So, back in my the key to my fourwheeler was lost. Didn’t have the money to replace it right away, so it sat in the weather for about 3 months. When the ignition switch was switched for the new key, we started it up and it automatically start blowing out white smoke. We let it run for about 30 mins and it started to back fire and still blew out white smoke. We drained all the fuel out of it to make sure that if there was water in the gas we would get it out. We washed the air filter, and now, when we try to start it has trouble starting won’t stay running, doesn’t want to accelerate and when in high gear the four wheeler doesn’t want to go at all. If you’re not hold the gas down then it dies. It still back fire, blows a little bit of smoke, and doesn’t run right at all. There’s also a knocking under the seat. The actual screen on the fourwheeler for mph and rpm etc... was already broken. Does anyone know what could be going on?