Matt S
The starter generators were painted yellow because they were supplied installed on the engine, by Kohler, and were painted yellow by IH when the engine was painted. When IH "discovered" they could buy the S/G from Delco cheaper than paying Kohler to buy them (about the wide frame model era), the S/G color was black as received from Delco, and was installed on the IH painted, yellow engine.
Andrew Coffee
The 70, 71, 72, 73 all originally came with a K-161 7 hp engine.
Art
I am interested in how that steering arm mod holds up over time. In the past it has always been frowned upon to use a bolt in the arm rather than the coiled spring pin, because the bolt caused increased wear to the hole in the spindle - something to do with the lack of tension that was present when the spirol pin was used, that one of the engineers on here will have to explain.