Hello. I just purchased a used 09 scooter bike with under 1000 km. the bike has a 70 cc kit. It has a pod air filter. My question is what could or should I add. A high performance pipe or bigger carburator. The bike doesn´t idle very well. A bigger main jet was added but the idle screw is all the way in. I am going to clean the carb to see if that clears it up. Thanks