First, thanks for the info on the auto-choke issue. After getting over Honda design being the fault of my no start issue, I purchased a thermowax plunger and is looking forward to repairing the auto-choke. The two 10mm bolts are torque value 10nm, and suggest you purchase all the gaskets to start fresh. Download a Honda schematic to put the parts in order and start with putting the bolts on the air cleaner first.
Appreciate your info here...
If you are going to own this mower for a while, time to make some special tools.
Take your carburettor mounting bolts to a specalist nut & bolt shop and buy a pair that are about 1/2" to 1" shorter.
Now go home and cut the heads off then cut a screwdriver slot where the head used to be.
Screw these 2 "assembly guides" into the engine block , then slide all of the parts over them.
Being shorter than the original bolts you have enough space to engage the "Z" bend easily.
When everything is in position replace your "special tools" with the Honda bolts 1 at a time.
Put them in a sandwich bag with a name strip on it, name them and forget where you stored them safely for future use.
If your engine has studs then do the same thing after removing the studs except that you will need to tighten them back up before the air filter goes on as there will not be enough room to double nut to tighten the stud with the air cleaner on.
GEtting all those gaskets & heat shields in place is the only PIA job but this makes it a lot easier