1. Home
  2. Carburetors
  3. Tillotson
  4. HR-Series
  5. HR-181B
  6. Tillotson 24B-247 High Speed Mixture Screw Spring
Tillotson 24B-247 High Speed Mixture Screw Spring
24B-247 Tillotson High Speed Mixture Screw Spring
Write a Review

Tillotson 24B-247 High Speed Mixture Screw Spring

Part Number: 24B-247
Online Price: $0.89
Tillotson 24B-247 High-Speed Mixture Screw Spring
Availability: In Stock.

Send to:

*We'll ask for shipping info at checkout

Description

Tillotson 24B-247 High-Speed Mixture Screw Spring – OEM Tension Control


The Tillotson 24B-247 High-Speed Mixture Screw Spring is a genuine OEM part designed to maintain proper tension on the high-speed mixture screw in diaphragm-style carburetors. It prevents the screw from vibrating loose during operation, ensuring consistent fuel delivery at higher throttle openings.


This spring is a small but critical component for maintaining precise fuel mixture tuning and engine reliability, especially in high-RPM 2-stroke applications.


Key Features:

  • OEM Part Number: 24B-247
  • Applies consistent tension to the high-speed mixture screw
  • Helps prevent tuning screw from backing out during operation
  • Compatible with select Tillotson HL, HR, HW, and other diaphragm carburetors
  • Made from high-tension, corrosion-resistant spring steel


Tuning Note:

If your high-speed mixture screw requires more than 3 turns out for proper tuning, it may indicate:

  • An incorrect carburetor application
  • Internal fuel delivery problems
  • A worn or misadjusted needle and seat assembly

Running the screw excessively out can risk losing the adjustment screw during operation. As a temporary fix, you can add an extra washer to increase spring preload, but this should not be considered a permanent solution.


Always consult your engine builder or carburetor specialist for persistent tuning issues.


Ideal For:

  • Rebuilding or servicing Tillotson carburetors
  • Maintaining proper tension on fuel mixture screws
  • Racing or performance 2-stroke engine tuning
  • Ensuring safe, consistent mixture screw retention under vibration

FAQ

Q1: What does the Tillotson 24B-247 spring do?

A: It applies tension to the high-speed mixture screw, preventing it from vibrating loose and holding it firmly in place for consistent fuel tuning.


Q2: Can this spring be used on both high and low-speed screws?

A: The 24B-247 is designed specifically for the high-speed screw. Some models may share the same spring for both circuits, but always confirm fitment based on your carburetor model.


Q3: My screw is more than 3 turns out — is that normal?

A: No. If your screw needs more than 3 turns out for proper tuning, it may indicate:

  • Incorrect carburetor model
  • Blocked or misaligned fuel circuits
  • Needle/seat wear or leakage

Contact your engine builder or carburetor expert for further diagnosis.


Q4: Can I use extra washers to increase spring tension?

A: As a temporary fix, yes — adding a washer can increase tension and prevent the screw from backing out. However, it’s not a substitute for addressing underlying tuning or compatibility issues.


Q5: What carburetors is this spring compatible with?

A: It's commonly used with Tillotson HL, HR, HW, and other diaphragm-style carburetors. Refer to your specific model’s parts diagram or our technical reference page for verification.

Related Items

Recently Viewed Items

Logo