The reference to 1 speed or two speed only refers to the rotation of the flywheel. Those marked for one speeds simply fire (and properly advance) for a conterclockwise flywheel rotation. I recently found simply flipping the coil around will basically flip the curve, essentially making either box work for either flywheel rotation. The 1 speed stuff would work maybe a tiny bit easier just since you won't have to flip the ignition coil, but thats it. As always, check and verify the bike is properly sparking with a timing light and impact wrench or something that can spin up the flywheel.