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Tillotson 34-221 Uncaptured Inlet Needle
34-221 Tillotson Uncaptured Inlet Needle
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Tillotson 34-221 Uncaptured Inlet Needle

Part Number: 34-221
Online Price: $4.99
Tillotson 34-221 Uncaptured Inlet Needle for Upward Pump Stack Carburetors
Availability: In Stock.

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Description

Tillotson 34-221 Uncaptured Inlet Needle – OEM for 4-Cycle Carburetors


Reliable Fuel Control for Upward-Facing Pump Stack Carburetors

The Tillotson 34-221 Uncaptured Inlet Needle is a genuine OEM fuel control component designed for use in Tillotson carburetors with upward-facing pump stack plates, typically found on 4-cycle racing engines. Unlike captured needles, this version does not include a dowel pin—instead, the fulcrum arm rests directly on top of the needle head to control fuel flow into the metering chamber.


This configuration allows for smoother needle response across a variety of racing conditions, including both rough and smooth tracks, making it a preferred choice in many 4-cycle karting applications. It provides precise fuel regulation to maintain consistent performance at both idle and full throttle.


Key Features:

  • Part Number: 34-221
  • Needle Type: Uncaptured
  • Compatible With: Tillotson carburetors (check pump plate orientation)
  • Best For: 4-cycle racing engines
  • Application: Use with upward-facing pump stacks
  • Fuel Compatibility: Gasoline and methanol (depends on seat used)


Avoid Aftermarket Failures

Poor-quality aftermarket inlet needles are one of the most common causes of flooding and idle issues after carburetor rebuilds. These needles often fail to seat properly, causing fuel to leak past the inlet seat—especially from the high-side circuit. To avoid tuning problems, always pair this needle with a matched OEM seat and verify pop-off pressure using a pressure gauge during installation.


Fitment Note:

Always consult your Tillotson carburetor model number and configuration before ordering. The 34-221 uncaptured needle is not compatible with captured fulcrum setups or downward-mounted pump stacks.

FAQ

Q1: What does “uncaptured” mean in an inlet needle?

A: It means the fulcrum arm rests on top of the needle without capturing it via a dowel or stem—ideal for upward-facing pump stacks.


Q2: What engines use the 34-221 inlet needle?

A: It’s commonly used in 4-cycle kart racing engines with Tillotson carburetors mounted upright.


Q3: What’s the difference between captured and uncaptured needles?

A: Captured needles are held by a dowel and are best for downward-facing stacks; uncaptured ones like the 34-221 are suited for upward-facing configurations.


Q4: Can I use this needle in methanol setups?

A: Yes, as long as it’s paired with a compatible methanol-rated seat.


Q5: Why avoid aftermarket inlet needles?

A: Many fail to seal properly, causing fuel leaks or flooding at idle. Use OEM needles and always test pop-off pressure.

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