Re-sync them. If i read this thread correctly, you were trying to sync them with the slides in backwards, this could be your issue. Also, do you have a sync tool or are are you doing it by eye? I ask because i thought i had mine and my bros banshee perfect by eye, then i bough a sync tool and found out they were actually pretty off lol. Since everything is clean now and you have new jets/gas in the bike and good compression etc. I think you may just need a sync. You may have fouled the plugs as well. So, new plugs and a re-sync is what i would do but thats just me. Hope this helps