Allen
Is your #2 100 an early serial number Cub? My 100 (June 1964) had a 2 piece cam that did not have a compression release on it. The smaller pulley help to spin the motor over. I replaced the 2 piece cam to cam that has a compression release. It starts easier now.
My 70 has a smaller pulley on it. It was built in March 1965.
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