tire question

[X-RACER]

what size flat track tire would you guys suggest
for my 200X (if I ever get the damn kick start problem fiixed)
I want the smallest for the most low end punch
but with the widest profile for better grip
I had them on my race bike back in the day(250R)
but cannot remember sizes to save my life...

..seems like 18X10.5X8 was what I ran,but who knows...
1985,86 was a long time ago...LOL
:confused: :cry: :)