well, it sounds to me it may have jumped time ?. soooooo, down load the service manual first, do a compression test ( to make sure it has enough compression ? ), you say it has spark ?, soo..odd's are, no compression ?, or jumped time ? ( cam chain solves this ). please read the stickie on how to set and adjust valves in the repair section, this points you, leads you to how to check the timing .