2006 450yzf, Changed oil and filter (engine was run for about five min. after oil change), a good cleaning and put to bed for about six weeks Started bike up to get ready to go riding, it run for about 30 seconds got tight and quit. Checked oil (it was ok) started again and got tight and quit again, kick starter was hard to move. Let it set for about five min. and it turns over normal. Drained oil checked filters all are good. I am thinking maybe cam bearings?? Any ideas..