EMPI Carburetor Synchrometer Pro-Sync Squarrle-Cage for Dune Buggies & VW — Non-Restrictive, Dual-Adapter

The EMPI Pro-Sync Carburetor Synchrometer is a precision squarrle-cage style tool that visually balances dual carburetors for smoother engine idle and even throttle response.

If you tune classic air-cooled engines, dune buggies, VW Beetles, Karmann Ghia, VW buses, or motorcycle trikes, matching carburetor airflow is essential. The EMPI 43-5712 Pro-Sync offers a universal, non-restrictive method to compare intake flow between multiple carburetors. It uses a clear, easy-to-read scale and ships with two adapters so you can work with both down-draft and side-draft setups without swapping tools.

How does the Pro-Sync make carb tuning faster and more accurate?

The Pro-Sync gives a visual reading of relative airflow so you can adjust each carburetor until the indicators align. Because it doesn't block the intake, readings reflect real operating conditions and let you fine-tune instead of guessing. The numbered 1–30 kg/h scale helps you reproduce settings and verify consistency across cylinders.

• Clear squarrle-cage visual indicator for side-by-side comparison
• Non-restrictive throat preserves normal airflow during measurement
• Numbered scale (1–30 kg/h) for repeatable adjustments

Which carburetor types and vehicles will this tool work with?

The kit supports both down-draft and side-draft carburetors, covering most classic VW and small-engine applications. Two included adapters expand compatibility so one tool handles multiple flange sizes and orientations. It's intended for universal, small-displacement engines rather than modern fuel-injected systems.

• Includes two adapters for different carburetor fittings
• Compatible with many VW, dune buggy, and motorcycle trike setups
• Works on both down-draft and side-draft carburetors

What practical results can I expect after synchronizing with this device?

A properly synchronized multi-carb setup reduces rough idle, evens throttle response, and helps you achieve smoother acceleration. While this tool doesn't alter jetting or engine timing, it ensures each carburetor contributes the same airflow, making subsequent tuning steps more effective. Results depend on the rest of the ignition and fuel system being in good condition.

• Smoother, more consistent idle across cylinders
• Even throttle response during partial and steady throttle openings
• Clear baseline for further carburetor adjustments and jetting

How simple is it to use for a home mechanic?

The Pro-Sync is designed for straightforward, hands-on use: attach the adapter, clamp or hold the cage over the intake, then read and equalize the indicators while adjusting throttle linkages. No complex electronics or calibration is required, making it suitable for backyard mechanics and professional shops alike. Its compact form fits in most toolboxes for field tuning.

• Quick attach adapters make setup fast
• Visual scale eliminates the need for electronic gauges
• Portable and durable for shop or roadside use

Who is this for: The EMPI Pro-Sync is aimed at classic car enthusiasts, dune buggy owners, VW restorers, and small-engine mechanics who want a reliable, visual way to balance multiple carburetors. If you work on dual or multiple carb setups and need a repeatable, affordable sync method that won’t interfere with normal airflow, this tool is a practical addition to your tuning toolkit.