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Lowside/Epa Jet for Tillotson PK-1/Hyuai Carburetors (Choose Size)
308080038 Lowside/Epa Jet for Tillotson PK-1 Carburetors
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Lowside/Epa Jet for Tillotson PK-1/Hyuai Carburetors (Choose Size)

Part Number: 308080038-
Online Price: $3.00
OEM Tillotson Low Side EPA Jet for PK-1 Carburetors – Idle & Acceleration Tuning
Availability: In Stock.

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Description

OEM Tillotson Low Side / EPA Jet for PK-1 Carburetors – Choose Your Size


Fine-tune your idle and low-speed performance with this OEM low-side (EPA) jet designed specifically for the Tillotson PK-1A, PK-1B, and PK-3A clone carburetors. This jet controls the fuel delivery at idle and low RPM, playing a critical role in engine responsiveness during throttle tip-in and acceleration.


Fitment Note:
This jet is exclusive to Tillotson PK-1 series carburetors, Hyuai and is not compatible with Ruixing or other clone carburetor models. Ruixing carbs require a different low-side/EPA jet type and thread.


Tuning Guide

Unlike the main jet—which controls fuel at wide-open throttle—the low side jet affects idle quality, part-throttle response, and acceleration from a stop. Your application will determine the best size range:

Racing Applications

  • Use Jet Sizes: .028–.034
  • Purpose: Optimized for off-the-line acceleration.
  • Note: This may cause a rough idle and can foul plugs if left idling too long.
  • Tuning Tip:
    • If the engine bogs, then surges forward, you're likely too rich—go down a size.
    • If it feels flat or unresponsive, you're likely too lean—go up a size.

Recreational Use (Mini Bikes, Yard Karts)

  • Use Jet Sizes: .019–.022
  • Purpose: Balanced for smooth idle and improved part-throttle power.
  • Recommended For: Engines that need to idle well or run cleanly at low speeds.


Special Note on Tillotson PK-1A Carbs

The PK-1A version comes from the factory with a richer low-speed calibration. You may need to use smaller low jets than expected to achieve proper idle and low-speed tuning. Always start at the lower end of the recommended range and tune up or down based on performance.


Compatibility:

  • Tillotson PK-1A, PK-1B, PK-13A and Hyuai Clone Carburetors


What’s Included:

  • (1) Tillotson Low Side / EPA Jet – Choose size from dropdown

FAQ

Q1: What engines use the Tillotson PK-1 low side/EPA jet?
A: This jet fits Tillotson PK-1A, PK-1B and PK-3A clone carburetors, found on Tiillotson 196cc and 212cc engines


Q2: Can I use this low side jet on Ruixing clone carburetors?
A: No, Ruixing carburetors require a different style of low side/EPA jet. This jet is specifically designed for Tillotson PK-1 clone carburetors only.


Q3: How do I choose the correct low side jet size?
A: For racing and better acceleration, use sizes from .028 to .034, but expect a rough idle. For smoother idle and recreational use, sizes from .019 to .022 are recommended. Always start with the smaller size and tune based on engine response.


Q4: What happens if the low-side jet is too rich or too lean?
A: If too rich, the engine may bog when accelerating but then surge forward; reduce jet size. If too lean, acceleration may be sluggish or flat; increase jet size.


Q5: Does the PK-1A carburetor require a different tuning approach?
A: Yes, the PK-1A comes richer from the factory, so you may need to use smaller low side jets to achieve proper idle and performance.


Q6: How does the low side jet affect engine performance?
A: The low side jet controls fuel delivery at idle and low throttle positions, affecting idle quality, throttle response, and low-speed acceleration.

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