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Tillotson Throttle Shutter Screw
15C-29 HL Throttle Shutter Screw
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Tillotson Throttle Shutter Screw

Part Number: 15C-29
Online Price: $3.79
15C-29 OEM Tillotson Throttle Shutter Screw for HL Carburetors
Availability: In Stock.

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Description

15C-29 Tillotson OEM Throttle Shutter Screw – For HL Series Carburetors


Genuine OEM | Secures Throttle Shutter (Butterfly) | HL Series Compatible

The 15C-29 Tillotson Throttle Shutter Screw is a genuine OEM fastener designed to securely attach the throttle shutter (butterfly plate) to the throttle shaft inside Tillotson HL-series carburetors.


This small but essential screw plays a crucial role in controlling airflow through the carburetor, ensuring smooth and consistent throttle response.


Key Features:

  • OEM Tillotson Part #15C-29
  • Secures the throttle shutter (butterfly) to the throttle shaft
  • Designed specifically for Tillotson HL carburetors
  • Precision fit and thread pitch for optimal engagement
  • Hardened steel for long-lasting durability


Installation Tip:

Use blue thread locker (medium strength) on the screw threads during installation. This prevents the screw from backing out due to engine vibration, which can lead to throttle failure or damage.


Compatibility:

  • Fits all Tillotson HL-Series carburetors
  • Not intended for HD, HR, HW, or other non-HL models


Pro Tip:

Never reuse a worn or stripped throttle screw—failure to maintain a tight seal between the shutter and shaft can result in air leaks, poor throttle response, or even catastrophic failure in high-performance racing applications.


Ideal For:

  • Rebuilds & restorations of HL-series carburetors
  • Racing engine throttle maintenance
  • Preventative replacement during throttle shaft service

FAQ

Q1: What does the 15C-29 Tillotson screw do?
A: It secures the throttle shutter (also called the butterfly plate) to the throttle shaft inside Tillotson HL-series carburetors.


Q2: Will this screw fit all HL Tillotson carburetors?
A: Yes, the 15C-29 is designed to fit all Tillotson HL-series carburetors.


Q3: Can I use this on HD or other non-HL carburetors?
A: No, this screw is designed specifically for HL-series carbs and may not be compatible with HD, HR, HW, or HX models.


Q4: Do I need thread locker when installing this screw?
A: Yes. It’s strongly recommended to use a blue (medium strength) thread locker during installation to prevent the screw from loosening due to vibration.


Q5: Should this screw be reused during a rebuild?
A: If the threads are worn or stripped, it’s best to replace the screw to avoid throttle failure or air leaks. Always inspect the screw condition during rebuilds.


Q6: What happens if the throttle shutter screw comes loose?
A: If the screw backs out during operation, the throttle shutter may detach or shift, causing erratic airflow, throttle failure, or engine damage—especially in racing applications.

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