A series 1 equipped cub will accept a series II or better yet,a Magnum
they are both bolt in's.
The magnum does require an additional simple relay to kill the engine.
Enjoy the series I till it dies a natural death then either switch as mentioned,
or as others have done a later OHV valve engine.
Both my 782 have magnums, love the sound & torque of the opposed twins.
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