2003 yz250f

Ok so my friends 2003 yz250f still doesn't run checked valves checked timing, it's Gettn fuel and spark, replaced fuel screw bug my question is when I pulled flywheel cover off and set the fly to the TDC mark the piston was about half way up which means someone removed the flywheel. Would them putti g it on wrong have anything to do with it not starting... In 1st gear trying to bump start the tire locks but in 4 and 5th it trys to start but doesn't run... I'm lost

someone didnt tighten it enough and it has sheared the flywheel key.

hopefully you didnt attempt to line up the valve timing with it like this

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