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Tillotson RK-1HW OEM Single Stack Rebuild Kit
Tillotson RK-1HW OEM Single Stack Repair Kit
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Tillotson RK-1HW OEM Single Stack Rebuild Kit

Part Number: RK-1HW
Online Price: $35.00
Tillotson RK-1HW OEM Rebuild Kit for HW-Series Standard Volume (Single-Stack) Carburetors
Availability: In Stock.

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Description

Tillotson RK-1HW OEM Rebuild Kit for HW-Series Standard Volume (Single-Stack) Carburetors


The Tillotson RK-1HW OEM Rebuild Kit is a genuine factory service kit designed specifically for HW-series standard-volume, single-stack carburetors. These carburetors are commonly used on high-performance 2-cycle engines such as the IAME X30, as well as other Tillotson HW applications. This kit provides the correct OEM diaphragms, gaskets, needle, and seat needed to restore precise fuel delivery and maintain peak carburetor performance.


The RK-1HW serves as a direct OEM alternative to the discontinued RK-6HW kit. While the RK-6HW used orange/red “spec” gaskets, the RK-1HW utilizes the standard black OEM Tillotson gaskets, offering the same factory fit and reliable performance.


Why Choose the RK-1HW for Your Tillotson HW Carburetor?

?Designed for Standard-Volume (Single-Stack) HW Carburetors

The RK-1HW fits HW carburetors that use a single fuel pump stack, which includes:

  • Two aluminum pump plates
  • Standard-volume fuel pump design

These components are not interchangeable with HW high-volume “double-stack” (alky) pumps, making this kit the correct choice for standard HW units.


High-Quality .004" Teflon-Laminated Pump Diaphragm

The included .004" Teflon-laminated pump diaphragm is ideal for small-displacement and high-RPM 2-cycle engines. It improves responsiveness and fuel metering while resisting warping and degradation from race fuels.


Precision Needle, Seat, and Fulcrum Assembly

The RK-1HW features a captured-style fulcrum arm and needle, ensuring consistent fuel control and preventing needle bounce at high RPM.

  • Includes a .093” short inlet seat for improved flow
  • Prevents fuel starvation under load
  • Ideal for performance and competition applications

Smaller seats (like .062") commonly found in non-OEM kits cannot supply the same volume and may limit performance.


Correct OEM Gasket Thickness

Tillotson HW carburetors rely heavily on the proper diaphragm and gasket thicknesses. This kit includes the standard .030" diaphragm gasket, suitable for most HW models. Some modified engines may require a .040" gasket—consult your builder if unsure.


What’s Included in the RK-1HW Kit?

  • Main metering diaphragm
  • Main diaphragm gasket
  • .004” Teflon-laminated fuel pump diaphragm
  • .030” fuel pump diaphragm gasket
  • Captured-style needle
  • Captured fulcrum arm
  • Short fuel inlet seat (.093” bore, 0.530” length)
  • Inlet seat gasket


Compatible Carburetors and Engines

Tillotson Carburetors:

  • HW-27A
  • HW-47A
  • Most standard-volume HW-Series Tillotson carburetors


Engines Commonly Using HW-Series Carbs:

  • IAME X30
  • Other 2-cycle racing engines using HW-series carburetors


Why Use Genuine OEM Tillotson Parts?

  • Exact Fit & Calibration: Ensures compliance with racing specs and factory fuel-metering profiles.
  • Consistent Tuning: OEM materials maintain their shape and elasticity far longer than aftermarket imitations.
  • Performance Confidence: Maximizes throttle response, fuel delivery, and long-term reliability under racing conditions.
  • Avoid Compatibility Issues: Many aftermarket HW rebuild kits mix parts for single-stack and double-stack carbs—OEM avoids these mismatches entirely.

FAQ

1. What carburetors does the Tillotson RK-1HW rebuild kit fit?

The RK-1HW kit fits standard-volume, single-stack HW-Series Tillotson carburetors, including the HW-27A, HW-47A, and similar models used on engines like the IAME X30.


2. How do I know if I have a standard-volume (single-stack) carburetor?

Single-stack HW carburetors use two aluminum pump plates in the fuel pump stack. If your carb uses three plates, you have a high-volume “double stack” pump and need a different kit.


3. What is the difference between RK-1HW and RK-6HW?

The RK-1HW uses standard black Tillotson gaskets, while the RK-6HW used red/orange spec gaskets. Both function the same, and RK-1HW is the standard non-spec OEM replacement.


4. Does this kit include the correct needle and seat?

Yes. The RK-1HW includes a captured needle and fulcrum arm paired with a .093” high-flow short seat, preventing fuel starvation during racing conditions.


5. Can this rebuild kit be used on modified or high-performance engines?

Yes—many modified 2-cycle engines, including the IAME X30, rely on HW carburetors. However, always confirm gasket thickness requirements (.030 vs .040) with your engine builder.


6. Does this kit work on double-stack or alcohol (alky) carbs?

No. The RK-1HW is only for standard-volume single-stack HW carburetors. Double-stack or alky carbs require different diaphragm and gasket sets.


7. What diaphragm material is included?

This kit includes the OEM .004” Teflon-laminated pump diaphragm, ideal for precise metering in high-RPM small displacement engines.


8. Are OEM parts better than aftermarket rebuild kits?

Yes. OEM Tillotson components maintain correct fuel metering, gasket thickness, seat sizing, and diaphragm stiffness, ensuring consistent tuning and superior performance.

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