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EC Walbro Methanol (Alky) Fulcrum Arm Gauge
707 EC Walbro Methanol (Alky) Fulcrum Arm Gauge
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EC Walbro Methanol (Alky) Fulcrum Arm Gauge

Part Number: 707-A
Online Price: $10.00
707 Walbro Fulcrum Arm Gauge – Methanol Carb Tuning Tool
Availability: In Stock.

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Description

707 Walbro Fulcrum Arm Gauge – Methanol (Alky) | Precision Tool for Methanol Carburetor Tuning


Ensure precise fuel metering for your methanol-fueled Walbro carburetor with EC’s 707 Fulcrum Arm Gauge.Designed for serious racers and carburetor builders, this essential tuning tool helps set the correct fulcrum arm height in Walbro diaphragm carburetors (WA, WB, etc.) configured for methanol (alky) fuel applications.


This high-quality billet aluminum gauge is engineered with two specific settings for methanol tuning, allowing you to dial in your fuel delivery system for optimal performance, consistency, and reliability.


Key Features:

  • Precision Fulcrum Arm Gauge for Methanol Tuning
  • Compatible with Walbro WA, WB, and similar diaphragm carbs
  • Two Gauge Settings:
    • .075" – Standard baseline for methanol carburetors
    • .065" – For EC Blueprinted Methanol Carburetors (richer setting)
  • CNC-machined billet aluminum – Durable and easy to use
  • Essential for racers and small engine tuners working with methanol setups


Why Fulcrum Arm Height Matters:

The fulcrum arm height controls how much leverage the metering diaphragm has on the fuel inlet needle. This directly affects fuel flow to the high and low-speed circuits, impacting throttle response, fuel delivery, and overall engine performance.


A lower fulcrum arm measurement (shorter distance) results in a richer fuel setting, too short(if the fulcrum arm is too close or touching the main metering diaphragm) can cause flooding if the needle doesn’t seat properly. This adjustment also influences pop-off pressure by altering the tension spring installation height.


Gauge Settings Explained:

  • .075” – Standard methanol tuning setting
  • .065” – EC Blueprinted Methanol setting (for richer tuning)

Measurements are taken from the gasket surface down. If the fulcrum arm is too high, it may prevent the inlet needle from sealing, leading to uncontrolled fuel flow and flooding.


Whether you're rebuilding after every race or tuning for peak performance, the EC 707 Fulcrum Arm Gauge gives you the accuracy and confidence needed to stay ahead of the competition.

FAQ

What is the EC 707 Fulcrum Arm Gauge used for?

The EC 707 Gauge is used to accurately set the fulcrum arm height on Walbro WA/WB diaphragm carburetors that are tuned for methanol fuel. It ensures proper fuel metering and prevents flooding or lean conditions.


What are the two settings on the gauge?

  • .075” – Standard baseline setting for methanol carburetors
  • .065” – Used in EC Blueprinted Methanol Carburetors for a richer fuel curve


Why does fulcrum arm height matter in methanol tuning?

Fulcrum arm height determines how much the metering diaphragm can press on the inlet needle. A proper setting ensures the engine receives the correct amount of fuel, especially under high-load racing conditions. Incorrect height can lead to inconsistent performance, flooding, or fuel starvation.


How is fulcrum arm height measured?

It’s measured from the carburetor body’s gasket surface down to the top of the fulcrum arm. A shorter distance equals a richer setting.


How often should I check or adjust fulcrum arm height?

Check the fulcrum arm height during every rebuild, and ideally before every race, especially in methanol applications where fuel flow characteristics are more sensitive.

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