Ship us your Franco Morini case halves, and we will professionally bore the sleeve to 50mm so that it will accept the larger post 1985 cylinders. This is much easier than hacking at it with a dremel. Boring out the sleeve area is the most labor intensive, and easily botched process when mounting up the a bigger cylinder. Please be sure to completely break down your motor, and clean it.
After purchasing this service, please place your 2 case halves in a box, and ship it to: 1977 Mopeds213 E. Frank St. Kalamazoo, Mi 49007
