2002 YZ426F checked the valves last month, with nothing but an oil change since then. so after a long winter break i took the mighty YZ out to the local track. Warmed it up like normal, headed out for the first session....nothing abnormal. 2 jumps into the first lap, high pitched squealing noise and the bike cuts out. Kind like it is seized. Even if i pull the decomp lever in i can't kick it over. So after a long push back to the pits. I can kick it over with a bit of effort, I decide to give it a go. The bike fires, but with a loud and I mean loud clicking/ticking noise? Couple guys at the track said I sounds like i caught a ring and that is the noise I'm hearing. What else can I do to diagnose this, or should i just bite the bullet and tear into the engine?