The WM80 carburetor repair kit, a two-piece set. A black rubber metering diaphragm, a rectangular flange with six holes, a recessed center, and a metal plate of five round holes around a small pin, sitting in the metering chamber, swelling and contracting to draw fuel, replaced when it hardens, cracks or the holes wear ragged. A dark gray square carburetor gasket, a large center hole plus six bolt holes, seated between the carburetor and the body to seal the joint, replaced when it is squashed, curled or yellowed from weeping. The diaphragm for the fuel path, the gasket for the seal, both swapped in one teardown. On fit, photograph the old parts, press the diaphragm flat with no wrinkles, the plate toward the pump seat, fit the gasket dry with no oil, holes on the studs, screws in diagonally a little at a time. For the WM80 compactor family, with the BS600, BS650 and BS700 checked against the old parts, and fit not guaranteed for every one.

 FAQ 

Q1: What is in this kit?

Two pieces, a black rubber metering diaphragm with a rectangular flange and a metal center plate, and a dark gray square carburetor gasket with a large center hole and six bolt holes, for the WM80 carburetor.

Q2: Which machines does it fit?

The WM80 family compactors, also listed for the BS600, BS650 and BS700 in the same line. Fit is not guaranteed for every machine, so check the flange holes and the gasket holes against your old parts before ordering.

Q3: Do I need to replace both at once?

If you are tearing the carburetor down anyway, yes. The diaphragm handles the fuel path and the gasket handles the seal, and both age, so swapping both in one pass saves a second teardown.