I have a 06 Brute Force 650 and I am having a backfiring issue. I have already done a carburetor rebuild with stalk jets front and rear. I have also cleaned and serviced the fuel system to include cleaning the inside of the fuel tank. I just replaced the spark plugs last night and still have the same issue. The bike fires up and idles just fine but as soon as to start giving it some fuel it will stutter and backfire through the carburetors. if you feather the throttle and get past the backfiring the quad is a beast and it topped out at 56Mph I am at a total loss and extremely frustrated. If anyone has any ideas or suggestions I am open to anything at this point before I take it in for service and it be a super simple fix that I pay a local service senter hundreds of dollars for.