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Tillotson RK-104HL OEM High Volume (Double Stack) Rebuild Kit
RK-104HL OEM Tillotson Double Stack Rebuild Kit
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Tillotson RK-104HL OEM High Volume (Double Stack) Rebuild Kit

Part Number: RK-104HL
Online Price: $20.14
Tillotson RK-104HL OEM Rebuild Kit – High Volume HL Carburetors
Availability: In Stock.

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Description

Tillotson RK-104HL OEM Rebuild Kit – High Volume (Double Stack) HL-Series Carburetors


The Tillotson RK-104HL Rebuild Kit is a genuine OEM service kit built for high-performance double-stack HL-series carburetors. Trusted by top racers, this kit is specifically designed to restore fuel flow, sealing, and diaphragm responsiveness in methanol-tuned and high-fuel-demand applications — without the risks of generic or poorly fitting aftermarket parts.


Why Choose the RK-104HL for Your High-Volume Carburetor?

Double Stack Pump Plate Compatibility

Designed for high-volume pump stack carburetors (aka double stack, alky plates, or double pumpers) that use a 3-plate aluminum stack. These carburetors are ideal for engines running methanol or operating under extreme load and high RPMs — especially in karting, drag racing, and other competitive motorsports.

Note: Not compatible with standard volume (2-plate) carburetors. Gaskets and diaphragms are not interchangeable between stack types.


High-Flow Fuel Control

Includes a .093” short inlet seat with cross-hole for maximum fuel delivery, and an uncaptured fulcrum arm and needle valve. This setup is specifically engineered to prevent needle bounce and maintain consistent fuel metering during harsh conditions, including vibrations and shock from racing environments.


OEM Quality You Can Trust

Unlike aftermarket rebuild kits that often compromise material quality and fit, Tillotson OEM kits are built to withstand modern fuels (including methanol), resist swelling, and offer precision performance under racing conditions.


Kit Includes

  • Main Diaphragm
  • Main Diaphragm Gasket
  • Fuel Pump Diaphragm
  • Fuel Pump Diaphragm Gasket
  • Inlet Valve Diaphragm
  • Inlet Valve Diaphragm Gasket
  • Fuel Strainer Cork Gasket
  • .530” Fuel Inlet Seat (.093” bore w/ cross-hole)
  • Copper Seat Gasket
  • Uncaptured Inlet Needle
  • Uncaptured Fulcrum Arm
  • .500” Welch Plug
  • .375” Welch Plug
  • 1.00” Flange Gasket


Compatible With HL-Series High Volume Carburetors

Rebuilds most high-volume Tillotson HL carbs, including:

  • HL-314G
  • HL-248A / B / C / D / E
  • HL-355A / B / C / D / E
  • HL-360B / C
  • HL-368A
  • HL-380A / B
  • HL-304WXA


Looking for a racing upgrade?
Use our EC Pro P8-MRK Kit, engineered for enhanced performance, durability, and tuning flexibility.

FAQ

Q1: What’s the difference between standard and high-volume (double stack) Tillotson carburetors?

High-volume (double stack) carburetors use three aluminum pump plates and are optimized for methanol and high fuel demand applications. Standard carbs use two plates and are typically gas-fueled. The gaskets and diaphragms are not interchangeable between the two.


Q2: What size is the fuel inlet seat in this kit?

The RK-104HL includes a short .530" seat with a .093" bore and cross-hole, ideal for high-volume fuel delivery.


Q3: What type of fulcrum arm and needle are included?

This kit comes with an uncaptured-style needle and fulcrum arm, where the arm sits on top of the needle without locking it in place. This configuration is preferred in racing carburetors for consistent metering and vibration resistance.


Q4: Will this kit work with HL-355E or HL-380A carburetors?

Yes. Both are double stack HL-series carburetors and fully compatible with the RK-104HL rebuild kit.


Q5: Do I need a performance upgrade for methanol racing?

This OEM kit is methanol-capable, but for maximum tuning precision and durability, we recommend the EC Pro P8-MRK Kit, specifically built for high-output engines running on alcohol fuels.

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