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EC P4-RK Pro Rebuild Kit for Standard Volume(Single Stack, Gas)Carburetors Captured
P4-RK EC Pro Single Stack Rebuild Kit
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EC P4-RK Pro Rebuild Kit for Standard Volume(Single Stack, Gas)Carburetors Captured

Part Number: P4-RK
Online Price: $18.99
EC P4-RK Pro Rebuild Kit – Tillotson Gas Carburetors (Captured)
Availability: In Stock.

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Description

EC P4-RK Pro Rebuild Kit for Standard Volume (Single Stack, Gas) Tillotson Carburetors – Captured Style


Professional-Grade Carburetor Rebuild Kit for Racing and Small Engines

The EC P4-RK Pro Rebuild Kit is designed for serious racers and engine builders working with standard volume Tillotson gas carburetors that use a captured fulcrum arm and inlet needle. This high-performance kit is engineered for precision, durability, and speed—ideal for karting and other small engine racing applications.


Crafted using OE-quality parts or superior aftermarket upgrades, this Pro Kit outperforms standard rebuild kits by focusing on performance over cost-cutting. It’s trusted by professionals in the small engine and kart racing industry.


Why Choose the EC Pro Rebuild Kit?

  • Built for Performance: Features our exclusive "Fast Action" main metering diaphragm, engineered for faster fuel response and smoother throttle operation. The upgraded “wagon wheel” design provides consistent fulcrum height and a polished finish for better performance.
  • High-Volume Pumping Power: Includes a 0.040" high-volume fuel pump diaphragm gasket—a tech item in karting circles—designed to push more fuel through the carb under racing conditions.
  • Precise Fuel Control: Comes with a .062" short gas seat (0.500" length), ideal for 2-cycle piston port and small block 4-cycle gas engines. Not suitable for alcohol-fueled applications.
  • Qualifying-Grade Diaphragm: Includes a .004" fuel pump diaphragm, commonly used in engines under 60cc or for qualifying sessions. Note: not recommended for main events or long runs due to performance fade after a few laps.
  • Captured Needle & Fulcrum Arm: This "captured" design ensures the fulcrum arm stays in contact with the needle dowel, offering improved stability and fuel consistency—especially beneficial on smooth race tracks.
  • Complete + Exclusive: Kit includes all gaskets, O-rings, and components for a full rebuild, plus a detailed parts diagram showing assembly and part identification—exclusive to EC Pro Kits.


What's Included:

  • Fast Action Main Metering Diaphragm
  • High-Volume 0.040" Fuel Pump Diaphragm Gasket
  • .004" Fuel Pump Diaphragm
  • .375" Welch Plug
  • .875" Flange Gasket
  • Captured Viton Inlet Needle
  • Captured Fulcrum Arm
  • Copper Seat Gasket
  • .062" ID Fuel Seat (0.500" Length)
  • Brass Fuel Strainer Screen
  • Fuel Screen Cork Gasket
  • High/Low Side Mixture Screw O-Rings


Compatible Carburetors:

This Pro Kit fits any Standard Volume (Single Stack, Gas) Tillotson carburetor using a .062” seat and captured-style fulcrum arm and needle. Compatible with carburetors such as:

  • Tillotson HL-166B
  • Tillotson HL-352A
  • And other HL-series standard gas carburetors in racing and industrial use


Important Notes Before Purchase:

  • Confirm your carburetor uses a .062” seat and captured fulcrum setup before ordering.
  • For alcohol-fueled engines, see our Alky Pro Kits.
  • The included .004” diaphragm is for qualifying or short runs only.


Performance You Can Rely On

When winning margins are razor-thin, trust the EC P4-RK Pro Kit to deliver precision, durability, and racing-grade performance. Designed by racers, for racers.

FAQ

Q1: What is the difference between the EC P4-RK and other Tillotson rebuild kits?

A: The EC P4-RK Pro Kit is specifically designed for captured-style Tillotson gas carburetors, featuring racing-grade components like a Fast Action main diaphragm and high-volume pump gasket—not found in standard kits.


Q2: What does “captured” mean for the needle and fulcrum arm?

A: A captured needle means the fulcrum arm has a forked end that locks onto the dowel at the top of the needle. This ensures consistent contact and fuel delivery, especially on smooth tracks.


Q3: What carburetors are compatible with the EC P4-RK kit?

A: It fits standard volume (single stack, gas) Tillotson carburetors using a .062" seat and captured fulcrum arm setup, including HL-166B, HL-352A, and similar HL-series models.


Q4: Can this kit be used with alcohol (alky) fuel systems?

A: No. The EC P4-RK is intended for gas-powered carburetors only. For alky applications, we recommend our Alky Pro Series Kits.


Q5: What’s the purpose of the .004" fuel pump diaphragm?

A: The .004” diaphragm is a thin, high-response part used for qualifying runs or light-load engines under 60cc. It should not be used in main events or heat races due to reduced durability after a few laps.

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