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Tillotson HK Inlet Fulcrum Arm
155A-53 Tillotson HK Inlet Fulcrum Arm
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Tillotson HK Inlet Fulcrum Arm

Part Number: 155A-53
Online Price: $1.99
155A-53 OEM Tillotson HK Inlet Fulcrum Arm (Captured)
Availability: In Stock.

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Description

155A-53 OEM Tillotson HK Inlet Fulcrum Arm


Captured Style Inlet Control Lever for HK-Series Carburetors


The 155A-53 Tillotson Inlet Fulcrum Arm (also known as the Inlet Control Lever) is a precision OEM component designed specifically for HK-model Tillotson carburetors. It plays a critical role in regulating fuel flow by lifting the inlet needle, allowing fuel to enter the high and low-speed circuits of the carburetor.

As a captured-style fulcrum arm, the forked end securely holds the needle valve dowel, ensuring consistent operation under racing and high-performance conditions.


Key Features:

  • OEM Part Number: 155A-53
  • Captured fulcrum design secures the needle dowel for reliable operation
  • Controls fuel delivery into the carburetor circuits
  • Impacts fuel flow, tuning, and throttle response
  • Designed specifically for Tillotson HK-series carburetors
  • Not compatible with HL or HR carburetors


Fulcrum Arm Height Info:

The Fulcrum Arm Height is measured from the gasket surface to the top of the arm.

  • Factory setting: Typically 0.085 inches
  • Use with the 705 EC Tillotson Fulcrum Arm Gauge for accurate setup
  • Improper height can affect fuel metering, idle, and acceleration performance


Pro Tip:

When rebuilding or tuning your HK carburetor, always check and adjust the fulcrum arm height for consistent fuel delivery. A fulcrum arm set too high or too low can result in flooding, lean condition, or inconsistent performance.


Compatibility:

  • Fits: Tillotson HK-Series carburetors only
  • Does NOT fit: HL, HR, or other Tillotson models


What’s Included:

  • (1) 155A-53 OEM Tillotson Captured Inlet Fulcrum Arm

FAQ

Q1: What does the Tillotson 155A-53 Fulcrum Arm do?
A: It lifts the fuel inlet needle in your HK carburetor, regulating fuel entry into the carb’s high and low-speed circuits. It plays a key role in fuel delivery and overall carburetor performance.


Q2: What is a "captured" fulcrum arm?
A: A captured fulcrum arm features a forked end that wraps around the needle valve dowel, securely holding it in place. This design offers better stability under vibration and high-performance use.


Q3: How do I measure fulcrum arm height?
A: Measure from the carburetor’s gasket surface to the tip of the fulcrum arm. The factory spec for Tillotson HK models is typically 0.085 inches. Use a proper gauge like the 705 EC Tillotson Fulcrum Gauge for accurate adjustment.


Q4: Will this fulcrum arm fit HL or HR models?
A: No. The 155A-53 is designed exclusively for Tillotson HK carburetors. It is not compatible with HL, HR, or other model series.


Q5: When should I replace the fulcrum arm?
A: Replace it if you notice uneven wear, corrosion, or irregular fuel delivery. It’s often replaced during a carburetor rebuild to ensure consistent performance.

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