This is a used cylinder barrel for a 50cc Honda PF50 4-stroke OHV moped engine . It should be the same as used on the PC50 / NOVIO / GRADUATE models that used the same OHV pushrod type engine ? . The bore size is 42mm (which is the standard size) but it will need a rebore to the first over-size just to freshen it up due to rust marks and pitting etc. There are no heavily corroded away or broken cooling fins. I have a few more parts for sale from this engine which i will be listing soon so keep watching !. Please enlarge the photos and have a good look at the item and condition for yourselves as they form part of my description. Any Q,s please ask.