I'll tell u what I'll trade u , and that box does a whole lot more with a laptop and a curve maker. Can you plug another cdi in from another bike, like I said I doubt your cdi is dropping one cylinder, banshee have a total loss spark system both fire at same time , did u ever try swapping your carbs I see u have 28 pwks, too mee it's sounds like a clogged circuit pm me I'll give you my number I've seen a few other issues with 28s we can go through