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Tillotson HR Throttle Shaft Return Spring
24B-357 Tillotson HR Throttle Shaft Return Spring
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Tillotson HR Throttle Shaft Return Spring

Part Number: 24B-357
Online Price: $1.59
Tillotson 24B-357 OEM Throttle Shaft Return Spring – HR Carburetors
Availability: In Stock.

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Description

Tillotson 24B-357 OEM Throttle Shaft Return Spring – For HR-Series Carburetors


The Tillotson 24B-357 Throttle Shaft Return Spring is a genuine OEM part designed specifically for HR-series Tillotson carburetors. This spring applies tension to the throttle shaft, ensuring the throttle plate (butterfly) reliably returns to the closed position when the throttle is released.


Proper return spring tension is essential for safe and predictable engine operation—especially in high-RPM or high-performance applications.


Key Features:

  • OEM Part Number: 24B-357
  • Function: Provides spring tension to close the throttle plate
  • Safety: Prevents throttle from hanging or sticking open
  • Precision Fit: Designed specifically for HR-series throttle shafts
  • Durable Material: High-tension spring steel resists fatigue and corrosion


Fitment Notes:

Each throttle return spring is engineered for a specific carburetor series or body style. The 24B-357 is compatible only with Tillotson HR-series carburetors.

If you’re unsure which spring fits your carb:

  • Refer to our Carburetor Spring Fitment Charts on the Technical Resources page
  • Or contact our support team for expert assistance


Installation Tip:

For added safety and redundancy, we recommend using two forms of throttle return whenever possible:

  • Primary: Throttle shaft return spring (like the 24B-357)
  • Secondary: Throttle cable, rod, or lever return spring

This is especially important for performance engines, kart racing, and handheld equipment.


Compatible With:

  • All Tillotson HR-Series diaphragm carburetors


Ideal For:

  • Small engine tuners and rebuilders
  • 2-stroke race engine setups
  • Chainsaws, kart engines, and handheld power tools
  • Replacing a weak or missing return spring in HR carburetors


FAQ

Q1: What is the function of the Tillotson 24B-357 throttle return spring?

A: This spring keeps tension on the throttle shaft, ensuring that the throttle plate (butterfly) returns to the closed position when the throttle is released. It helps maintain engine control and safety.


Q2: Will this spring fit any Tillotson carburetor?

A: No. The 24B-357 is designed specifically for Tillotson HR-series carburetors. Using the wrong spring may result in poor throttle function or improper fit.


Q3: What happens if I don't use a throttle return spring?

A: Without a throttle return spring, the throttle may stay partially or fully open, potentially causing dangerous over-revving or engine damage—especially in racing or high-speed applications.


Q4: Can I use more than one return spring on my engine?

A: Absolutely. We recommend two forms of throttle return:

  • One on the throttle shaft (like this spring)
  • Another via throttle lever, cable, or rod
    This redundancy improves safety and responsiveness.


Q5: How do I know this is the right spring for my setup?

A: Confirm your carburetor is a Tillotson HR model. You can check your carb body stamping or consult our online reference charts. If unsure, contact support for guidance.


Q6: Is this spring included in rebuild kits?

A: Typically, no. Throttle return springs like the 24B-357 are usually sold separately. If you're doing a full rebuild and want to restore factory performance, we recommend purchasing this spring in addition to your rebuild kit.

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