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Tillotson 43-1046 Low Side Adjustment Needle (8-32 UNC)
43-1029 Tillotson Adjustment Needle
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Tillotson 43-1046 Low Side Adjustment Needle (8-32 UNC)

Part Number: 43-1046
Online Price: $16.50
Tillotson 43-1046 Low Side Adjustment Needle (8-32 UNC) for HW-48A Kart Carburetors
Availability: In Stock.

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Description

Tillotson 43-1046 Low Side Adjustment Needle – HW-48A Carburetors (UNC 8-32 Thread)

Restore precise low-speed fuel control with the genuine Tillotson 43-1046 Low Side Adjustment Needle, engineered specifically for the Tillotson HW-48A carburetor and compatible with select Tillotson HW-series carburetors.


Manufactured to OEM Tillotson specifications, this UNC 8-32 threaded adjustment needle provides accurate idle and transition fuel tuning—critical for smooth throttle pickup, strong midrange acceleration, and consistent engine performance in competitive kart racing.


Important: Thread pitch is 8-32 (UNC). Always verify your carburetor’s thread size before ordering to ensure proper fitment.


Why the Low Side Needle Is Critical in Kart Racing

The low-speed (low side) adjustment needle controls fuel delivery from idle through midrange RPM. In sprint kart racing and other competitive formats, this directly impacts:

  • Corner exit throttle response
  • Clean transition from idle to acceleration
  • Midrange torque consistency
  • Engine temperature stability
  • Reduced hesitation or bog

A worn or damaged low-speed needle can cause lean tip-in, erratic idle, or inconsistent tuning. Replacing it with a genuine Tillotson component ensures reliable, repeatable carburetor adjustment.


Key Features

  • Genuine OEM Tillotson 43-1046 adjustment needle
  • UNC 8-32 thread pitch (verify before ordering)
  • Designed for low-side (low-speed) fuel mixture adjustment
  • Compatible with HW-48A and select HW-series carburetors
  • Precision-machined tip for smooth adjustment and proper sealing
  • Durable construction for long-term kart racing use


Applications

Ideal for:

  • Sprint kart racing
  • Performance 2-cycle kart engines
  • Racing applications using Tillotson HW-series diaphragm carburetors


Maintain Peak Carburetor Performance

Proper low-speed fuel tuning is essential for both power delivery and engine longevity. The Tillotson 43-1046 low side needle restores accurate fuel metering, helping prevent lean hesitation that can contribute to overheating or piston damage.


If you're rebuilding your carburetor or preparing for race season, this OEM replacement needle is an essential component for serious kart racers who demand consistent performance.

FAQ

What carburetors is the 43-1046 needle compatible with?

The 43-1046 is designed for the Tillotson HW-48A carburetor and may fit other Tillotson HW-series carburetors that use an 8-32 (UNC) low-speed adjustment needle. Always confirm thread pitch before ordering.


What does the low side adjustment needle control?

The low side (low-speed) needle controls fuel flow from idle through midrange RPM. It affects:

  • Idle quality
  • Throttle pickup
  • Midrange acceleration
  • Corner exit response
  • Engine temperature stability

Proper low-side tuning is critical in sprint kart racing where throttle transitions are frequent.


What is the thread size of the Tillotson 43-1046 needle?

The thread pitch is 8-32 UNC. This is different from the M4 x 0.5 high-side needle, so verify your carburetor before purchasing.


How do I know if my low side needle needs replacement?

Common signs include:

  • Hesitation or bog when applying throttle
  • Inconsistent idle
  • Needle will not hold adjustment
  • Visible wear or damaged needle tip
  • Fuel seepage around the adjustment screw

Replacing a worn needle restores precise and repeatable carburetor tuning.


Is this a genuine OEM Tillotson part?

Yes. The 43-1046 is a genuine OEM Tillotson component manufactured to original specifications for proper fitment, sealing, and durability.


Will replacing the low side needle improve kart performance?

If your existing needle is worn or damaged, replacing it can improve throttle response, stabilize idle, and help prevent lean transition conditions that may contribute to engine damage.

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