I'm pretty sure on this.... Hopefully Lew can back this up.... A 141 is an early 161. I don't know if they ever built them at the same time.
I do know this for sure:
There was a bore change during the life of the 7hp motor. They went to a larger bore. Everything else stayed the same. The old motor can be bored out to the new bore size with no problems. And it's a lot different, so no matter how bad the block is it should clean up. The pistons/rings and cylinder parts aren't available for the 141 anymore anyway, so a rebore is all you can do.
Fenders look homemade/modified. Is it an electric start?
Congrats on the very.... VERY early "O"!!
