Large Pop...Is it the end

[WJTED1]

Hello,

Driving on the highway Saturday I heard a loud Pop from the left side of the engine then a very loud noise like there was no exhaust on the bike. I think I dropped a valve or worse. When I turn the key on the headlight works but none of the lights on the "dash" light up. I am guessing I have to take the engine completely out and see if it was the valve or piston. Would you recommend cyclepedia as a reference for something this detailed? Thank you!