensuring reliable performance and longevity. The use of OEM-specification components reduces the risk of compatibility issues.
2. **Comprehensive Rebuild** The kit covers all critical parts needed for a full rebuild, including:- **Pilot and main jets** (38/44/46mm specific)
- **Needle and seat assemblies**
- **Diaphragm and springs**
- **Gaskets and seals** (including the carburetor-to-intake gasket)
- **Cleaning solvents and brushes** (some kits include these)
This eliminates the need to source individual parts separately.
3. **Improved Performance & Reliability** A properly rebuilt carburetor can restore or enhance throttle response, fuel efficiency, and power output. Over time, carburetors degrade due to carbon buildup, worn seals, and jet clogging, so a rebuild addresses these issues.
4. **Cost-Effective Alternative to Replacement** While a new Mikuni carburetor (OEM or aftermarket) can cost **$300 $600**, a rebuild kit typically ranges from **$80 $150**, making it a budget-friendly solution for restoring stock performance without upgrading.
5. **Ease of Installation** The GP1200 s Mikuni carburetors are relatively straightforward to rebuild, especially for mechanics with some experience. The kit provides clear instructions, and the process (if done carefully) takes **2 4 hours** per carburetor.
6. **Maintains Stock Tuning** If you prefer keeping the bike stock or close to stock, a rebuild allows you to avoid the need for aftermarket carburetors (e.g., Keihin or Mikuni performance models), which may require additional tuning.
7. **Prevents Future Issues** Neglecting carburetor maintenance can lead to **flooding, lean running, or complete failure**. A rebuild extends the life of the carburetors and prevents costly engine damage from poor fuel delivery.
8. **Available from Reputable Brands** WSM (World Sport Motors) is a well-regarded aftermarket parts supplier with a history of producing reliable rebuild kits. The kit is also widely available through Yamaha dealers, online retailers (e.g., Amazon, RockAuto), and specialty motorcycle parts stores.
9. **No Major Modifications Required** Unlike upgrading to a larger carburetor or performance model, a rebuild keeps the bike s original setup intact, simplifying future maintenance and reducing the risk of compatibility problems with other components (e.g., exhaust, ECU).
10. **DIY-Friendly** While some mechanics prefer professional rebuilds, the GP1200 s carburetors are accessible and forgiving for experienced DIYers. The kit includes most tools needed (or at least lists them), and there are numerous online guides (e.g., YouTube tutorials) to assist.
---
### **Cons of the WSM Rebuild Kit**
1. **Labor-Intensive Process** Rebuilding carburetors requires **disassembly, cleaning, inspection, and reassembly**, which can be time-consuming. If you re not comfortable with detailed mechanical work, you may need to pay a mechanic, adding to the cost.
2. **Risk of Mistakes** Improper reassembly (e.g., incorrect jet sizes, misaligned needles, or improper gasket seating) can lead to **poor performance, flooding, or even engine damage**. This is more critical if you re not experienced with carburetors.
3. **No Performance Gains Without Tuning** A rebuild alone does **not** improve power or throttle response beyond restoring stock function. If you want more power, you ll need to adjust jets (often requiring a **jet kit** or **tuning session**) or consider upgrading to a performance carburetor.
4. **Wear on Other Components** If the carburetors were neglected for a long time, other parts (e.g., intake manifold, throttle bodies, or even the engine) may be affected by carbon buildup or fuel system issues. A rebuild may expose these problems, requiring additional work.
5. **Depends on Original Condition** If the carburetors are **severely worn, cracked, or corroded**, a rebuild kit may not be sufficient. In such cases, replacing the carburetors entirely is safer. Signs of severe wear include:
- **Hard-to-start issues**
- **Visible cracks in the body**
- **Excessive play in the throttle linkage**
- **Leaking seals or gaskets**
6. **Limited Longevity Without Maintenance** Even after a rebuild, carburetors will eventually need another rebuild or replacement, especially if the bike is ridden hard or in dusty/gritty conditions. The average lifespan of a Mikuni carburetor with proper maintenance is **50,000 100,000 miles**.
7. **Potential for Counterfeit Kits** While WSM is reputable, some third-party sellers may offer **fake or low-quality rebuild kits**. Always purchase from **authorized dealers or trusted online retailers** to ensure authenticity.
