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Tillotson HW 31g Inlet Tension Spring
24C-296 Tillotson 31g Inlet Tension Spring
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Tillotson HW 31g Inlet Tension Spring

Part Number: 24C-296
Online Price: $1.79
Tillotson 24C-296 31g Pop-Off Spring for Diaphragm Carburetors
Availability: In Stock.

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Description

24C-296 Tillotson 31g Inlet Tension Spring – OEM Pop-Off Spring for HW, HB, HC, HL, HR, HM, HX Carburetors


The Tillotson 24C-296 31g Inlet Tension Spring is a genuine OEM part used to regulate pop-off pressure and fuel flow in diaphragm carburetors for 2-cycle racing engines. With a lighter 31-gram rating vs 42g & 46g, it allows earlier opening of the inlet needle, which can improve fuel delivery response—especially in high-revving engines.


Key Features:

  • Genuine Tillotson OEM spring
  • 31g pressure for quicker pop-off response
  • Ideal for HW, HL, HM, and other diaphragm-style carbs
  • Enhances throttle response and fuel flow precision
  • Essential tuning part for karting and performance small engines


Tuning Tip from the Track:

For optimal performance in most 2-stroke racing engines, set pop-off pressure as low as possible while still achieving clean, crisp throttle response—especially out of corners. Too low, and you risk bogging. Always tune pop-off after dialing in needle settings, and use new diaphragms to ensure accurate testing and carb behavior.


Fine-tune pressure by:

  • Swapping springs with different gram ratings
  • Adjusting fulcrum arm height
  • Adding shims under the spring for subtle changes


Compatible Carburetor Series:

  • Tillotson HW
  • Tillotson HB / HC / HL / HM / HR / HX

This spring is a trusted go-to for racers and tuners alike aiming for consistent fuel delivery and throttle performance on the track.

FAQ

Q1: What does a 31g Tillotson spring do differently than heavier springs?
A1: It opens the inlet needle earlier, increasing fuel delivery speed—great for sharp throttle response in racing.

Q2: Is this too light for all engines?
A2: Not necessarily, but it’s best for engines that need fast fueling. Test and tune carefully to avoid bogging or flooding.

Q3: Can I use this spring in any Tillotson diaphragm carb?
A3: Yes, it fits HW, HL, HB, HC, HM, HR, and HX models.

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