Kevin
Spec #30500 should have an alternator stator, and an external coil, and 30565 would have a stator magneto-assembly located under the flywheel. Would appear it might be something that someone adapted to fit a need, or maybe some sheet metal parts have been switched from other engines. Neither of these spec numbers came with a recoil starter attached.
Wyatt
The spec # on 409 is EX28542E. On 12/22/03, I received an email from Mr. Hank Baumann, Kohler Customer/Tech Service, stating that in the 1960 time frame, the "The "EX" designation denoted our test/prototype engines in that period of time". The 28542E is the spec number of the production electric engines.
It is interesting to note that the engine on Mr. Schramm's #411 is a K161T, spec # 28498F, S/N 466285, a recoil start engine with an electric starter. Mr. Schramm said that when the tractor was built, they "basically just went to Kohler and got an engine off the shelf". The spec number changed when IH came up with the engine requirements for the production tractor. The engine S/N of 411 is 466285, which puts it in line with 409's 472733, 510's 478549, and 556's 478704.
411 was built by the Engineering center in early to mid 1960, prior to the 10 prototypes built in Louisville. When the tractor was released for sale, the "Q" number(QFE) plate was removed, and the number 411 was stamped into the gear reduction housing. IH had used the 400 numbers in the past on prototypes, and the numbers 401-410 had been used on the Louisville proto's is the reason for 411. Mr. Schram has documentation stating this, from Mr. Dave Stevenson,who was the Cub Cadet Project Manager (I believe that was the title) and is also one of the addressee's on some of the Tractor Committee Reports dealing with Cub Cadets. Mr. Stevenson states he bought the tractor when it was released for sale, and personally watched the "Q" tag come off, and the #411 stamped into the housing. He also states the "Q" number was lower than the the "Q" number of tractors 401-410 built in Louisville, but does not state what it was. There are several minor, or suttle, difference's between 409 and 411 - the top of the grill casting, the thickness of the front axle, the top of the dash at the hood contact area - but you almost need them together to see them, and that is suppose to happen at RPRU. The casting date on the transaxle housing is 1-5-F (Jan 5, 1960).