i bought a 1993 f2 for $500 with only 16k on it and it had a stripped spark plug hole.. i took off the head and had it fixed and installed then when i was installing the cams/camchain sprockets i somehow screwed up the timing with the in/ex marks on the head surface with the t mark to the dot on the cover.... when i went to fix this i went to turn the crank and it wouldnt turn... what could be causing this? i would appreciate some help asap!! thanks

 

I would take the cams off and see if the crank turns. Then I would time the cams. The Haynes manual describes the procedure.

 

sounds like you have piston to valve contact, be very careful you could bend a valve if you try to force the crank.