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EC Walbro Methanol (Alky) Service Kit
702 EC Walbro Methanol (Alky) Service Kit
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EC Walbro Methanol (Alky) Service Kit

Part Number: 702-K
Online Price: $59.98
EC Walbro Diaphragm Carburetor Service Kit – Methanol (Alky)
Questions about this item? Be the first to ask here.
Availability: Out of Stock.

Description

EC Walbro Diaphragm Carburetor Service Kit – Methanol (Alky) | Rebuild & Tuning Kit for WA/WB Carbs


Get the tools you need to rebuild and precisely tune your Walbro diaphragm carburetor for methanol (alky) fuel with the EC 702 Walbro Service Kit. Whether you're preparing for race day or refreshing your carb after a long season, this all-in-one kit ensures your fuel system delivers consistent, high-performance results.


Kit Includes:

POPG-1 Pop-Off Pressure Gauge (0–15 psi)

A must-have for every carb builder or racer, this gauge allows you to:

  • Accurately measure pop-off pressure (typically 8.5–10 psi for EC alky carbs)
  • Check for internal leaks that can cause hard-to-diagnose rich conditions or flooding
  • Improve low-speed fuel delivery by fine-tuning spring tension
  • Ensure stable fuel flow for more predictable throttle response

While pop-off pressure doesn’t directly set fuel pressure, it controls fuel volume at lower speeds, which is critical for reliable carburetor operation in racing conditions.


707 EC Fulcrum Arm Gauge – Methanol

Set the fulcrum arm height with precision using this dual-setting gauge, made specifically for Walbro diaphragm carbs used with methanol fuel.

  • .075” – Standard baseline for methanol carburetors
  • .065” – EC’s blueprint spec for richer fuel metering

The fulcrum arm height determines how much leverage the metering diaphragm has on the inlet needle, directly affecting fuel flow to the high and low side circuits. It can also slightly influence pop-off pressure based on spring height and fulcrum arm position.

EC’s blueprinting team sets most methanol carburetors using the .065” side for optimized fuel delivery under race conditions.


Designed For:

  • Walbro WA, WB, and similar diaphragm carburetors
  • High-performance methanol/alky-fueled engines
  • Kart racers, engine builders, and tuners
  • Routine carb maintenance, rebuilds, and pre-race prep


The EC 702 Walbro Methanol Service Kit gives you the precision tools needed to ensure your diaphragm carb is race-ready—reliable, responsive, and perfectly tuned.

FAQ

What does the EC 702 Walbro Service Kit include?

The kit includes:

  • POPG-1 0–15 psi Pop-Off Gauge for measuring pop-off pressure and checking for leaks
  • 707 Fulcrum Arm Gauge (Methanol) with .075" and .065" settings for setting correct fulcrum arm height


Why is pop-off pressure important in methanol carb tuning?

Pop-off pressure controls fuel volume at lower speeds. For methanol carbs, this is especially important to avoid flooding and maintain consistent low-end performance. EC recommends 8.5–10 psi for most alky setups.


What is the correct fulcrum arm height for methanol-fueled Walbro carbs?

Standard methanol tuning uses .075”, but EC’s Blueprinted Methanol Carburetors typically use .065” for a richer fuel setting. This measurement is taken from the gasket surface down to the arm.


Can I use this kit on gas-fueled carburetors?

This kit is specifically designed for methanol/alky-fueled Walbro WA/WB carburetors. EC offers a separate service kit tailored for gasoline applications.


How often should I use the tools in this kit?

Check and adjust pop-off pressure and fulcrum arm height during every rebuild. Racers often verify settings before each race for maximum reliability and performance.


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