From:Mark Hill
Subject:RE: ANOTHER RARE RACING HENDERSON Date:Fri Feb 21 09:11:27 2014
Response to:5004
Hi Barry,
If I were a betting man, I would guess that bike is a 1916. It is definitely a single speed Henderson. Judging by the flutes on the oil pan and the side mounted spark plugs, the bike is '16. There are actually 2 1916 oil pans, and this is the earlier version, from what I have seen. In the later engines, the middle flute that is exposed, goes away. The bike also has interesting intake and exhaust manifolds. All Hendersons from 1912 to 1919 have a 3" stroke. In 1916, Henderson changed the bore from 2.625 to 2.50. This dropped the displacement of the engine to 58 cu in to conform to F.I.M. standards to get below the 61 cu in displacement so that the bikes would be eligible for competition. Great shot of a single speed factory racer. Do you have any other information on this bike? I am building a 16 for myself and I may go the racer route. I know Roy Artley was very successful with a 16 Henderson. I think the 16 is probably the best kept secret of all of the Detroit style engines. You get the big top end and big valves without the weight of the 3 speed transmission and heavy fly wheel that was used from 17-19.

Noticed this in one of Ivan Stretten's great books.