8. **No Upgrade Path** If you later decide to modify the bike (e.g., for track use or increased power), a stock-rebuilt carburetor may become a bottleneck. Upgrading to a **Keihin RC32 or Mikuni RS carburetor** would require additional tuning and possibly ECU flashing.
9. **Environmental Factors** If you ride in **dusty, humid, or polluted areas**, carburetors may clog or corrode faster, reducing the effectiveness of the rebuild. More frequent maintenance may be required.
10. **Learning Curve for Tuning** Even after rebuilding, you may need to **adjust jets** to match your riding conditions (e.g., altitude, fuel type). This requires some experimentation and understanding of carburetor tuning principles.
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### **Conclusion**
The **WSM Mikuni 38/44/46mm rebuild kit** is an **excellent choice** for restoring your **1997 1999 Yamaha GP1200RR s stock carburetors** if they are still structurally sound. It offers a **cost-effective, high-quality solution** for improving reliability, throttle response, and fuel efficiency without major modifications. However, it is **not a performance upgrade** it simply returns the carburetors to their original specifications.
The decision to use this kit depends on your **mechanical skills, budget, and goals**:- **If your carburetors are worn but not damaged**, a rebuild is a **smart investment** that extends their life and improves performance.
- **If you re inexperienced with carburetors**, consider hiring a mechanic or practicing on a less critical bike first.
- **If you plan to modify the bike for more power**, a rebuild may not be enough you ll eventually need to upgrade to a performance carburetor.
- **If the carburetors are cracked or severely corroded**, replacement is the safer option.
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### **Final Recommendation**
**Buy the WSM rebuild kit if:**You want to **restore stock performance** without upgrading.
Your carburetors are **functioning but dirty or worn**.
You re **comfortable with mechanical work** or willing to pay for professional help.
You re on a **budget** and want to avoid the cost of new carburetors.
You plan to **keep the bike stock or lightly modified**.
**Avoid the rebuild kit if:**Your carburetors are **cracked, leaking severely, or beyond repair**.
You re **not mechanically inclined** and don t want to risk mistakes.
You **prioritize performance gains** over stock restoration (in which case, consider a **Keihin RC32 or Mikuni RS carburetor**).
You **neglected maintenance for years**, and other fuel system issues (e.g., clogged jets, bad fuel pump) need addressing first.
**Best Approach:**1. **Inspect the carburetors** Check for cracks, leaks, and excessive wear.
2. **Clean the existing carburetors** Sometimes, a **deep cleaning** (without a full rebuild) can restore function.
3. **Rebuild if necessary** If parts are worn, use the WSM kit for a **complete overhaul**.
4. **Adjust jets if needed** After rebuilding, test and fine-tune with a **jet kit** for optimal performance.
5. **Consider a performance upgrade later** If you want more power, research **Keihin RC32 or Mikuni RS carburetors** and ECU tuning.
For most **street-riding GP1200 owners**, the WSM rebuild kit is a **practical and cost-effective solution** that balances **reliability, ease of installation, and performance restoration**. If you re unsure, consult
Details:
Brand: WSM, model Number: 26309-W365138-29. Parts without fitment are to be assumed universal and may require vehicle modification. This is helpful if you are buying multiple items. Compatibility: Years: Make: model: Application: Notes: 1994 - 1995 Polaris SLT 750These model's have an external fuel pump, the pump components in rebuilt kits listed will not work.
I need to exchange an item. WSM Mikuni 38/44/46mm Carburetor Rebuild Kit for 1997 1999 Yamaha GP1200 Wave Runner Jet Ski: Kit, Contains: one kit to rebuild a single carb, Actual Contents May Vary From Photo, Does not contain parts model's with external fuel pumps, Square Pump Aftermarket 38/40, Needle and seats sold separately. 1992 - 1997 Sea-Digits, 1997 1998 Pro 785, 1998 Sea-Dogs, 2003 2011 KawasakiJS800 800 SX-R, 1996 KawasakiJS750 750SXi, 1993 1995 Polaris SL 750These model's have an external fuel pump, the pump components in rebuilt kits listed will not work.
part #: 26309w36513829 price
- $65.73
specifications jetskiintakeez:
- for models: Gp1200
- for makes: Yamaha
- for years: 1997-1999
- brand: Wsm
- mpn: 26309-w365138-29
- part type: Carburetor
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