I took off gas cap and gas did not smell good so I decided to pump out old and put in some new. Now It seems to be not so loud but is backfiring when i give it gas, i ran it for 10 to 15 minutes to see if it would clear up but sytill had no power and is now backfiring, Could this be something in carb?, Is there a additive that might clean the fuel system? I use stabil in most of my gas but i ride the atv very infrequent, was sick in Feb and did not get to go out on ice with it, so gas may well be pretty old. I thought I saw an add for smething amsoil sells that makes engines run cleaner,,, If not I will have to take it to a shop...
Thanks