Those pumps do work on pulse vacuum. A single cylinder engine would not produce a steady vacuum signal, maybe would look steady at higher RPM on some gauges. Anyway, I'm sure you checked and compared the vacuum line routing with the other machine but I think you might have the vacuum lines on the wrong ports at the carb.
If donor pump works on donor bike but does not work on other bike then compare vacuum on both, double check lines for obstruction and routing. By design these need a fuel pump due to low mounted fuel tank and fuel has to travel uphill. If you decide you need a fuel pump there are cheap options, many small engines use this type of pump and they are all very similar. An example of a pump that would fit is used on Honda GX series engines, they are cheap on amazon/ebay etc
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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