Okay, so lately, my bike has been becoming harder so start. So I figured I change my spark plug, since I hadn't done that in a while. I changed it out, and still, nothing. So I'm kicking it over, and it won't fire. I pumped the gas twice like I always do, nothing. So I decided to give it gas while I was kicking it, maybe about 1/4 throttle, and it fires up. I was happy that it started, but was puzzled by what I had to do to start it. So I bought a new air filter, thinking that it was starving for air, but I still had to give it gas while I was kicking it. I don't get it, I'm thinking it is the valves, since it is an 04', but I'm not sure. Can somebody help me out with this?