I got my first trials bike, a 2000 beta Rev 3 270. Bike ran good when I got it. Typical older bike so I pulled some stuff apart to sort it out. While at it I pulled the carb and cleaned it. I set the float to what I read online with the tangs pointing at the piolt jet tower (the tangs were level when I opened it up) new plug etc. I get it all back together and it starts ok ride down the driveway, bike is running a little irratic with a high idle. Turn it off adjust the idle screw, start it back up and it begins reving uncontrollably. The kill switch will not even turn it off. Finally it turns off. Now when I try and start it all I get is an occasional back fire through the exhaust. I pulled the carb again and blew it out and cleaned the pilot. Still no change Tried raising the float level and again nothing. Plug is wet with fuel and getting spark. Any ideas?