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Tillotson HW-38A Carburetor for Vortex VLR 100cc Kart Engines

Part Number: HW-38A
Online Price: $274.00
Tillotson HW-38A Diaphragm Carburetor for Vortex VLR 100cc 2-Stroke Kart Engine
Availability: In Stock.

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Description

Tillotson HW-38A Diaphragm Carburetor for Vortex VLR 100cc 2-Stroke Kart Engines


The Tillotson HW-38A diaphragm carburetor is engineered to deliver precise fuel metering and exceptional throttle response for the Vortex VLR 100cc 2-stroke kart engine. Designed with the needs of club racers in mind, this carburetor ensures optimal performance, reliability, and ease of maintenance, making it the ideal choice for entry-level drivers and those transitioning from four-cycle powerplants.


Key Features & Specifications

  • Model: Tillotson HW-38A
  • Type: Diaphragm, pumper-style carburetor – ideal for 2-stroke kart engines
  • Compatibility: Vortex VLR 100cc air-cooled 2-stroke racing engine
  • Application: Competitive kart racing in Junior VLR, Senior VLR, and Masters VLR classes
  • Fuel Delivery: Internally regulated – consistent mixture control regardless of engine speed or chassis G-forces
  • Tuning Range: Wide adjustability with high- and low-speed needle screws
  • Weight: Lightweight design for optimized kart handling and performance
  • OEM Rebuild Kit: Tillotson RK-8HW Rebuild Kit available for maintenance and servicing 


Performance Benefits

  • Immediate Throttle Response: Diaphragm-based fuel delivery system ensures rapid response and optimal atomization at all RPMs.
  • Tunable for All Conditions: Dual needle adjusters allow racers to dial in the perfect air-fuel ratio for any altitude, temperature, or humidity.
  • Race-Proven Reliability: Trusted by top racers in 100cc karting classes worldwide.
  • No Float Bowl Issues: Unlike float-style carbs, the diaphragm design resists fuel starvation or flooding under cornering loads.


Recommended Use

  • Perfect for Vortex VLR 100cc air-cooled engines used in:
    • Junior VLR (ages 12-15)
    • Senior VLR (ages 15+)
    • Masters VLR (ages 32+)


What’s Included

  • 1× Tillotson HW-38A Carburetor
  • Factory needle settings (base configuration—requires tuning)
  • Ready to mount and race with your Vortex VLR engine

FAQ

Frequently Asked Questions (FAQ)


Q1: Is the HW-38A carburetor compatible with all Vortex VLR 100cc engines?

A: Yes. The HW-38A is the OEM carburetor designed for the Vortex VLR 100cc air-cooled 2-stroke engine and is legal for use in Junior, Senior, and Masters VLR kart racing classes.


Q2: What makes the diaphragm carburetor better than a float-style carb for kart racing?

A: The diaphragm system maintains consistent fuel delivery during aggressive cornering and high G-forces, eliminating starvation or flooding issues common in float bowl carbs.


Q3: Do I need to tune the carburetor out of the box?

A: The carburetor comes with baseline needle settings but will require fine-tuning for track conditions, altitude, and temperature. The high-speed and low-speed needles allow easy adjustment.


Q4: What rebuild kit should I use for maintenance?

A: Use the Tillotson RK-8HW rebuild kit, which includes all gaskets, diaphragms, and parts needed to refresh your HW-38A.


Q5: Is the HW-38A carburetor legal for competition?

A: Yes. The HW-38A is the approved carburetor for all VLR classes and complies with class tech rules. Always confirm with your local track or sanctioning body.

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