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Tillotson 233-665 Captured Needle, Seat & Gasket Kit
233-665 Tillotson Captured Needle, Seat & Gasket Kit
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Tillotson 233-665 Captured Needle, Seat & Gasket Kit

Part Number: 233-665
Online Price: $8.99
233-665 Tillotson Fuel Inlet Needle, Seat, and Gasket Kit (.093" Alky Seat)
Availability: In Stock.

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Description

233-665 Tillotson Fuel Inlet Needle, Seat, and Gasket Kit – .093" Alky Seat with Captured Needle


The 233-665 Tillotson Fuel Inlet Needle, Seat, and Gasket Kit is a high-flow upgrade commonly used for converting gas carburetors to methanol (alky) or fueling high-performance racing engines. Featuring a .093" fuel seat orifice—the largest in the Tillotson catalog—this kit is engineered for maximum fuel delivery.


While it’s often referred to as an “alky seat,” it’s not limited to methanol use. The 233-665 is also widely used in high-demand gasoline applications, including:

  • Rotary valve and reed valve 2-cycle race engines
  • Large piston port 2-cycle engines
  • Big displacement 4-cycle engines


Key Features:

  • .093" seat orifice – the largest available from Tillotson, ideal for methanol or high-flow gas setups
  • 0.535" seat length – be sure to measure existing hardware for proper fit
  • Captured needle design – maintains continuous contact with the fulcrum lever
  • Includes copper gasket – provides a tight, fuel-sealed fit


Technical Specifications:

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


Application & Installation Notes:

The captured needle is secured by the fork of the fulcrum arm lever, maintaining constant contact throughout operation—this is especially important in carburetors with downward-facing fuel pump stacks.

This kit is ideal for:

  • Methanol conversions
  • High-displacement or high-RPM gas engines
  • Blueprinted or modified Tillotson carburetors

Before installing, always verify the required seat length and orifice size to ensure optimal performance, particularly on custom or racing applications.


Kit Includes:

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


Maximize fuel flow and engine performance with the 233-665 Tillotson Needle, Seat, and Gasket Kit – perfect for methanol conversions and high-performance gas applications.


FAQ

Q1: What engines is the 233-665 Tillotson kit best suited for?

A: The 233-665 kit is ideal for methanol conversions and high-performance gas engines, including rotary valve 2-cycle, reed valve engines, piston port 2-cycles, and large 4-cycle race engines.


Q2: What’s the difference between captured and uncaptured needles?

A: A captured needle is held in place by the fulcrum lever fork and maintains contact during engine operation—making it ideal for setups where the fuel inlet stack faces downward.


Q3: Is this kit only for methanol carburetors?

A: No. While often referred to as an “alky seat,” the .093" seat is also used in high-displacement gas carburetorswhere increased fuel flow is required.


Q4: How do I know if the 233-665 kit fits my carburetor?

A: Measure your existing seat length (0.535") and orifice size (.093") to confirm compatibility—especially important for blueprinted or modified carburetors.


Q5: What is included in the 233-665 kit?

A: This kit includes:

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

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