I'm doing an engine swap on my '64 Cub 100. Both motors are K241 10hp Kohlers but upon swapping the good parts to the new engine, I noticed the way the flywheel screen/drive coupler attaches to the crank are different. The original attaches via a bolt in the center of the crankshaft and the new engine has a threaded crank on the outside only. What should I do??
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