Hope this helps
Model Designation
The model number designates the cubic inch
displacement and the number of cylinders - Model
K241A, for example designates 24 cubic inch
displacement, 1 designates single cylinder. The letter
suffix designates a specific version as follows:
A-Designates Oil Pan Type
EP-Generator Set
P-Pump Model
Q-Quiet Model
R-Gear Reduction
S-Electric Start
T-Retractable Start