Tapping spark plug holes

I am almost ready to fire up my Z1R project, I have one of the spark plug holes that I would like to clean up. Does anyone know the proper tap that will match the B8ES plugs? It looks to be maybe a 20 tpi tap.

This may help.
kzrider.com/component/option,com_joomlab...w/id,179868/catid,2/

It's a metric thread, 14mm x 1.25 I believe.

I was lucky enough to have mine machined for 15$ at the local machine shop!!!

I found the perfect answer to my situation. The tool is called a back-tap, it will clean the threads from the bottom up. The only problem is that here in Canada we have Canadian Tire as the distributor for "Powerbuilt" tools. I tried to order a tool today at Crappy Tire and of course they could not help.......
As soon as the manufacturer told me Canadian Tire, I had that lost hope feeling:huh:

Hi Night_Train01, you dont give your location in Canada but if you happen to live in a city or town where there is a Princess Auto I would recommend that you check them out. I'm sure I have seen on their shelves tools for chasing a spark plug hole.

JR, thanks for the information. There is a Princess Auto close by, I will take a look this week.

kinda confused doesnt he already have his local in his sig?

I just altered my sig after reading JR's post

I took a quick look at the speciality tool section of their online catalog and found a spark plug hole chaser for $6 and a hole rethread kit for $10. I love that store. Good luck with your project.