This is different for different models of Hondas, depending on the size of the forks and the size of the fork springs, the kind of terrain and riding style the bike is designed for is also taken into account. The information can be found in the owner's manual for the bike. If you don't have the manual then there is a rule of thumb that can be used. Fill the forks up but leave 110 mm from the top. If you use more than this, then the suspension will be stiffer. If less is used, then the suspension will be softer and perhaps too soft. Many riders use 10 W oil.
Honda has a tendency, just like most motorcycle manufacturers, to place the VIN in the area of the front forks, around where the forks "connect" to the body of the motorcycle.
It is absolutely critical for the safe operation of the machine that the year and model be referenced for a correct answer
it should be on the front of the frame right behind the front number plate
This should be 5-6 PSI. Try 5 PSI first.
A normal motorcycle has springs built into the front suspension. You may not see them because they are inside the forks/shocks.
135cc for 30mm forks
12.8oz
12 to 17 psi according to how stiff or soft you want them to be.
You have to drop one of the forks.
No, they are totally different
Use automatic transmission fluid (ATF)
it will explode