04 switchback 600 running on 1 cylinder sometimes 2

powderfeen

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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 for bout 20 mins while shovelling the driveway, went to go for a ride and immediatly noticed she was running on one cylinder, tried reving it out, then she seemed to be kicking in from on cylinder to 2, while idling u can notice the idle drop and then hear some kind of click then back to normal idle. kept going for a ride to try and work it out but she still kept going back and forth from both cylinders to one. threw a new set of plugs in and same thing, the day after we checked the spark and everything seemed good there. while the sled was running i pulled the mag side wire and it still ran, but if i pull the pto side it will shut off.. been doing a lot of research on this and seems it could be carb issue. didnt do a carb clean on it this year because of a short season last year but maybe i should have lol also i have a koso temp gauge hooked into the y pipe so i get an accurate reading of my temps and nothing seems abnormal there. gona do a compression test tomorrow and im gona do a thorough breakdown and cleaning of the carbs too, but incase this dont work anyone have this trouble before and any ideas on what is going on here,thanks greatly appreciated
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powderfeen

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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
 
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