You are right offroader, it's only talk. The thing is I have made cylinders but only for my own consumption. I will go ahead with a cylinder for the YZ ( as a test ), if they are any good I will make them available. A set of YZ 250 cases turned up today to measure up ( I'm not pulling mine to bits yet ). Seems there will need to be a slight crankcase change to get an 80mm piston in. I'll look at some smaller piston options also, although I like the 80mm piston.