Makita 5506001040 — original Makita carburetor diaphragm / gasket pack. This small, flexible diaphragm and gasket set is made to replace worn or cracked carburetor/pump membranes on Makita petrol brushcutters, restoring reliable fuel metering, primer / pump action and clean starting.

Fits example models: Makita RBC525

Key details

- Part number: 5506001040 — listed as the diaphragm / “diaphragm packing” for the carburetor assembly.

- Function: replaces the metering / pump diaphragm and associated gasket(s) inside the carburetor to stop fuel leaks, poor idle, hard starting or loss of power caused by aged diaphragms.

- Installation: small, thin gasket / diaphragm layers that sit inside the carburetor body and primer / pump cavity; fits directly into the factory carburetor location listed on Makita parts diagrams.

Why this part helps: over time the rubber membrane hardens or tears and the fuel pump / metering functions become unreliable — replacing the diaphragm pack is a common, low-cost repair that returns engine responsiveness and makes the tool start and idle correctly again.

(Part shown and referenced in Makita parts listings for the  RBC525 .)