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Tillotson 43-966 High Speed Mixture Screw
43-966 Tillotson High Speed Mixture Screw
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Tillotson 43-966 High Speed Mixture Screw

Part Number: 43-966
Online Price: $10.20
43-966 OEM Tillotson High-Speed Mixture Screw for HL Carburetors
Availability: In Stock.

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Description

43-966 Tillotson OEM High-Speed Mixture Screw – Steel Adjustment Screw for HL Carburetors


Fine-tune your engine’s high-RPM performance with the 43-966 Tillotson High-Speed Mixture Screw. This OEM steel adjustment screw is designed for the high side of Tillotson HL series carburetors, commonly used on high-performance racing go-kart engines.


Whether you're dialing in for top speed on the straightaway or optimizing your setup for consistent wide-open throttle (WOT) performance, this screw gives you the precise fuel delivery control needed to stay competitive.


Key Features:

  • OEM Part #43-966 – Guaranteed fit and performance for supported Tillotson models.
  • High-Speed Mixture Control – Adjusts fuel flow to the high side nozzle for optimal top-end engine RPM.
  • Steel Construction – Durable OEM-grade steel resists wear and provides consistent tuning over time.
  • Ideal for Racing – Critical for peak performance on long straights and WOT segments in kart racing.


Compatible Tillotson Carburetor Models:

  • HL-334WX
  • HL-334WXA
  • HL-334WXG

Always verify your carburetor model before ordering to ensure proper fitment.


Tuning Tip:

The high-speed mixture screw directly influences fuel delivery at higher RPMs. Tune this needle on the longest straightaway of your track, under wide-open throttle, to achieve maximum power output without running too lean or rich.


Perfect for:

  • Racing go-karts using Tillotson HL carburetors
  • Methanol or gasoline fuel setups (with proper tuning)
  • Performance builders seeking OEM-quality replacement parts

FAQ

What is the Tillotson 43-966 High-Speed Mixture Screw used for?

The 43-966 screw controls the high-speed fuel mixture in select Tillotson HL carburetors. It’s essential for tuning top-end engine performance, especially in go-kart racing applications.


Which carburetors are compatible with the 43-966 screw?

This OEM screw fits Tillotson HL-334WX, HL-334WXA, and HL-334WXG carburetors. Always confirm your carb model before purchasing.


How do I tune the high-speed mixture screw?

Tune the high-speed needle at wide-open throttle (WOT), ideally on your longest straightaway. Adjust for peak RPM without running too lean or rich.


Is the 43-966 screw suitable for methanol or gasoline?

Yes. It works with both methanol and gasoline, as long as the carburetor is tuned appropriately for your fuel type.


Is this an OEM Tillotson part?

Yes, the 43-966 is a genuine OEM Tillotson part, made from durable steel for long-term use and reliable performance.

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