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About mikuni flat slide carburetor

Types of Mikuni Flat Slide Carburetor

Mikuni flat slide carburetors are a popular type of carburetor used in high-performance engines. They are designed to offer improved throttle response and fuel atomization. There are two main types of mikuni flat slide carburetors, as discussed below:

  • TM Series
  • Mikuni TM series flat slide carburetors are commonly used in two-stroke motorcycles. The design of these carburetors features a 2-stroke throttle valve. The carburetors also come with a flat slide configuration, which offers a smooth airflow and a great response to the throttle. The TM series carburetors are available in different sizes, making them suitable for different engine sizes and applications. These carburetors come with a screw to adjust the idle bypass air. They also feature a separate float bowl vent to cater to the engine's lubrication requirements.

  • TMX Series
  • The 28mm mikuni flat slide carburetor series carburetors are designed for off-road and high-performance 2-stroke applications. These carburetors are also used in racing motorcycles. They feature a flat slide throttle valve that allows for a precise and instantaneous throttle response. The TMX series carburetors also have a variable venturi design. The design offers a great airflow that maximizes the engine's performance. These carburetors also come with an adjustable accelerator pump system. The system allows for instant throttle response and acceleration, which is essential for off-road and racing applications. The TMX series carburetors also come with a throttle position sensor port. This allows for easy installation of a TPS for engines that require it.

Specification and Maintenance of Mikuni Flat Slide Carburetors

When shopping for a flat slide carburetor for a particular engine, it is important to know the specifications and maintenance requirements. Here are some of the specification details.

  • Carburetor size:
  • Engine displacement and application determine the size of the carburetor. It is measured in millimeters, which is the diameter of the carburetor bore. The carburetor size can range from 24mm to 44mm or more. A bigger carburetor offers more airflow and fuel delivery, which results in increased engine performance and power. However, bigger carburetors are not suitable for low-speed performance. Engine displacement and other modifications should be considered to ensure the carburetor is compatible.

  • Slide type:
  • Standard flat slide carburetors feature butterfly slides. Some models have a different slide design that improves throttle response and airflow management. Slides are made from a heat-resistant material and have a low weight to offer smooth operation and durability.

  • Air and fuel circuits:
  • Carburetors have complex air and fuel delivery systems that include the main jet, needle jet, needle valve, pilot jet, and air screw. Main jets control fuel delivery at full throttle and high engine speeds. Needle jets control fuel delivery at part throttle and moderate engine speeds. Pilot jets control fuel delivery at low throttle and idle. Air screws control air-fuel mixture. A well-coordinated action among the various components is required to ensure optimum performance, fuel efficiency, and emissions control.

  • Choke type:
  • The choke mechanism may be a pull or electric choke. A pull choke is operated using a pull lever, while an electric choke functions automatically when the engine temperature is cold. The choke is important when starting a cold engine because it restricts airflow to the engine, making the fuel mixture rich.

  • Float type:
  • The float chamber may be a round or flat type. The float chamber design determines the fuel capacity and space available within the carburetor body. A round float chamber is suitable for vintage and older motorcycles.

The mikuni flat slide carburetors are available with different specifications depending on the specific needs of the engine. Some of the carb specifications to look out for include:

  • Carburetor bore diameter
  • Needle valve
  • Jet type
  • Throttle valve
  • Needle jet
  • Pilot jet
  • Main jet
  • Choke diameter

Flat slide carburetors are reliable and provide better throttle response compared to other types of carburetors. However, they require specific maintenance routines to ensure they function properly. Here are some general maintenance tips for the flat slide carburetor.

  • 1. Regular cleaning: Over time, dirt, varnish, and other deposits can build up inside the carburetor, affecting its performance. Therefore, it is important to clean it regularly using a carburetor cleaner and compressed air to remove debris and deposits.
  • 2. Inspection of the throttle slide and valve: Make sure the valve and slide are not sticking, binding, or damaged to ensure smooth operation of the throttle.
  • 3. Spark plug inspection: A spark plug helps to determine the condition of the engine. If the spark plug shows signs of running rich or lean, adjust the carburetor settings accordingly.
  • 4. Check the fuel level: Make sure the fuel level is within the recommended range. If it is too high or too low, adjust the float level accordingly.
  • 5. Check the air filter: Ensure the air filter is clean and not clogged. A clogged air filter can affect engine performance. Replace it if necessary.
  • 6. Periodic maintenance of the carburetor is important to ensure optimal engine performance. With regular maintenance, the mikuni flat slide carburetor will offer years of reliable service.

