I´ve had the bike sinsc Christmas ans never had a problem. The bike usually starts on 1 or 2 kicks. My 4yo son rode the bike for about 20min last week and parked it. When I tried to re-start it, NOTHING! I checked and repalced the spark plug, checked the fuel. The kick lever seems to work fine except it feels like there is less compression. I took the head off. The top of the piston looks fine. It looks like it moves up and down normally when I actuate the kick lever. I put it back together and...Nothing. It´s not even trying to start. And it still feels like there is low compression. The kick lever moves very easily. Prior to the problem everything was normal, no odd noises, no smoke. Please help. Eddie