Okay, I will but I have examined the illustrated parts thoroughly. I also don't know what part is missing. I just know that something used to be attached to the shiny silver part.
#4
ILENGINE
Where the silver lever is looks about right for the throttle stop bolt and nut. Used to set the top speed position.
Start with mower serial number makes thigs easier to check against parts diagrams.
Most Arins parts breakdowns are available from their web site
Rotating the photos then reposting them would make things easier.
Looking at the first figure (5-37) it appears the machine is missing the choke cable from choke control lever 1 and the throttle control cable from throttle control lever 2. Additionally a couple of levers look screwed up and it appears you're missing both the kill switch and kill switch adjustment screw.