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Tillotson Throttle Shutter Screw/Throttle Lever Retaining Screw
15C-52 HL Throttle Shutter Screw
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Tillotson Throttle Shutter Screw/Throttle Lever Retaining Screw

Part Number: 15C-52
Online Price: $3.79
15C-52 OE Tillotson Throttle Shutter / Throttle Lever Retaining Screw
Availability: In Stock.

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Description

15C-52 OE Tillotson Throttle Shutter / Throttle Lever Retaining Screw – Large Head Style


OEM Replacement | Fits HL & HM Carburetors | Vintage Large-Head Design

The Tillotson 15C-52 is an original equipment (OE) throttle shutter screw with a larger-diameter screw head, designed to secure the throttle plate (shutter) to the throttle shaft in many HL-series Tillotson carburetors. This screw also functions as the throttle lever retaining screw in various HM-series models.

Originally used in older production runs, this screw features a wider head than current models, making it ideal for restoring vintage carburetors or maintaining factory-correct setups.


Key Features:

  • OEM Tillotson Part – 15C-52
  • Larger-Diameter Head: Suited for older HL carburetor designs
  • Dual Function: Secures throttle shutter or throttle lever
  • Steel Construction: Durable, corrosion-resistant material
  • Ideal for Restoration or Rebuilds


Applications:

  • HL Series: Used to retain the throttle shutter (butterfly) on older HL-series Tillotson carburetors.
  • HM Series: Also serves as the throttle lever retaining screw for many HM-series carburetors.

Note: Due to the larger head size, this screw may not fit newer Tillotson carburetors that use the smaller modern-style screws. Always verify your carb model before ordering.


Perfect For:

  • Vintage Kart Engine Rebuilds
  • 2-Cycle and 4-Cycle Racing Applications
  • Collectors & Restorers of Classic Small Engines
  • Replacement During Throttle Assembly Maintenance


Why Choose the 15C-52 Screw?

  • Exact OEM fit for vintage HL and HM Tillotson carbs
  • Hard-to-find part with legacy compatibility
  • Durable, reliable, and easy to install
  • Backed by our performance carburetor expertise

FAQ

Q1: What does the 15C-52 screw do?
A: The 15C-52 is used to retain the throttle shutter (also known as the butterfly valve) on older HL-series Tillotson carburetors. It can also be used to secure the throttle lever on HM-series models.


Q2: How is this screw different from newer throttle shutter screws?
A: The 15C-52 features a larger screw head, which was standard on older Tillotson carburetors. Modern equivalents typically have smaller heads and may not match the original dimensions.


Q3: Can I use this screw on any HL Tillotson carburetor?
A: It's compatible with many HL-series models, especially older or vintage versions. Newer HL carbs may use different screw dimensions. Check your model before purchasing.


Q4: Will this screw fit HM Tillotson carburetors?
A: Yes, it also functions as a throttle lever retaining screw on various HM-series Tillotson carburetors.


Q5: Is this an original Tillotson part?
A: Yes, this is a genuine OE Tillotson part (Part No. 15C-52), not an aftermarket substitute.


Q6: Should I replace this screw during a throttle rebuild?
A: Absolutely. If you're servicing or rebuilding the throttle assembly on an HL or HM Tillotson carburetor, it's recommended to replace worn or stripped screws like the 15C-52.

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