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Message: <blockquote data-quote="dkl" data-source="post: 173124" data-attributes="member: 2308">I said before, I worry about the How not the Why.....but u asked, so here is my thinking on the single runner manifold and the rules of carburetion. The GL1100 has a 1085 cc engine, I was taught it needs about 1/3 of the cc engine size for Plenum,,my math show it needs 342 cc of plenum volume, but that is if all cylinders pulled at the same time---since only two pull at the same time it needs 170cc volume.The runner itself serves as the Plenum, the single runner is 1" diameter and 11" long, the volume of the runner is 140 cc, and that does not factor in the tees and fittings going into the rubber boots,,,,,My math and reasoning are probably wrong......but that is why I think it works...</blockquote>