The Mikuni VM28-49 is a 28mm carburetor from Mikuni's VM Series, which is renowned for its high-quality, universal round-slide carburetors. Mikuni is a Japanese company with a long-standing reputation for producing reliable and performance-oriented carburetion systems for motorcycles, ATVs, and other small engines.

The Mikuni VM28-49 VM Series 28mm Universal Round Slide Carburetor is a trusted choice for powersports enthusiasts seeking top-tier performance. Designed with a spigot-style mounting and round slide configuration, this carburetor ensures optimal flow characteristics and smooth power delivery. It is perfect for a wide range of tuning needs, offering compatibility with genuine Mikuni jets and parts for peak performance.

Key Features:

• High Performance: The most popular choice in powersports for its reliability and power.
• Round Slide Design: Provides excellent flow characteristics and fuel atomization.
• Tuning Flexibility: Wide range of tuning components available for precise adjustments.
• Genuine Mikuni Quality: Made in Japan for unmatched durability and performance.

Specifications:

• Carburetor Size: 28mm
• Main Jet: 200 (4/042)
• Pilot Jet: 60 (VM22/210)
• Needle Jet: N-8 (169 Series)
• Needle: 5F21
• Slide Cutaway: 2.5 (VM28/56)
• Needle Valve: 2.5 (VM26/26)
• Air Jet: 0.5 (BS30/97)
• Spigot Mounting OD: 35mm
• Air Cleaner Side OD: 44mm

Included Items:

• (1) Mikuni VM28-49 Carburetor
• Manual

Unlock the full potential of your engine with the Mikuni VM28-49, delivering smooth acceleration and consistent performance. Ideal for custom builds and replacements—achieve the perfect tune with genuine Mikuni quality.

Overview of the Mikuni VM28-49 Carburetor

• Type: Universal round-slide carburetor
• Bore Size: 28mm
• Model Number: VM28-49
• Series: VM Series

Key Features

1. Round-Slide Throttle Valve: The round-slide design offers precise throttle control and smooth operation across the entire RPM range.

2. Large Selection of Tuning Components: Mikuni provides a wide array of jets, needles, and other tuning parts, allowing for fine-tuning to match specific engine requirements.

3. Universal Application: Designed to be adaptable to a variety of engines, making it suitable for custom projects or as an upgrade for older motorcycles.

4. Durable Construction: Made with high-quality materials to ensure longevity and reliability under various operating conditions.

5. Easy Maintenance: The carburetor's design allows for straightforward disassembly and cleaning, which is essential for maintaining optimal performance.

Specifications

• Venturi Size: 28mm
• Spigot Mounting Dimensions:
  • Engine Side Outer Diameter: Approximately 35mm (verify exact measurement for compatibility)
  • Air Filter Side Outer Diameter: Approximately 49mm
• Fuel Inlet: Single fuel inlet fitting
• Idle Adjustment: External idle screw for easy idle speed adjustments
• Air Adjustment: External air screw for fine-tuning the air-fuel mixture at idle and low speeds
• Choke Type: Manual lever choke for easy starting in cold conditions

Applications

The Mikuni VM28-49 carburetor is commonly used in:

• Vintage Snowmobiles and Motorcycles: Popular among classic bike enthusiasts as an upgrade or replacement for original equipment manufacturer (OEM) carburetors.
• Off-Road Bikes and ATVs: Suitable for single-cylinder and twin-cylinder engines commonly found in dirt bikes and all-terrain vehicles.
• Custom Engine Builds: Favored in custom projects where a reliable and tunable carburetor is required.

Benefits of Using the Mikuni VM28-49

• Improved Throttle Response: The precise metering of fuel enhances engine responsiveness.
• Enhanced Performance: Optimizing the air-fuel mixture can lead to better engine efficiency and power output.
• Reliability: Mikuni's reputation for quality ensures consistent performance over time.
• Ease of Tuning: Accessible adjustment screws and a wide range of available jets make tuning straightforward.

Installation Considerations

• Compatibility: Verify that the carburetor's dimensions match the intake manifold and air filter connections of your engine.
• Jetting: Out-of-the-box jetting may not be perfect for all engines. It's important to adjust the main jet, pilot jet, needle jet, and air screw to suit your specific engine and operating conditions.
• Throttle Cable: You may need a compatible throttle cable or make adjustments to fit your existing setup.
• Choke Mechanism: Ensure that the manual choke lever is accessible and functional after installation.

Tuning and Maintenance

• Initial Setup: Begin with the factory-recommended settings, then adjust as necessary based on engine performance.
• Regular Cleaning: Periodically disassemble and clean the carburetor to prevent blockages from debris or varnish buildup.
• Float Level Adjustment: Ensure the float height is set correctly to maintain proper fuel levels within the carburetor bowl.

Availability of Parts

One of the advantages of using a Mikuni carburetor is the availability of replacement parts and tuning components. Mikuni offers an extensive catalog of parts, making it easier to maintain and customize the carburetor to your needs.

Conclusion

The Mikuni VM28-49 VM Series 28mm Universal Round Slide Carburetor is a versatile and reliable option for a wide range of small engine applications. Its ease of tuning, combined with Mikuni's quality construction, makes it a popular choice among enthusiasts looking to enhance engine performance and reliability.