I have a set of dune ported cylinders (65.00mm) that have been touched up by passion with pistons rings and domes they are ported for a 4mm crank. I also have a +4mm stroker crank with 115 mm rods that is trued and welded and a set of 64.5 mm cylinders that have a clean up port. i am looking to trade for a good 68mm cub cylinder with pistons rings and domes. thanks