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Tillotson HR Speed Mixture Screw Washer
78A-226 Tillotson HR Speed Mixture Screw Washer
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Tillotson HR Speed Mixture Screw Washer

Part Number: 78A-226
Online Price: $0.99
78A-226 Tillotson HR High-Speed Mixture Screw Washer – OEM Brass
Availability: In Stock.

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Description

78A-226 Tillotson HR High-Speed Mixture Screw Washer – OEM Brass Spacer


The Tillotson 78A-226 High-Speed Mixture Screw Washer is an OEM brass washer designed specifically for the high-speed needle on Tillotson HR series carburetors. It sits between the adjustment spring and O-ring, providing critical protection to prevent the spring from crushing or tearing the O-ring that seals the fuel mixture circuit.


By maintaining the integrity of the O-ring, this washer helps ensure accurate fuel metering and long-lasting carburetor performance.


Key Features:

  • OEM Tillotson part – engineered for precise fit and function
  • Protects the O-ring from spring-related damage
  • Ensures proper sealing of the high-speed mixture screw
  • Fits only the high-speed needle on HR model carburetors
  • Not compatible with low-speed needles or non-HR models


Washer Specifications:

  • Outside Diameter: 0.308"
  • Inside Diameter: 0.195"
  • Thickness: 0.031"
  • Material: Brass
  • OEM Part Number: 78A-226


Compatibility:

  • Specifically designed for HR series Tillotson carburetors
  • Will not fit other models (e.g., HL, HM, HW) or low-speed needles

Note: Always consult your carburetor model’s parts diagram to confirm compatibility before ordering.

FAQ

What is the 78A-226 Tillotson washer used for?

This brass washer is used on the high-speed mixture screw of Tillotson HR carburetors. It prevents the adjustment spring from cutting into or damaging the O-ring, helping maintain proper sealing and fuel delivery.


Is this washer OEM or aftermarket?

The 78A-226 is a genuine OEM Tillotson part, precision-manufactured to meet factory specifications.


Which Tillotson carburetors does it fit?

This washer fits the high-speed adjustment needle of HR model Tillotson carburetors only. It is not compatible with low-speed needles or other carburetor series like HL, HW, or HM.


What are the washer’s dimensions?

  • Outside Diameter: 0.308"
  • Inside Diameter: 0.195"
  • Thickness: 0.031"


Can I use this washer on other carburetor types?

No, the 78A-226 is specifically engineered for Tillotson HR high-speed needles. Using it on other models or circuits may result in improper fit or performance.


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