Lately when I go to start the bike, (for the first time in the day), I am getting a backfire after those few initial kicks. After my second or third kick it will start an run great, like a raped ape. After it is hot it always starts on the first kick with no back fire. I am running at about 5500ft with the 48 pilot and 62main combo, the bike is perfect otherwise and has about 60hrs on it. Any thoughts?