02 foreman 450 new carb good spark no sign of starting

I got an 02 foreman 450 givin to me in terrible shape, i put a new carb and plug and hoped to atleast get it popped off, no luck at all. I checked the timing and its spot on, chain is pretty loose. So i decided to tear down the cylinder and look at the piston, the rings were stuck in the grooves and the cyl had minor surface rust. Could the rings being that bad cause the bike not to start. Im ordering new piston and gasket kit and hoping that will help it, should i change the tensioner and chAin while in it