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  6. EC P3-RK Pro Rebuild Kit for Standard Volume(Single Stack)Carburetors Captured
EC P3-RK Pro Rebuild Kit for Standard Volume(Single Stack)Carburetors Captured
P3-RK EC Pro Rebuild Kit for Single Stack Alky Tillotson (Captured)
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EC P3-RK Pro Rebuild Kit for Standard Volume(Single Stack)Carburetors Captured

Part Number: P3-RK
Online Price: $18.99
EC P3-RK Pro Carburetor Rebuild Kit – .093 Seat & Captured Needle
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Description

EC P3-RK Pro Rebuild Kit for Standard Volume (Single Stack) Tillotson Carburetors – Captured Needle Design


The EC P3-RK Pro Rebuild Kit is a professional-grade carburetor rebuild solution, engineered specifically for standard volume (single stack) Tillotson-style carburetors used in high-performance small engine racing. Built for racers, by racers, this kit features a combination of OE-quality and superior aftermarket components that outperform typical OEM and aftermarket kits in durability, consistency, and throttle response.


Race-Ready Components – No Compromises

Unlike conventional kits that cut corners, the EC Pro Gasket Kits are built to meet the demands of kart racers and performance tuners. This kit includes all essential parts—and then some—such as the Fast Action Main Diaphragm, .093” ID short seat, and captured fulcrum assembly, all designed to withstand harsh racing conditions.


Exclusive Parts Diagram Included

Each Pro Kit includes a comprehensive parts diagram not found in OE or aftermarket kits. This visual reference breaks down the entire Tillotson carburetor, making reassembly easier and ensuring that DIY racers and technicians can confidently rebuild with precision.


Performance Upgrades You Can Feel

At the core of this kit is EC’s proprietary Fast Action Main Diaphragm, designed as a true performance upgrade over OE and aftermarket metering diaphragms. This diaphragm offers:

  • Faster throttle response
  • More consistent fulcrum arm height (thanks to improved dowel alignment)
  • Smoother metal finish for increased durability and tuning accuracy

Also included is a 0.040” High-Volume Fuel Pump Diaphragm Gasket, a popular tech item in kart racing. This allows greater fuel flow for high-demand engines without sacrificing precision.


.093” Alky Seat – Versatile, Not Just for Methanol

The kit includes a short .093” ID seat with cross hole, commonly referred to as the "alky seat." While often used in methanol (alky) applications, this seat is also standard in:

  • Rotary or reed valve 2-cycle kart engines
  • Larger displacement piston port 2-cycle engines
  • High-output 4-cycle gas engines


Captured Fulcrum Arm & Inlet Needle

This kit features a captured-style fulcrum arm and Viton-tipped inlet needle, where the forked arm locks onto the needle’s dowel. This setup is ideal for carburetors mounted with the fuel pump stack facing downward, as it ensures constant needle contact and consistent metering.


Kit Contents

  • Fast Action Main Diaphragm
  • High Volume 0.040” Fuel Pump Diaphragm Gasket
  • 0.006” Fuel Pump Diaphragm
  • Captured Fulcrum Arm
  • Captured Viton Inlet Needle
  • .093” ID Short Seat with Cross Hole (0.532” overall length)
  • Copper Seat Gasket
  • Brass Fuel Strainer Screen
  • Fuel Screen Cork Gasket
  • High/Low Mixture Screw O-Rings
  • 1.00” Flange Gasket
  • 1.060” Flange Gasket
  • 0.375” Welch Plug
  • 0.1875” Cup Plug


Compatibility & Fitment

The EC P3-RK Pro Kit is compatible with any standard volume (single stack, gas) Tillotson-style carburetor that uses:

  • A .093” ID seat
  • Captured fulcrum arm & inlet needle design

Commonly used in high-performance 2-cycle and 4-cycle racing engines.

FAQ

Q1: What carburetors is the EC P3-RK Pro Rebuild Kit compatible with?

A: This kit fits standard volume (single stack) Tillotson-style carburetors that use a .093” seat and a captured-style fulcrum arm and inlet needle. It’s commonly used in high-performance 2-cycle and 4-cycle racing engines.


Q2: What is the difference between the P3-RK and P5-RK kits?

A: The P3-RK includes a .093” ID alky seat, while the P5-RK includes a .062” gas seat. The .093 seat is often used in methanol (alky) applications and larger displacement engines, while the .062 seat is typically for small block gas engines.


Q3: Is the P3-RK only for methanol (alky) fuel setups?

A: No. While the .093” seat is commonly used in methanol applications, it is also widely used in gas-fueled rotary valve, reed valve, and larger piston port 2-cycle engines, as well as large 4-cycle engines.


Q4: What does "captured needle" mean and why does it matter?

A: A captured needle setup features a fulcrum arm that “captures” the dowel on the needle’s head, keeping it securely in contact. This design is preferred for carburetors mounted vertically or facing downward, as it provides more consistent fuel metering under vibration.


Q5: What makes the “Fast Action” Main Diaphragm better than standard versions?

A: EC’s Fast Action Diaphragm improves throttle response, provides more consistent fulcrum height, and features a smoother metal finish for better wear and performance. It outperforms both OE and typical aftermarket diaphragms.


Q6: Does this kit include all the gaskets and parts I need?

A: Yes, the EC P3-RK Pro Kit includes everything required for a full rebuild—including the brass fuel strainer screen, copper seat gasket, high/low mixture o-rings, and more. It’s designed to be more complete than standard OE or aftermarket kits.


Q7: Is a parts diagram included?

A: Yes! Every EC Pro Kit includes a detailed Tillotson carburetor diagram with labeled parts and assembly guidance. This helps ensure accurate reassembly, even for DIY users.


Q8: Can I use this kit for kart racing?

A: Absolutely. This kit was specifically designed with kart racing and other small engine performance applications in mind. It’s ideal for tuners and racers who demand reliability and performance under extreme conditions.

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