MOTOALL Carburetor Leak Detector for Walbro 57-21 — 0–100 kPa Analog Gauge, ZAMA ZPG-2 Replacement

The MOTOALL Carburetor Leak Detector is a handheld gauge built to find leaks in Walbro and compatible 2‑cycle carburetors quickly and accurately.

This compact tester is designed for small-engine technicians, landscapers, and DIY mechanics who service handheld equipment. It directly fits Walbro 57-21 style assemblies and Stens 705-020, measures vacuum/pressure from 0 to 100 kPa (0–15 psi), and serves as a drop‑in replacement for ZAMA ZPG-2 and Tillotson 243-504 models. The tool helps you pinpoint diaphragms, gaskets, and needle‑seat problems without removing the carburetor from the engine in many cases.

How does the gauge identify carburetor leaks?

The tester applies controlled vacuum or pressure to the carburetor’s diaphragm chambers and shows the resulting pressure on a clear analog dial. A steady drop indicates a leak path; stable readings mean seals and diaphragms are holding. Readings across the 0–100 kPa range let you detect minor leaks that affect performance.

• Analog dial with clear markings from 0 to 100 kPa (0–15 psi)
• Connects to Walbro 57-21 pattern ports and compatible fittings
• Detects diaphragm, gasket, and passage leaks quickly

What engines and carburetors will this tester work with?

The tester is intended for two‑cycle carburetors that follow the Walbro 57‑21 port arrangement and similar designs. It directly fits Walbro 57‑21 units, Stens 705‑020, and compatible Zama/Tillotson patterns. Always confirm port layout before use; adapters or slight modifications may be necessary for nonstandard bodies.

• Direct fit: Walbro 57‑21 series
• Compatible: Stens 705‑020
• Replaces: ZAMA ZPG‑2 and Tillotson 243‑504 testers

How do I use the MOTOALL leak detector safely and effectively?

Attach the tester to the carburetor port while the carburetor is removed or safely separated from fuel and ignition sources. Apply vacuum or light pressure gradually and watch the dial for any change; compare against expected hold times. Work in a well‑ventilated area and keep fuel away from the tool during diagnostics.

• Remove carburetor or isolate from fuel/ignition first
• Connect securely to the diaphragm port or adapter
• Apply pressure slowly and observe dial behavior

What maintenance and durability can I expect?

The unit is made for workshop use and routine diagnostic checks. Rinse or wipe clean after exposure to grime; store in a dry place out of direct sunlight. The analog gauge mechanism is robust, but avoid dropping or striking the face to maintain accuracy.

• Wipe clean; avoid solvents that damage seals
• Store dry and protected from impact
• Replace if needle binding or leaks develop in the tester itself

Who is this for: The MOTOALL Carburetor Leak Detector is for small‑engine mechanics, landscape maintenance professionals, and hobbyists who repair chainsaws, trimmers, blowers, and other two‑cycle equipment. If you need a straightforward, compatible replacement for ZAMA ZPG‑2 or Tillotson 243‑504 testers that covers Walbro 57‑21 pattern carburetors and provides 0–100 kPa diagnostic range, this tool delivers a practical, workshop-ready solution.