The bike ran fine, then made a clank noise and died, my cam chain and sprocket had came off, My old cam was toast, so I bought a replacement, installed it, put the head back on, now it won’t fire, not even a spudder with starting fluid, it has blue spark, just won’t kick over? Could my timing be off? Valves? The piston seems to be in good shape same for rings. I adjusted the valves, I’m still learning as I go. Any advice appreciated.