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Tillotson 233-669 Uncaptured Needle, Seat & Gasket Kit
233-669 Tillotson Uncaptured Needle, Seat & Gasket Kit
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Tillotson 233-669 Uncaptured Needle, Seat & Gasket Kit

Part Number: 233-669
Online Price: $9.20
233-669 Tillotson Fuel Inlet Needle, Seat, and Gasket Kit (.093" Alky Seat)
Availability: In Stock.

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Description

233-669 Tillotson Fuel Inlet Needle, Seat, and Gasket Kit – .093" Alky Seat for Methanol or High-Flow Gas Applications


The 233-669 Tillotson Fuel Inlet Needle, Seat, and Gasket Kit is a high-flow fuel seat upgrade designed for methanol conversions or high-displacement racing engines. Commonly referred to as an “alky seat,” this kit features the largest fuel inlet orifice (.093") available in the Tillotson lineup—making it ideal for demanding fuel delivery needs.


Often used to convert gas carburetors to methanol, this seat is also popular in:

  • Rotary valve and reed valve 2-cycle racing engines
  • Big-bore piston port 2-cycle engines
  • High-output 4-cycle kart engines

Whether you're building a methanol-fueled kart or a performance gas engine with high RPMs and displacement, this seat is built to handle extreme fuel demand.


Key Features:

  • .093" seat orifice – Tillotson’s largest, designed for maximum fuel flow
  • 0.535" seat length – be sure to verify measurements before installation
  • Uncaptured needle design – ideal for 4-cycle engines with upward-facing fuel inlets
  • Includes copper gasket – for secure, leak-free sealing


Technical Specs:

  • Seat Orifice: 0.093"
  • Seat Length: 0.535"
  • Needle Type: Uncaptured
  • Gasket: 16B-199 Copper Seat Gasket


Compatibility & Installation Notes:

This kit is commonly used when converting Tillotson gas carburetors to run methanol, thanks to its high-flow capabilities. However, it's also used in large gas engines where increased fuel volume is critical. Always measure your current seat’s length and orifice before replacing—especially on blueprinted, modified, or racing engines.


The uncaptured needle in this kit is designed for carburetors with upward-facing fuel stacks, where the fulcrum lever rests directly on the top of the needle, rather than capturing it with a fork.


Kit Includes:

  • One .093" fuel inlet seat (0.535" length)
  • One uncaptured fuel inlet needle
  • One 16B-199 copper seat gasket


Boost your engine's fuel delivery and unlock performance potential with the 233-669 Tillotson Fuel Inlet Needle, Seat, and Gasket Kit – the go-to choice for methanol conversions and high-demand racing setups.

FAQ

Q1: What is the 233-669 Tillotson kit used for?

A: This kit is primarily used for converting gas Tillotson carburetors to run on methanol. It’s also ideal for high-performance engines requiring higher fuel flow, such as large 2-cycle or 4-cycle racing engines.


Q2: What makes the .093" seat special?

A: The .093" seat in this kit has the largest orifice available in the Tillotson catalog, allowing for maximum fuel delivery—perfect for methanol-fueled engines or gas engines with high RPM and displacement.


Q3: What is the difference between a captured and uncaptured needle?

A: This kit includes an uncaptured needle, meaning the fulcrum lever rests on top of the needle rather than holding it in place. It’s commonly used in 4-cycle engines where the fuel inlet faces upward.


Q4: Will this kit fit my Tillotson carburetor?

A: Check the required seat orifice size (.093") and seat length (0.535") for your carburetor model. It's essential to verify dimensions—especially for modified or blueprinted engines.


Q5: What comes in the 233-669 kit?

A: This kit includes:

  • One .093" high-flow fuel inlet seat (0.535" length)
  • One uncaptured fuel inlet needle
  • One 16B-199 copper seat gasket






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