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Tillotson HW Throttle Shutter Screw
15C-20 Tillotson HW Throttle Shutter Screw
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Tillotson HW Throttle Shutter Screw

Part Number: 15C-20
Online Price: $1.29
15C-20 OEM Tillotson Throttle Shutter Screw for HW Carburetors
Availability: In Stock.

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Description

15C-20 Tillotson OEM Throttle Shutter Screw – For HW Series Carburetors


Genuine OEM | Secures Butterfly to Throttle Shaft | HW Model Fitment

The 15C-20 Tillotson Throttle Shutter Screw is a genuine OEM fastener designed to securely mount the throttle shutter (butterfly valve) to the throttle shaft in all Tillotson HW-series carburetors.


This precision-machined screw ensures reliable throttle plate positioning, which is essential for proper air-fuel control and optimal engine performance in small engines and racing applications.


Key Features:

  • OEM Tillotson Part #15C-20
  • Specifically designed for Tillotson HW-Series carburetors
  • Secures throttle shutter (butterfly) to throttle shaft
  • High-strength steel construction for durability
  • Ensures accurate throttle movement and alignment


Installation Tip:

Apply blue thread locker (medium strength) to the screw before installation. This helps prevent it from loosening due to engine vibration, ensuring a secure and safe fit under all conditions.


Compatibility:

  • Fits all Tillotson HW-series carburetors
  • Not compatible with HL, HD, HR, or other non-HW carburetor models


Pro Tip:

Throttle shutter screws are small but critical. A loose or missing screw can cause the throttle shutter to shift or fall into the intake, potentially causing engine damage or performance issues. Always inspect and replace during rebuilds.


Perfect For:

  • Routine maintenance on HW carburetors
  • Replacing worn or stripped butterfly screws
  • High-performance or small engine racing setups
  • Preventative replacement during throttle assembly service

FAQ

Q1: What is the function of the 15C-20 throttle screw?
A: It secures the throttle shutter (butterfly valve) to the throttle shaft in Tillotson HW-series carburetors, ensuring proper airflow control.


Q2: Which carburetors does the 15C-20 fit?
A: This screw fits all Tillotson HW-series carburetors. It is not compatible with HL, HD, or other series.


Q3: Should I use thread locker on this screw?
A: Yes. Apply blue (medium strength) thread locker to prevent the screw from loosening due to engine vibration.


Q4: Can I reuse this screw during a rebuild?
A: Only if the threads are still sharp and the screw head is undamaged. Worn screws should be replaced to ensure a secure throttle connection.


Q5: What happens if this screw comes loose during operation?
A: A loose or missing screw can cause the throttle shutter to shift or fall into the intake, leading to engine failure or severe damage. Always verify tightness during maintenance.

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