How to Choose Mikuni Flat Slide Carburetors

When selecting mikuni flat slide carburetors, here are some things to consider:

  • Engine Size and Type
  • Carburetor size should match engine needs. Larger engines need bigger carbs to supply enough fuel. For high-performance engines, choose carburetors designed to maximize airflow and fuel atomization, thus optimizing power output. Additionally, carburetor tuning for a two-stroke engine requires more precision, considering the fuel-air mixture's critical importance in two-stroke engines.

  • Performance Goals
  • Consider performance goals. For off-road bikes, select a carb for quick throttle response and improved low-end power. For street bikes, choose a carb that enhances mid to high-end power and overall performance.

  • Tuning Flexibility
  • Consider tuning flexibility. Carburetors that allow adjustment of needle clip positions, pilot screws, and the option to change jets make it easier to fine-tune for various riding conditions and modifications.

  • Riding Conditions
  • Riding conditions also matter. For bikes primarily used at high altitudes, select a carburetor with a proper jetting setup for improved performance and drivability in reduced air pressure environments.

  • Brand and Quality
  • Consider the brand and quality of the carburetor. Choose a genuine mikuni flat slide carburetor, known for its high quality and performance. Avoid counterfeit or low-quality imitations that may cause reliability and performance issues.

  • Budget Considerations
  • Keep in mind that genuine Mikuni carburetors may be more expensive upfront but offer long-term value and performance. Counterfeit or low-quality carburetors may save money initially but result in reliability and performance issues, potentially costing more in the long run.

  • Research and Consultation
  • Research and consult with experienced professionals or tuning guides to ensure the selected carburetor best suits the specific bike, modifications, and riding needs. Also, consider compatibility with the bike's intake and air filter setup, ensuring optimal performance and reliability.

How to replace Mikuni flat slide carburetors

Replacing a carburetor can be a complex task. However, with the right tools, time, and a bit of mechanical know-how, it can be done. Before starting the replacement process, gather all the necessary tools and materials, such as the correct replacement Mikuni flat slide carburetor kit, screwdrivers, cleaning rags, gaskets, and safety equipment.

  • 1. Disconnect the battery to avoid any sparks.
  • 2. Remove the air intake system to access the carburetor.
  • 3. Disconnect the throttle and choke cables, and take note of their positions for reinstallation.
  • 4. Disconnect the fuel line and plug it to avoid any leaks.
  • 5. Remove the mounting bolts that hold the carburetor in place.
  • 6. Carefully pull the old carburetor out, ensuring no debris falls into the intake manifold.
  • 7. Clean the mounting surface and inspect it for any damage.
  • 8. Install new gaskets and O-rings to ensure an airtight seal.
  • 9. Insert the new 28mm mikuni flat slide carburetor into the intake manifold.
  • 10. Reconnect the mounting bolts, ensuring they are tightened to the specified torque.
  • 11. Reconnect the fuel line, throttle and choke cables, and air intake system.
  • 12. Re-adjust the throttle and choke cables to the correct tension.
  • 13. Double-check all connections and fittings for leaks.
  • 14. Reconnect the battery and start the engine to ensure proper functionality.

Q and A

Q1: Why are Mikuni flat slide carburetors preferred over other types?

A1: They are preferred because they offer better throttle response and more power compared to other carburetors.

Q2: What are the main components of a mikuni flat slide carburetor?

A2: The main components include the throttle valve, needle jet, main jet, and float bowl.

Q3: What is the difference between a flat slide carburetor and a round slide carburetor?

A3: The difference is in the design of the throttle slide. The flat slide has a flat design, while the round slide has a round shape.

Q4: How often should Mikuni flat slide carburetors be serviced?

A4: They should be serviced regularly, according to the manufacturer's recommendations, to ensure optimal performance.

Q5: Can a Mikuni flat slide carburetor be used on any engine?

A5: No, it is designed for specific engine types and sizes, so it is important to choose the right one for the engine.