When i tried starting my 400ex it spun and felt like there was no compression. I thought it was the head and valves, so i took it apart. Turns out there fine, but i soon found out the problem was the timing chain. I was off and thats why it would not start. Now that I put the motor back together, the timing is worse than ever and it still will not start. How do i properly set the timing chain, to get things back in order??????