An easy way to check the compression release is to take the plug out and crank it over several turns, then put the plug back in and crank it over several turns. If they crank the same, then the compression release is working. If it is much slower with the plug in, then the compression release is probably not working.
I am thinking that a bad connection or a tired starter may be the problem.
Good luck with your cub!
__________________
John
Proud Owner of a Model 100 and a Model 124.
A homemade cart, 2 x 42" mower decks, a 38" deck,
a 42" front NF blade, and a lawn sweeper!
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