Before setting the diaphram down on your workbench, invert the diaphram so it looks like a mushroom. This prevents the diaphram from taking any unnecessary abuse while outside the carburetor. To clean the diaphragm assembly, spray cleaner on a shop rag and wipe off any varnish. Try to avoid spraying cleaner on the diaphragm as it is made from rubber and the abrasive cleaner can destroy it. The plate can be removed by backing out the two Phillips screws that hold the plate in place. This is the most important step. The screws are staked, meaning the tips of the screws were widened so they keep a tight fit to the shaft. If you can’t find a tight fitting screwdriver, avoid this step so you don’t strip out the screws — and use spray cleaner opposed to soaking. Before removing the plate, note the side facing out as this side must be facing out when you re install it. If you do remove the plate, the shaft on our Keihin carburetor could be pulled out by removing a C clip on the top of the shaft and then carefully removing the felt seal with a slotted screwdriver. While removing the shaft, note where all the springs and linkages go.

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