Choose the jets size from the sales drop down list. Only ever use genuine Mikuni parts when attempting to correctly tune out rich or lean engine conditions.
The Mikuni N100.604 main jet has a total length of 9mm with a 8m head diameter head and 5mm outside diameter of the thread. This jet is also identifiable against the VM11/22 by the machined groove around the 8mm diameter head. Be careful not to confuse this jet with other round head main jets.
(The background lines are at 1 & 10 mm spacings)