81mm and 81.5mm bore, you can run OEM bore gasket.
You can even get away with the OEM gasket with 82mm bore.
Anything bigger than 1mm over the Gasket bore, you have to get custom or Cometic.
95% of the Gaskets we use are for 81-82mm and 84-84.5mm Bores. We do custom bores on
bores that are in between and bigger than 85mm. HONDA OEM Gaskets only all the time of course.