Riding my blaster the other day was running excellent, then after I came out if a turn I tried to acclerate and my motor felt like it was extremely sluggish and slow, barely accelerating at all so I putted about 100yards back to the house. It would not kick start after that. I noticed my idle screw fell out ( tors delete) and I had a wide open hole. I happened to have an extra from another carb so I put that in and changed the plug, which was completely black. Kick started and rode fine after that for about 20 more minutes and then got the same symptoms. Replaced the plug again ( black again) but this time had no change. I can push start it w another quad to get it to run, but it doesn't even have enough power to pop a wheelie.it has plenty of gas and oil and nothing else looks irregular or out Of the norm. It's got about 5 hours since the rebuild, and ran great after I jetted it just after the rebuild. Anyone have any ideas on where to start?