KX Guru Racing

"Noo,I meant is it a pro circuit barrel "

That's what I was commenting on. I have no idea if someone worked on it... all I can tell you is that it is either a 86 or 87 KX500 cylinder or barrel..
As far as I know nobody made any after market cylinders.
Kawasaki made some SR500 cylinders but yours is not one of them

Sorry.....we got there tho,so no after market pots were produced,and here's me been told that pot is worth £1500,phone call to made now,Cheers again