I'm pretty sure the crank is not the same between a K241 and a K301. If the engine does not have the "A" meaning 'special oil pan', it will NOT fit in a NF Cub Cadet. The 10 and 12 hp oil pans aren't technically interchangeable, either.
I'm going to reiterate this...get an engine that was originally from a Cub Cadet so you can avoid all this guesswork and 'will this random K-series engine fit my 100?' BS...
You won't be able to rebuild the second engine while you use the original engine if you need half the parts from the first engine. Keep in mind that there are HUNDREDS of variations of the K-series engine. Many different throttle/choke configurations, crankshaft configurations, etc. Somewhere I have a pdf file that lists all of the different K-series crankshafts and what spec numbers they are used on or something like that. That PDF has a couple hundred pages, at least.
There is no 'I' suffix for the model number. Here is the complete list:
A - special oil pan
C - clutch model
G - generator application
P - pump model
Q - quiet model
R - reduction gear
S - electric start
T - retractable start
ST - electric start and retractable start
EP - electric plant
(This list would be great to have in the Tech library, since this is being discussed in multiple threads at the moment and comes up rather often.)
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