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Tillotson 43-401 High Speed Mixture Screw
43-401 Tillotson High Speed Mixture Screw
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Tillotson 43-401 High Speed Mixture Screw

Part Number: 43-401
Online Price: $5.99
43-401 OEM Tillotson High-Speed Mixture Screw for Gasoline HL Carburetors
Availability: In Stock.

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Description

43-401 Tillotson OEM High-Speed Mixture Screw – Steel Screw for Gasoline HL Carburetors


The 43-401 Tillotson High-Speed Mixture Screw is an essential tuning component designed for the high side of gasoline-powered Tillotson HL-series carburetors, especially those found on small-displacement engines used in light-duty or racing applications.


Made from high-quality OEM-grade steel, this adjustment screw delivers reliable, precise control over your engine’s fuel mixture at high RPMs, helping you fine-tune performance when it matters most.


Key Features:

  • OEM Part #43-401 – Guaranteed fit for select Tillotson HL models.
  • High-Speed Fuel Adjustment – Controls fuel flow to the high side nozzle for optimal top-end RPM.
  • Precision Tuning – Tune for peak performance at wide-open throttle, especially on long straightaways.
  • Durable Steel Construction – Built to withstand high temperatures and vibration in demanding engine environments.
  • Designed for Gasoline Engines – Optimized for use with gasoline-fueled Tillotson carburetors.


Compatible Carburetor Models:

  • HL-129A
  • HL-166B
  • HL-166C
  • HL-189F
  • HL-274E
  • HL-324A
  • HL-352A
  • HL-382A

Always verify your Tillotson carburetor model before ordering to ensure compatibility.


Tuning Tip:

The high-speed screw directly controls fuel delivery at high RPM. For best results, adjust this screw during wide-open throttle (WOT) on the longest straightaway of your track or course. Proper tuning ensures peak RPM without running too lean or rich.


Perfect For:

  • Small-displacement 2-cycle engines
  • Kart racing and performance tuning
  • Engines using gasoline with HL-series Tillotson carburetors
  • Replacing worn or stripped mixture screws with OEM-quality parts

FAQ

Q1: What is the capacity of the 2 Quart Racing Go-Kart Plastic Fuel Tank?

A1: The 2 Quart Racing Go-Kart Fuel Tank has a 2-quart capacity, making it ideal for short to medium races in stock gas karting classes. This size provides enough fuel for typical race durations while maintaining a lightweight, compact design.


Q2: Does the fuel tank come with mounting hardware?

A2: The 2 Quart Racing Go-Kart Plastic Fuel Tank does not include mounting hardware to secure it to the kart chassis. You will need to supply your own hardware or check compatibility with your specific kart model's floor pan.


Q3: What features come with the fuel tank?

A3: The fuel tank comes with a petcock valvefuel tank vent, and fuel tank cap. These components ensure proper fuel flow and safety during racing conditions.


Q4: Can I use methanol in this fuel tank?

A4: Yes, you can use methanol in the 2 Quart Racing Go-Kart Fuel Tank, but keep in mind that methanol absorbs moisture from the air, which can dilute the fuel and negatively affect performance. Always store methanol in airtight canisters and flush the system after each race to prevent issues.


Q5: How do I maintain the fuel tank and system?

A5: To ensure optimal performance, avoid leaving methanol in your fuel tank for extended periods. Flush your fuel linefuel pumpcarburetor, and engine after each race. Additionally, make sure your fuel tank vent is clear and unrestricted, as a blocked vent can cause fuel flow issues.


Q6: Why is the fuel tank vent important?

A6: The fuel tank vent allows air to enter the tank as fuel is consumed, preventing a vacuum from forming. If your kart is suddenly running lean, check the fuel tank ventcarburetor ventfuel line, and fuel pump before adjusting the carburetor, as these are more likely to cause issues than jetting problems.


Q7: Is this fuel tank compatible with all kart models?

A7: The 2 Quart Racing Go-Kart Plastic Fuel Tank is compatible with most go-kart models that use a 2-quart fuel tank. However, it does not include mounting hardware, so ensure compatibility with your kart's chassis floor pan or use appropriate hardware for installation.


Q8: Can I use this fuel tank for longer races?

A8: While the 2 Quart Racing Go-Kart Fuel Tank is great for short to medium races, many racers opt for a larger fuel tank for longer races or when using methanol. This tank is designed for stock gas classes but can be suitable for shorter race events in karting competitions.


Q9: How do I know if my kart’s fuel system is having issues?

A9: If your kart suddenly runs lean or lacks power, start by checking the fuel tank ventcarburetor ventfuel pump, and fuel lines. Blocked or restricted fuel vents are often the culprit, so ensure they are clear before diagnosing more complicated issues like carburetor jetting.


Q10: Is this fuel tank suitable for racing in wet or rainy conditions?

A10: Yes, the 2 Quart Racing Go-Kart Plastic Fuel Tank is durable and designed to handle the demands of kart racing. However, ensure that your fuel system is properly sealed and maintained to prevent moisture from affecting your fuel, especially when racing in wet conditions.

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