This is an Airsal Morini cylinder kit that has been converted to fit on a Batavus. It has split transfers and plenty of room for porting. The Batavus engine case will have to be bored out 1mm for the cylinder skirt to fit, otherwise it bolts right on. We highly suggest you use a matching morini head to get the best cooling. We can make an exhaust to match up to this cylinder just e-mail us. Does not include a head gasket.