I need help with my 300ex, it starts up nice but idles a little low and I can take off nice but after about 15-20 min of good riding the exhaust gets really hot and once I slow down to a complete stop it revs up but not super bad I’ve fixed it a little but anyways it revs up and then if I give it some gas then it’ll go down in about 30 seconds but then it idles so low that it dies unless I give it gas, I was going to order parts but I wanted to ask some of you first, should I order a exhaust? Different carb jet? Different air filter? Please help