seized bike

well to make a long story short, I recently lost most of my oil through a missing valve cover bolt and discovered that the cam journals were basically toast. I replaced the head on my 06 rmz 450 with a 07 head from ebay. Bike ran for 5 hours after rebuild until seizing after landing from jump. (motor abruptly stopped and kick starter would not move,) I figured the crank bearings went from the running it on low oil before rebuild. took of cylinder and head and noticed no visible damage and my crank moves! I'm stumped, any ideas?:busted:

Someplace, there is going to be damage of some sort. An engine cannot stop abruptly without some telltale sign. Perhaps a chunk of metal (like a gear tooth) may be wallowing about. Sounds like you need to dig deeper.

And by dig deeper, looks like you'll be splitting the cases. :busted:

its just weird to me that when i got the head off the crank/kickstarter were able to move. This makes me think its not in the cases but perhaps in the cams. I'm thinking about just putting it all back together and seeing what happens.

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