I have not heard this run. and it has been in storage for a long time. I did a compression test and took photos of both cylinders. the donor motor was a 1954 johnson cd-10 serial number 1089669. this thing is far from perfect, its dirty and has the old rusty plugs in it (only rusty outside) it also has 2 broken and rusted screws that will need removed, they are for the cowling mounts.