You will need to take the tension off the timing chain to put the top end back together. Here is a picture in which I have circled the timing chain tensioner. You can just remove the tensioner completely, or back it off with a tiny phillips head screwdriver. The adjustment is in the center of the cap on the outside of the motor that I circled. Take the cover off and stick the tiny screwdriver in the hole.
__________________ Yours truly, sincerelly, love always, Josh aka The DirtDemon.