1. Motorcycle Carburetors Offers
  2. sku: 11236046993092881
  3. MIKUNI MK-405

MIKUNI MK-405 Air Valve Rebuild Kit BSR33/42

Mk-405 Mikuni Bsr33/42 Air Cutoff Valve Rebuild Kit -

( Brand: Mikuni ), ( Country Of Origin: Japan ), ( Item Height: 0.75 ), ( Item Length: 8.00 ), ( Item Weight: 0.05 ), ( Item Width: 5.75 ), ( Manufacturer Part Number: MK-405 ), ( Type: Air Cut-off Valve )

Review MIKUNI Bsr33/42 Air Cutoff Valve Rebuild Kit

The Mikuni MK-405 BSR33/42 Air Valve Rebuild Kit is a comprehensive solution for the maintenance and repair of Mikuni BSR33 and BSR42 carburetor air valves. Designed to ensure optimal engine performance and fuel efficiency, this rebuild kit includes all necessary components to restore the functionality of your Mikuni carburetor's air valve.

The Mikuni MK-405 kit comes with a complete set of high-quality, OEM (Original Equipment Manufacturer) replacement parts. These parts include an air valve, a spring, a diaphragm, a gasket, and a needle. The air valve is a critical component of the carburetor's idle control system, allowing air to flow in and out of the engine as needed to maintain consistent idle speed and proper fuel-air mixture.

The spring in the Mikuni MK-405 kit is designed to provide the necessary force for the air valve to function correctly. The diaphragm, which is also included in the kit, acts as a seal to regulate the flow of air into the carburetor. The gasket ensures a tight seal between the various components of the air valve, while the needle facilitates the passage of fuel through the carburetor.

Installing the Mikuni MK-405 BSR33/42 Air Valve Rebuild Kit is a straightforward process. By following the included instructions and using common hand tools, most users can complete the installation in a relatively short amount of time. Additionally, the kit's high-quality, precision-machined components ensure a perfect fit and reliable performance, making it an excellent choice for both professional mechanics and dedicated DIY enthusiasts.

In summary, the Mikuni MK-405 BSR33/42 Air Valve Rebuild Kit is an essential tool for maintaining the optimal performance of Mikuni BSR33 and BSR42 carburetors. With its complete set of OEM replacement parts and straightforward installation process, this kit offers an effective and efficient solution for addressing common air valve issues, ensuring your engine runs smoothly and efficiently.

Mikuni MK-405 BSR33/42 air valve is a critical component in the Mikuni carburetor system, ensuring proper fuel delivery and engine performance. When this valve wears out or malfunctions, it may lead to various issues such as poor idling, rough running, or even engine stalling. Replacing it with a rebuild kit can help restore the carburetor's functionality. In this context, let's discuss the pros and cons of buying a Mikuni MK-405 BSR33/42 air valve rebuild kit.

Pros:

1. Cost-effective: A rebuild kit is generally more affordable than purchasing a new air valve assembly. The kit includes all the necessary parts for the repair, reducing the need to buy individual components.

2. Improved performance: Rebuilding the air valve with a new kit can help restore the carburetor's performance, ensuring smooth idling, improved throttle response, and better fuel efficiency.

3. Customizability: A rebuild kit allows users to customize their carburetor setup according to their specific needs. For instance, users can choose to upgrade the valve springs for better performance or select different types of seals for improved sealing.

4. Easy installation: The rebuild process is relatively straightforward, making it an accessible DIY project for most motorcycle enthusiasts. Mikuni provides detailed instructions with the kit, and various online resources and forums can help guide users through the process.

Cons:

1. Requires some technical knowledge: Although the rebuild process is relatively straightforward, it does require some technical knowledge and understanding of the carburetor system. Users without experience in this area may find the process more challenging than anticipated.

2. Time-consuming: Rebuilding an air valve from scratch can take some time, especially for those without prior experience. Users should be prepared to invest several hours into the project.

3. Potential for errors: There is a risk of making mistakes during the rebuild process, which could lead to poor performance or even damage to the carburetor. Users must be meticulous and follow the instructions carefully to avoid these issues.

4. Availability: Mikuni MK-405 BSR33/42 air valve rebuild kits might not be readily available in local shops, requiring users to order them online or through specialized dealers.

Conclusion:

The Mikuni MK-405 BSR33/42 air valve rebuild kit offers cost-effective, customizable, and performance-enhancing benefits for those looking to restore their carburetor's functionality. However, it requires some technical knowledge and time investment, with the potential for errors if not executed carefully. Considering the pros and cons, the Mikuni MK-405 BSR33/42 air valve rebuild kit is a solid choice for motorcycle enthusiasts looking to tackle a DIY project and improve their bike's performance.

part # mk405 prices

  • $26.54-$78.75

specifications iodacarb:

  • brand: Mikuni
  • country of origin: Japan
  • item height: 0.75
  • item length: 8.00
  • item weight: 0.05
  • item width: 5.75
  • manufacturer part number: MK-405
  • type: Air Cut-off Valve

payments iodacarb:

  • wallet: Paypal
  • credit card: Diners-club
  • other

returns iodacarb:

  • policy: Returns Accepted
  • paid by: Seller
  • time: 60 Days

seller iodacarb:

  • # reviews: 111338
  • rating: 99.8%

general iodacarb:

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

offer iodacarb:

  • sold: 0
  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock
  • started: April 18, 2026

shipping iodacarb:

  • type: Fixed
  • service: Standard
  • class: Standard
  • cost: $7.99
  • transit: 3-4 Days
country of origin: japan, item height: 0.75, item length: 8.00, item weight: 0.05, item width: 5.75, type: air cut-off valve,
category: motorcycle parts > motorcycle scooter parts accessories > air intake fuel delivery > carburetors, sku: 11236046993092881,

Mikuni MK-405 Is Similar To:

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5 offers $26.54–$78.75 USD
  • Offer #1: $47.75 price + free delivery = $47.75* total. We'd like you to be sure you know exactly what your getting, before it arrives. Genuine Mikuni rebuild kit.FREE SHIPPING
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