12.7 60 series no start

[Btech]

Definitely sounds like a timing issue to me from my experience with them. Time to get a dial indicator out and check cam timing that way. Its the only way to be sure timing is correct, I had one that with all the timing marks lined up on the gears timing was wrong, moved the cam gear one tooth over and it measured out perfect and ran like a top.

Also, just because the cam gear stayed in time doesn't mean it couldn't have jumped on the crank and had valves make contact and mess some up enough to cause issues.