The time to take pics is before disassembly.
Some parts are missing.
Depends on engine model and type number.
definitely. always take the pics before disassembly!!
I've been there lol. but luckily i had an identical engine to use as a reference.
anyway, it does seem to be missing quite a few parts from this pic... maybe get a few pics of the carb and where all the linkages go (wind vain if used on this model, all that good stuff)
take the air filter off too (just to make things easier to see). getting the dirt and stuff off everything would help a lot too. get ALL the parts (linkage rods, springs, w/e) and take a pic. we can
try to help.. but if you are missing any parts, it makes things a lot harder to figure out lol