Not trying to scare you or tell you what to do but if I may recommend, download and read the Owner's manual
for that mower cover to cover, especially before jumping on it all excited again and the reason I say this is
because those engines cost about two thousand dollars plus labor, the rest of the parts on that machine are
neither cheap nor easy either, and even if it doesn't tell you anything you don't already know again I still highly
recommend download that owner's manual and read it cover to cover (translation, best you can).
From exmark.com, of course you'll once again need model and serial number.