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Soft mounts are tricky. They have to be tight enough to hold pressure on the rubber O-rings & seal, but loose enough to allow the engine vibrations to be absorbed. Hence the Thackery washers. The 20mm odd thick rubber ones are great, but the little thin one-piece O-ring types just fall apart after a year or two. If you don't have any there's a chance of the fuel in the bowl becoming a foam at certain revs, but that may never happen.