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It’s interesting this subject came up because I just dealt with this same problem yesterday on a 1960 Lightwin. When adjusting the throttle cam for link and sync. the throttle was way behind the ignition advancement and there was no adjustment left in the slotted cam connection.
Looking closely at the cam in cross section and the upper 90 degree bend was clearly larger than 90 degrees meaning it was bent backward toward the powerhead. The link and sync adjustment was off about an inch from the factory mark.
By using a large screwdriver as a lever, I was able to carefully bend the bronze throttle cam forward little by little until the adjustment was right on the mark. This is an important adjustment that often gets overlooked.
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