on the stock ignition we tested, it showed at low rpm's it fired one cylender at a time on both sides, like its supose to. as the rpm's increased it would put the spark to one side only. a little higher in the rpm and it would go back to normal. and then again to one side at max rmp. after seeing that i dont think i would ever want a stock setup again. but we only tested one setup, could have only been that system that did it.