Tillotson 78A-256 Brass Mixture Screw Washer - High/Low Side - OEM Carburetor Part

Securing a leak-free fuel circuit is the most critical step in any go karts supply rebuild, and the Tillotson 78A-256 Brass Mixture Screw Washer is the exact hardware required to protect your carburetor's O-rings. Designed to sit perfectly between your fuel adjustment needle spring and the O-ring, this OEM brass washer prevents the spring from tearing, crushing, or deforming the seal during high-vibration racing conditions. When you are pushing the limits on the track, a compromised fuel circuit seal can lead to disastrous lean conditions or erratic RPMs.

Exact Parts Number for Tillotson Carburetors

Finding the correct parts number is vital when rebuilding your kart's fuel system. The 78A-256 is the exact OEM replacement for most Tillotson carburetors, including the HL, HB, HX, HM, and HW models. By distributing pressure evenly across the O-ring, this brass washer ensures a leak-free seal on both the high and low-speed fuel circuits. Whether you are sourcing components from a local go karts shop near me or ordering specialized comet parts online, insisting on genuine Tillotson hardware guarantees your tuning adjustments remain locked in place.

Precision Tuning and Reliability

Don't let a missing or worn washer ruin your race weekend. If you've been searching for go karts for sale near me, you already know that maintaining a high-performance machine requires attention to the smallest details. This washer facilitates easy disassembly for cleaning and supports the fine-tune adjustments necessary for optimal RPM output.

• OEM Tillotson Quality: Genuine 78A-256 replacement guarantees exact fitment and reliable performance.
• O-Ring Protection: Acts as a solid barrier, preventing the adjustment spring from cutting into the rubber O-ring.
• Leak-Free Seal: Maintains critical pressure on the fuel circuits to prevent air leaks and fuel starvation.
• Broad Compatibility: Fits the high and low-speed adjustable mixture screws on HL, HB, HX, HM, and HW carburetors.
• Corrosion-Resistant Brass: Withstands harsh racing fuels and extreme engine temperatures without degrading.
• Consistent Tuning: Locks in your adjuster needle positions so your engine stays responsive through every chicane.
• Easy Maintenance: Facilitates quick, hassle-free disassembly when cleaning or rebuilding your carburetor.

Frequently Asked Questions

Q: Where exactly does the 78A-256 brass washer sit in the carburetor assembly?

A: This washer is designed to be placed on the mixture screw between the tension spring and the rubber O-ring. It acts as a protective barrier to ensure the spring does not dig into or deform the O-ring during adjustment.

Q: Why is it important to use a brass washer instead of a standard steel one?

A: Brass is corrosion-resistant and provides the ideal surface hardness to protect the O-ring from the spring's tension without causing premature wear or chemical degradation when exposed to racing fuels.

Q: Will this washer fit my Tillotson carburetor?

A: The 78A-256 is a standard OEM component compatible with most Tillotson HL, HB, HX, HM, and HW series carburetors. It is the correct size for both high and low-speed mixture screw assemblies.

Q: Should I replace this washer every time I rebuild my carburetor?

A: Yes. If you are replacing your O-rings and springs during a rebuild, you should always inspect the washer. If it shows signs of grooving or deformation, it must be replaced to ensure a consistent, leak-free seal.

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