How do you calculate the gear ratio on a Honda?

[GN Racer]

I wish I had some to sell! Aside from the 8.44 set, all of the stuff there is "take off" stuff. I just kept the packaging to put the stock ones in....

If I knew that the Malossi gears woud be so hard to get nowadays, I would have stocked up, along with some, Arrow pipes, DIO engines, all of the Kitaco/Daytona, JDM stuff, etc...