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Tillotson HW 46g Inlet Tension Spring
24C-297 Tillotson 46g Inlet Tension Spring
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Tillotson HW 46g Inlet Tension Spring

Part Number: 24C-297
Online Price: $2.10
Tillotson 24C-297 46g Pop-Off Spring for Diaphragm Carburetors
Availability: In Stock.

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Description

24C-297 Tillotson 46g Inlet Tension Spring – OEM Pop-Off Spring for HW, HB, HC, HL, HR, HM, HX Carburetors


The Tillotson 24C-297 46g Inlet Tension Spring is a genuine factory-rated component used in tuning 2-stroke racing carburetors. Its 46-gram pressure provides a higher resistance vs 31g & 42g springs, delaying the pop-off for more controlled fuel flow and better throttle smoothness, especially at low RPM.


Key Features:

  • OEM Tillotson 46g pop-off spring
  • Ideal for controlling low-RPM richness
  • Stable fuel metering and throttle consistency
  • Prevents premature fuel flooding
  • Compatible with HW, HL, HM, HB, and other diaphragm-style carbs


Tuning Tip:

Use this spring when you need to lean out low-end response or if you're experiencing rich conditions. Heavier springs prevent early needle lift and reduce low-RPM flooding. Always test with fresh diaphragms and ensure the fulcrum height is properly set.


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: When should I use the 46g spring?
A1: When you need to delay fuel delivery to correct a rich low-end condition or flooding under deceleration.

Q2: Is 46g too heavy for all engines?
A2: It depends on engine demand and carb settings. Heavier springs help prevent over-fueling in low-RPM scenarios.

Q3: Will it fit my Tillotson HW carburetor?
A3: Yes, it's fully compatible with HW, HL, HM, HB, HC, HR, and HX series Tillotson diaphragm carburetors.

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