Evilsideracing

hi. Im having the following problem. My Shee used to start like a champ but ever since ive put fmf Fatty pipes on it, its almost impossible to start it. The funny thing is: After about an hour worth of trying to start it, i get tired of it. Then my buddy tries it and the damn thing starts up first kick. Does anyone have an idea of what im doing wrong?????? I love to ride the Shee but it pisses me off every time i have to try to start it for an hour before riding it. Please help me!!!!!!!!!!!!!!!