size of vacuum plug?

83 kz750L3 missing one plug I just don't know what size to order? 4,5,6mm 1/4, 5/32????// Thanks in advance.

Take a look at the link below. When you get to it click on "Select Assembly" and use that to find the parts diagram for the part in question. That will then enable you to identify exactly which part you need and what the Kawasaki part number is. Using that information will make finding the correct part much easier. Ed

www.powersportswarehouse.com/p/Kawasaki#/s/KUS/kz750-l3//1/

The vacuum ports are typically 1/4". The vac plugs for the 750-L3 are listed at Partzilla as 12x25, which probably means 12mm OD & 25mm L & the ID is probably around 6mm.

Thank you lads.