is this a GY motor? push rod
the engine timing is done in the lower section. No need to time if you have not disturbed the crank/cam.
The ignition timming is static. so you cant change this. The pick up from the fly wheel is in the flywheel cover.
is it this type of engine?
a GY or CG clone?
the engine code on these are stamped just in front of the gear changer behind the front sprocket cover.
on re-assemble, make sure you do the rocker gaps (3 thou) both valves. Also remember is TDC to adjust these. Very clever design.. they use 1 lobe for both valves. any way.. If both valves are compressed at TDC then its on its power stroke, turn another 360deg and you should be both valves closed. This is where you adjust the gaps.
good luck