Bought a 2008 Rancher 420 4×4 the other day no compression.

Replace jug, gaskets and rings. Got it back together and attempted to adjust the valves. I line up the T on the flywheel no matter which stroke I have it on one of the the valves has the spring compressed and it is impossible to adjust?

Its like it is out of time?

Rebuilt a several 250 and 350 topends but never had this issue.

Any and all help would be greatly appreciated. Want to hit the trails bad.