Hello, everyone. This is my first time on this forum as I am usually on commercial lawn care. I am attempting a repair and am in need of advice. My little nephews 4 wheeler has a crack on one side of the motor housing or casing. Im not sure what the metal type is called but its pretty much used standard on any motor blocks I think. Its not a huge crack, probably closer to a hairline crack, but a tad bigger. Needless to say it will not hold oil right now. I have it off the floor and the oil drained so that the crack can be cleaned of oil before attempting a repair. How do I go about this. I do not weld, but have 2 friends that are fairly decent at it. But they say that I have to have a special type of welding machine to do it. Other mechanics have suggested sanding the area to rough it up and use some 2 ton epoxy. Still other mechanics have said the dreaded JB WELD stuff. HELP I really appreciate any advice you all can give me. Thanks.