It should match your spark plugs as Irk already mentioned. They are either 1/2" or 34" and the plug diameter is either 10, 12 or 14mm. Measure them.
I don't mean to sound mean, but you have all the input you need. It's time to stop and think about it and learn from your own inspection of the parts. You call yourself KickRacing Motorcycles as if you build racing motorcycles and it's good to be aspirational, but a healthy dose of reality and initiative help. People love to help those who help themselves, but aren't really interested in helping people who seem to be playing some sort of cosplay with motorcycle builds and who want others to do all the thinking for them.
It's the modern equivalent of catch a fish and feed a man for a day. Teach him how to fish and he can feed himself. Same idea - less fishing.
I'm really not being mean. I just want you to stop and think about what information you have in front of you already. Do some research on line about spark plugs. Check the NGK site for example and some of the missing pieces will start to drop into place.