Blown motor and Moves in gear

[Daddy_Blasty]

I was recently riding my 03 blaster down the road i hit 5th then all of a sudden i heard a bang and my engine cut out and i just rolled to a stop i took the jug off and first thing to notice was the spark plug covered on metal a closer look at the piston revels it over heated and just blew a chunk out of the top of the piston clearly indicated it was getting no oil the lines seemed bone dry i still have the oil injection

my real question is what more could this of done for some reason when i put it imto gear i can roll it back and forth like its in nuetral there is only minor drag im confused i just changed my crank case oil like a couple weeks ago what could of happened HELP

 

[Markblaster]

I would do injector delete and go premix. Your jetting may have been wrong also.

Here is a video of the worst that could happen. The crank could also be toast. How is you crank?

Oh and the crank case has no oil apart from fuel / 2 stroke oil mix in it. You replaced the transmission oil for the gears and clutch.