Ryan W
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I always thought the 60's/early 70's cubs intended for an "electric start" (S code) meant that it was to get a Starter/Generator pulley, rather than a "recoil starter" setup.<!-/quote-!><hr size=0></blockquote>
The "S" means electric start, and before the AQS engines came about with the Quietline models, the only electric start available was the starter generator. The only engines with recoil start that IH used in the Cub Cadets was the 7 hp K161T with a retractable (recoil) starter. The K161S had electric start. The recoil starter was standard equipment on the 7 hp K161 used in the Cub Cadets, and electric start was an option, except for the model 73 which was the only 7 hp model that had electric start as standard equipment. The Original had the recoil starter mounted on the back of the blower housing, but the 70, 71, 72 had it mounted on a plate, called a coffin plate because of its shape, that was mounted on the front (PTO end) of the engine. The recoil unit was at the top of the plate with a belt down to the same starter generator pulley mounted on the crankshaft that was used on the electric start tractors. The recoil start 70, 71, 72 used the the K161T engine.
So, the "S" stands for electric start. It does not mean the engine got a starter generator pulley rather than a recoil starter.