KEIHIN Carburetor Carb 386902991928

( Brand: Keihin ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Machine Type: Off-road Motorcycle ), ( UPC: 386902991928 )

Review KEIHIN Yamaha Oem Carburetor Carb fits YZ450F 2006–2009

Introducing the Keihin FCR MX38 flat slide carburetor, a high-performance component that was specifically designed for use on the 2006-2009 Yamaha YZ450F motorcycle models produced in 2008. This carburetor is a replacement part for the original equipment, ensuring a perfect fit and optimal engine performance.

The FCR MX38 carburetor is renowned for its advanced design and precise fuel delivery, making it a popular choice among off-road racing enthusiasts. The flat slide design allows for a smoother power delivery and improved throttle response, enhancing the overall riding experience. The carburetor features a 38mm throttle bore size, which is larger than the standard 36mm size, allowing for increased air and fuel flow.

The Keihin FCR MX38 is equipped with a fine-tuned jetting system, which can be easily adjusted to meet the specific requirements of different riding conditions and altitudes. The carburetor comes with four main jets (#110, #120, #130, and #140), two pilot jets (#40 and #45), and one needle jet (#58). The pilot jet and needle jet are adjustable, providing the ability to fine-tune the carburetor for optimal fuel-air mixture.

The carburetor body is made from high-quality aluminum, ensuring lightweight and durability. The needle and jet kit are made from stainless steel, making them resistant to corrosion and wear. The O-ring seals are made from a high-temperature resistant material, ensuring a leak-free operation even in the most demanding riding conditions.

The installation of the Keihin FCR MX38 carburetor is a relatively straightforward process, but it may require the assistance of a professional mechanic to ensure proper setup and adjustment. The carburetor comes with a detailed instruction manual and all necessary hardware for installation.

In summary, the Keihin FCR MX38 flat slide carburetor is a high-performance replacement component for the Yamaha YZ450F motorcycle models produced in 2008. Its advanced design, precise fuel delivery, and adjustable jetting system make it an ideal choice for off-road racing enthusiasts looking to improve their engine performance and riding experience.

The Keihin FCR M5T Carburetor (Part Number: 386902991928) is a popular choice among Yamaha YZ450F riders for years 2006-2009 (2008 model). This carburetor is known for its ability to deliver optimal engine performance through precise fuel-air mixture adjustments. Let's discuss some pros and cons to help you make an informed decision.

1. Improved Power and Response: Upgrading to this Keihin carburetor can lead to increased horsepower and torque, resulting in improved throttle response and overall performance.

2. Enhanced Fuel Economy: A properly tuned carburetor can help improve fuel economy by ensuring the engine receives the correct fuel-air mixture, reducing fuel waste.

3. Easy Tuning: The Keihin FCR M5T is known for its ease of tuning, allowing riders to adjust the carburetor settings to suit their riding style or track conditions.

4. High-Quality Construction: Keihin carburetors are renowned for their durability and high-quality construction, ensuring long-lasting performance.

1. Complexity: Carburetors can be more complex than modern fuel injection systems, requiring more time and effort for tuning and maintenance.

2. Sensitivity to Environmental Factors: Carburetors are sensitive to changes in temperature, altitude, and air pressure, which may require frequent adjustments to maintain optimal performance.

3. Potential for Leaks: Carburetors have numerous gaskets and seals, increasing the likelihood of leaks if not properly maintained.

The Keihin FCR M5T Carburetor (Part Number: 386902991928) is an excellent choice for riders seeking improved power, response, and fuel economy on their Yamaha YZ450F (2006-2009, 2008 model). However, it comes with the complexity and sensitivity that is inherent to carburetors. If you are willing to put in the time and effort for tuning and maintenance, this upgrade can lead to significant performance improvements.

If you decide to purchase the Keihin FCR M5T Carburetor, I would recommend working with a professional tuner or following a trusted tuning guide to ensure proper setup and tuning. Regular maintenance, such as checking and adjusting the float levels, needle jet, and main jet, is crucial for long-term performance and reliability.

part # 386902991928 price

• $200.00

specifications iodacarb:

• for models: Yz450f
• for makes: Yamaha
• for years: 2006-2009
• brand: Keihin
• choke type: Mechanical
• type: Carburetor
• machine type: Off-road Motorcycle
• upc: 386902991928

seller iodacarb:

• rating: 100.0%
• # reviews: 147

offer iodacarb:

• availability: In Stock
• started: September 17, 2025
• sold: 0
• options: Ship-to-home
• quantity: 1

returns iodacarb:

• policy: No Returns

shipping iodacarb:

• cost: $22.68
• transit: 3-9 Days
• class: Economy
• carrier: FedEx
• type: Calculated
• service: FedEx Ground Economy

payments iodacarb:

• wallet: Apple-pay
• other
• credit card: Diners-club

general iodacarb:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Carburetors
• condition: Used

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