EMPI Carburetor Synchrometer Squarrle Cage Style — 1–30 kg/h Scale, Dual-Adapter

EMPI Pro-Sync Carburetor Synchrometer is a precision visual tool that balances dual or multiple carburetors without obstructing airflow.

Keep your dune buggy, VW Beetle, Karmann Ghia, VW Bus or motorcycle trike running smoothly with a straightforward, mechanical method for matching carburetor airflow. The EMPI 43-5712 Squarrle Cage style synchronizer uses a clear numbered scale and two adapters to cover both side-draft and down-draft applications. It’s built to provide consistent, repeatable results during tuning sessions and to speed up the process of equalizing intake flow across multiple carburetors.

How does this tool show carburetor imbalance?

The Pro-Sync uses a small, lightweight cage that sits in each carburetor throat and displays airflow differences on a visible 1–30 kg/h scale. When readings are different between carburetors, you can adjust throttle linkage or needles until the indicators match. Because the device does not significantly restrict airflow, readings reflect real operating conditions rather than altered flow.

• Visible 1–30 kg/h numbered scale for quick comparison
• Non-restrictive design preserves true airflow during testing
• Direct visual feedback makes balancing intuitive

Which engines and carburetor types will it work with?

EMPI’s Pro-Sync is engineered for versatility: it fits a wide range of side-draft and down-draft carburetor configurations found on classic VWs, dune buggies and many small-displacement engines. The kit includes two adapters to help seal different throat sizes so one tool can serve multiple vehicles. If your setup uses simultaneous carburetors or twin carbs, this tool simplifies matching them quickly.

• Compatible with side-draft and down-draft carburetors
• Includes two adapters for broader throat compatibility
• Works on dual and multi-carb setups commonly found in VW and dune buggy builds

What makes the Pro-Sync more accurate or user-friendly than improvised methods?

Unlike airflow meters that block the intake, the Pro-Sync design minimizes interference while giving a clear numeric readout. The lightweight cage responds rapidly to changes so small adjustments are easy to verify. No special tools or electronics are required—just the synchronizer, adapters, and basic tuning know-how.

• Quick, repeatable readings without electronics
• Easy-to-read numerical scale for precise adjustment
• Two adapters reduce the need for multiple tools or custom fixtures

How should I use it during a tuning session?

Install an adapter and insert the synchrometer into one carb throat at a time, note the scale reading, then adjust linkages until each carb shows the same value. Work with the engine at the idle or a stable RPM recommended by the vehicle’s service manual. Recheck after a short run-in to confirm stability and repeat adjustments if necessary.

• Insert cage with appropriate adapter, read scale, adjust linkage
• Perform checks at stable idle or specified RPM
• Re-verify readings after short engine run to ensure consistency

Who is this for: EMPI’s Carburetor Synchrometer is aimed at owners and mechanics who maintain air-cooled VWs, dune buggies, kit cars, and small-displacement motorcycles or trikes. It’s especially useful for DIY tuners, restoration shops, and race teams who need a compact, reliable tool to balance multiple carburetors quickly and without complicated electronics. If you want a repeatable, mechanical way to improve throttle response and smoothness through matched airflow, this Pro-Sync kit is a practical addition to your garage tools.