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this actually got better until today again, i cant understand whats going on. Runs fine until you open the throttle wide open then its nuttin but a stutter , no power, as if its running on one cylinder. Any suggestions thanks

Hi guys new to the site and need some help, gota 04 switchback 600, few mods, slp silencer, slp intake, EPI clutch kit, vforce 3 reeds, jets dropped from 420 to 410, changed the timing the other day and put in one that is 2.5 degrees more , then a couple days later i started the sled let it idle...