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Tillotson RK-103HL HL/HR OEM High Volume(Double Stack) Rebuild Kit
RK-103HLR OEM Tillotson Complete Rebuild Kit
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Tillotson RK-103HL HL/HR OEM High Volume(Double Stack) Rebuild Kit

Part Number: RK-103HL
Online Price: $18.29
Tillotson RK-103HLR OEM Rebuild Kit – HL & HR High Volume Carburetors
Availability: Out of Stock.

Description

Tillotson RK-103HLR OEM Rebuild Kit – High Volume (Double Stack) HL & HR-Series Carburetors


The Tillotson RK-103HLR Rebuild Kit is a genuine OEM service kit built specifically for high-volume, double-stack HL and HR-series carburetors. This kit is trusted by top-level racers and engine builders for its ability to restore reliable fuel delivery, crisp throttle response, and airtight diaphragm performance in high-demand racing environments—particularly those using methanol fuel.


Why Choose the RK-103HLR?

High-Volume Double Stack Compatibility

The RK-103HLR is engineered for 3-plate aluminum pump stack carburetors, often referred to as double stack, alky plates, or double pumper carbs. These are commonly used in performance 2-cycle and 4-cycle engines, including methanol-fueled karts, drag minibikes, and flat kart racing applications.

Not compatible with standard 2-plate (single-stack) fuel pump designs. Gaskets and diaphragms are not interchangeable between stack types.


Optimized Fuel Flow for Methanol Applications

Includes a .093” short fuel inlet seat with cross-hole, paired with a captured (forked) fulcrum arm and needle valve.This setup delivers consistent high-volume fuel flow—critical for methanol carburetor tuning.


OEM Precision & Durability

Tillotson OEM parts are built to exact specifications with premium materials that resist fuel swelling, ethanol degradation, and wear—ensuring longer service life and better carburetor performance compared to generic kits. Perfect for competition and endurance events.


Kit Contents:

  • Main Diaphragm
  • Main Diaphragm Gasket
  • Fuel Pump Diaphragm
  • Fuel Pump Diaphragm Gasket
  • Inlet Valve Diaphragm
  • Inlet Valve Diaphragm Gasket
  • Fuel Strainer Cork Gasket
  • .530” Fuel Inlet Seat (.093” bore with cross-hole)
  • Copper Seat Gasket
  • Captured Inlet Needle
  • Captured Fulcrum Arm (Forked)
  • .500” Welch Plug
  • (2) .375” Welch Plugs
  • 1.00” HL Flange Gasket
  • 1.380” HR Flange Gasket


Compatible With:

  • Most Tillotson HL-Series and HR-Series carburetors featuring high-volume (3-plate) pump stacks
  • Ideal for methanol-fueled setups and engines requiring enhanced fuel delivery


Recommended Upgrades:

For increased performance and race-day tuning flexibility, upgrade to one of our EC Pro Kits:

  • P8-MRK – for HL-Series High Volume Carburetors
  • P7-RK or P7-MRK – for HR-Series High Volume Carburetors

Always confirm your carburetor model and race regulations before ordering.

FAQ

Q1: What’s the difference between the RK-103HLR and RK-104HL?

While both are for double stack (3-plate) carburetors, the RK-103HLR includes gaskets for both HL and HR flanges, and features a captured needle/arm setup, whereas the RK-104HL often includes an uncaptured needle setup.


Q2: Can I use this kit on a single-stack (2-plate) HL carburetor?

No. The RK-103HLR is built exclusively for high-volume (3-plate) carburetors. It is not compatible with single-stack setups.


Q3: Is this kit compatible with methanol?

Yes. It is built specifically for methanol-tuned racing carburetors, with fuel-resistant diaphragms and a high-flow .093" inlet seat.


Q4: What type of engines is this kit ideal for?

This rebuild kit is perfect for high-performance 2-stroke and 4-stroke racing engines, especially in karting, minibikes, and small-engine drag racing running methanol or other high-octane fuels.

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