Here is a nice original cylinder for a 1hp Fairbanks Morse Jack Jr Hit & Miss Gas Engine. I have not used a bore gauge to measure the cylinder but when it was on the engine it had good compression. There are a few holes that have been drilled in it but they would be very easy to plug. Take a look at the pictures and see if you should have it. For questions 419 789 1159. The bore is 3-1/4 in diameter. No cracks, breaks, or welds that I can see or know of. The valves feel good in their guides. There are some holes going into the water jacket that would be easy to plug. Heavy, it is 54 lbs before any packing or box. Thanks for looking at this listing! If you want to check out my reputation and such please feel free to google search my name. My name and address is. 14316 State Route 281. If you can find a way to talk to me with your voice you will almost always get a quick response. If you message me please try not to sound like a caveman. I have terrible grammar myself so I understand but sometimes it is very difficult to comprehend what some people write. If I make a mistake on my measurements or you feel something is not as described please let me know and I will try to make it right. I think most all of my customers with a normal level of sanity are happy. I think most people would agree that I do an extremely good job of packing items so I guess it’s worth the wait. Check out my other items. Be sure to add me to your favorites list.