its a pre-1920 motor, as evidenced by the enbloc cylinder/crankcase casting.
Cylinders would be removable if it was a 1920 or later Kobunn
Hope this helps.
Best,
PM T2
He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...