you can only run a cdi off a predator 500 03-04. I would check to make sure you dont have a bad key switch or a kill switch grounding out and not giving you spark before going to the cdi. there is also a black sealed bag back by the rear shock that has a self resting breaker that when get dirty or wet over time go bad. You have to cut that bag open to check it tho.
04 Polaris predator 558 Flat track quad
04 Polaris predator 500 trail build(in the works)
started life as a replacement frame so a ground up build
Build predator and outlaw lowering kits