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Tillotson 78A-256 Brass High Side/Idle Mixture Screw Washer
78A-256 Tillotson Brass High Side/Idle Mixture Screw Washer
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Tillotson 78A-256 Brass High Side/Idle Mixture Screw Washer

Part Number: 78A-256
Online Price: $0.99
78A-256 Tillotson Brass High/Low Speed Mixture Screw Washer
Availability: In Stock.

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Description

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


Maintain proper fuel mixture adjustment and protect your carburetor’s internal components with the OEM Tillotson 78A-256 Brass Washer. Designed to fit between the mixture screw spring and O-ring, this small but essential washer plays a key role in preventing the spring from cutting into or damaging the O-ring seal.


Key Functions:

  • Acts as a barrier between the needle spring and O-ring
  • Prevents O-ring damage, tearing, or deformation during needle adjustment
  • Ensures a secure, leak-free seal on the high and low-speed fuel circuits

This brass washer is used on the high and low-speed adjustable mixture screws of most Tillotson carburetors, including HL, HB, HX, HM, and HW models. Note: It does not fit the high-side needle of HR model carburetors.


Specifications:

  • Outside Diameter: 0.260"
  • Inside Diameter: 0.176"
  • Thickness: 0.020"
  • Material: Brass
  • Part Number: 78A-256


Fits a Wide Range of Tillotson Models Including:

HL-1A HL-129E,HL-132H,HL-166B&C,HL-189F,HL-227A,E,HL-229A,HL-321E,HL-232A,E, HL-250A,B,C,D,E HL-274E, HL-,292G,HL-293A,F,HL-299E,HL-304E, HL-304WX,WXA,WXG,HL-306A, HL-314E,HL-314F&G, HL-324A,HL-334A,AA,B,AB,WX,WXA,WXG,HL-339A,HL-341A,HL-342A, HL-348A,B,C,D,E, HL-352A,HL-355A,B,C,D,E HL-357A,B, HL-360A, HL-360B,C HL-365A&B,HL-366A,HL-368A,HL-371A,HL-374A, HL-380A,B, HL-383A, HL-384A&B, HL-385A, HL-388A,HL-395A,HR-181B,HR-184A,HR190A,HR-191C,HR-191G,HR-196A,HW-10A,B HW-11A,B, HW-12A, HW-17A, HW-19A, HW-22A, HW-23A, HW-27A, HW-30A, HW-31A, HW-32A, HW-33A, HW-34A, HW-35A, HW-43A, HB-10A, HB-11A, HB-12A, HC-103A,HC-112A, HM-1A, HM-2A, HM-12A, HX-10A, HX-12A

FAQ

What does the Tillotson 78A-256 mixture screw washer do?

This brass washer sits between the adjustment screw spring and the O-ring, preventing the spring from cutting into or damaging the O-ring and ensuring a reliable fuel seal.


Is this washer OEM or aftermarket?

The 78A-256 is a genuine OEM Tillotson part, made to exact specifications for long-lasting performance and compatibility.


Which Tillotson carburetors does it fit?

This washer fits most HL, HB, HX, HM, and HW models but does not fit the high-side needle of HR model carburetors. Always verify your model before ordering.


What are the dimensions of the 78A-256 washer?

  • Outside Diameter: 0.260"
  • Inside Diameter: 0.176"
  • Thickness: 0.020"


Why is the washer important for carburetor function?

Without the washer, the spring may tear the O-ring over time, causing fuel leaks or adjustment issues. This washer helps maintain a secure seal and proper needle function.

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