The series II is spec number 24300 and higher, and will likely have an oil filter blockoff plate on the forward part of the right side of the engine case. A cub-spec series II will have a round air cleaner that says 'Series II' and a plastic oil fill cap. The series I will have a metal pipe plug for the oil fill cap. The series I did have some oiling issues if it wasn't maintained well. There are many engines that can be used to replace the series I with few modifications.
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