These pics show a 1924 N which has an aluminum tank and the sn tag is on the reverse housing. The carb should have an air shutter on its entrance. The tiller arm should have a short rubber grip on it. There were 4 carbs used on the N: A Zenith in ’23-’24 like in the illustration I recently posted, a different carb in ’25 like the carb with the big elbow on your motor, a different carb in ’26 that had a throttle lever cast onto a disc on the starboard side, and a typical Tillotson style in ’27-’28.
Your motor might have a later ’25-’28 muffler but I’m not sure. I think the ’24 N had the same muffler as the ’23 which was a tin can style like Model A Johnsons.
There are a lot of unknowns with the Model N differences between ’23-’28.
There were 6 different reverse housings.
