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Tillotson 43-1045 High Side Adjustment Needle (M4 x 0.5)
43-1029 Tillotson Adjustment Needle
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Tillotson 43-1045 High Side Adjustment Needle (M4 x 0.5)

Part Number: 43-1045
Online Price: $16.50
Tillotson 43-1045 High Side Adjustment Needle (M4 x 0.5) for HW-48A Carburetors
Availability: In Stock.

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Description

Tillotson 43-1045 High Side Adjustment Needle – HW-48A Carburetors (M4 x 0.5 Thread)


Restore precise high-speed fuel control with the Tillotson 43-1045 High Side Adjustment Needle, designed specifically for the Tillotson HW-48A carburetor and compatible with other Tillotson HW-series carburetors.


Built to genuine OEM specifications, this M4 x 0.5 threaded adjustment needle allows accurate high-speed mixture tuning—critical for maximizing throttle response, top-end RPM stability, and engine reliability in competitive kart racing applications.


Important: Thread pitch is M4 x 0.5. Always verify your carburetor’s thread size before ordering to ensure proper fitment.


Why the 43-1045 High Side Needle Matters in Kart Racing

In 2-cycle and 4-cycle kart engines running HW-series carburetors, precise high-speed fuel adjustment directly affects:

  • Top-end horsepower
  • Engine temperature control
  • Detonation prevention
  • Throttle response off corner exit
  • Consistent lap times

A worn or damaged high-speed needle can cause lean conditions, erratic tuning, or inconsistent performance under load. Replacing it with a genuine Tillotson OEM component ensures repeatable tuning and dependable race-day performance.


Key Features

  • Genuine OEM Tillotson 43-1045 adjustment needle
  • M4 x 0.5 thread pitch (verify before ordering)
  • Designed for high-side fuel mixture adjustment
  • Compatible with HW-48A and select HW-series carburetors
  • Precision-machined for smooth adjustment and 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

Keeping your carburetor properly tuned is essential for both power and engine longevity. The Tillotson 43-1045 high-speed needle restores accurate fuel metering, helping prevent lean conditions that can lead to overheating or piston damage.


If you're refreshing your carburetor or rebuilding for the season, this is an essential replacement component for serious kart racers.

FAQ

What carburetors is the 43-1045 needle compatible with?

The 43-1045 is designed for the Tillotson HW-48A carburetor and may fit other Tillotson HW-series carburetors that use an M4 x 0.5 threaded high-speed adjustment needle. Always verify thread pitch before ordering.


What does the high side adjustment needle control?

The high side (high-speed) needle controls fuel flow at mid-to-high RPM. It directly affects:

  • Top-end power
  • Engine temperature
  • Throttle response
  • Detonation resistance
  • Overall race consistency

Proper adjustment is critical for competitive kart racing performance.


What is the thread size of the Tillotson 43-1045 needle?

The thread pitch is M4 x 0.5. Confirm your carburetor uses this thread specification before purchasing to ensure proper fitment.


How do I know if my high-speed needle needs replacement?

Common signs include:

  • Inconsistent tuning
  • Lean surge at high RPM
  • Difficulty holding adjustment
  • Visible wear or damage to the needle tip
  • Fuel leakage past the adjustment screw

Replacing a worn needle restores accurate fuel metering and repeatable tuning.


Is this a genuine OEM Tillotson part?

Yes. The 43-1045 is a genuine OEM Tillotson component manufactured to original specifications for proper sealing, fitment, and durability.


Will replacing the high side needle improve performance?

If your existing needle is worn or damaged, replacing it can restore proper fuel control, improve throttle response, and reduce the risk of lean conditions that can damage your engine.

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