Here is a 42 motor that got dropped off at the shop for the next batch of motor rebuilding. The owner was riding the bike home and heard a strange noise, he thought he dropped a valve and decided to try driving the remaining three miles home. Check out the 41 to 44 fl cylinder. these things are soooo rare and hard to find. the date code was put on the cylinder wall, and most of it was machined off when hd cut the relief for the cylinder base nut.
This is the first time that I have seen a motor brought in with a tie down strap holding the cylinder in place.