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EC Tillotson Fulcrum Arm Gauge – Methanol (Alky)
704 EC Tillotson Methanol (Alky) Fulcrum Arm Gauge
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EC Tillotson Fulcrum Arm Gauge – Methanol (Alky)

Part Number: 704-A
Online Price: $10.00
EC Tillotson Fulcrum Arm Gauge – 704 for Methanol Carburetors
Availability: In Stock.

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Description

EC Tillotson Fulcrum Arm Gauge – Methanol (Alky) | 704 Tuning Tool


Dial in precise fulcrum arm height for your methanol-fueled Tillotson carburetor with EC’s 704 Fulcrum Arm Gauge—a must-have tuning tool for serious racers and carburetor builders.

Designed specifically for methanol (alky) applications, this precision tool ensures your carburetor delivers consistent and accurate fuel metering by setting the correct fulcrum arm height, which directly affects fuel flow, diaphragm control, and overall engine performance.


Key Features:

  • Made for Tillotson diaphragm carburetors running on methanol
  • Accurately sets the fulcrum arm height, which determines:
    • Fuel inlet needle movement
    • Fuel flow to low and high-speed circuits
    • Metering diaphragm leverage
  • Helps fine-tune pop-off pressure by altering inlet spring height
  • Precision-machined from durable billet aluminum


Gauge Settings:

  • .075" – Standard baseline for methanol tuning
  • .065" – Common setting for EC Blueprinted Methanol Carburetors (richer fuel curve)


Why Fulcrum Arm Height Matters:

Fulcrum arm height is measured from the gasket surface down to the fulcrum arm. The shorter the distance, the richer the fuel mixture. A setting that’s too high may prevent the inlet needle from fully closing, causing the carburetor to flood.

This gauge ensures:

  • Proper fuel metering
  • Consistent engine response
  • No flooding or lean condition due to incorrect arm height


Whether you’re rebuilding a methanol Tillotson carb or chasing peak performance on race day, the EC 704 Fulcrum Arm Gauge ensures you get your tuning right—every time.

FAQ

What is the EC 704 Fulcrum Arm Gauge used for?

This tool is used to set the fulcrum arm height in Tillotson diaphragm carburetors running on methanol fuel. It helps ensure proper diaphragm control and fuel metering.


What are the two settings on the gauge?

The 704 Gauge features:

  • .075” – Standard methanol carb baseline
  • .065” – Common setting for EC Blueprinted Methanol Carburetors for a richer fuel curve


Why is fulcrum arm height important in methanol carbs?

It controls the leverage of the metering diaphragm over the inlet needle, affecting how much fuel can pass into the circuits. Incorrect height can lead to flooding, lean conditions, or tuning issues.


Can this gauge be used for gasoline carbs?

No. The 704 Gauge is specifically designed for methanol carburetors. For gas setups, use the EC 705-G Fulcrum Arm Gauge.


How often should fulcrum arm height be checked?

It should be checked during every rebuild and before competitive use, especially in high-performance or racing environments.

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