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    2019 25HP Yammy. One Plug Fouling, the other is fine???????

    Hi All: I have a 2019 25hp Yammy F25LWTC that is causing me grief. This has been a problem since new (yea... I know... but by the time I "knew" this was a problem... out of warranty, covid BS bla bla bla). The lower plug (2 cyl. 4 stroke) fouls after about 20 hours, the top plug remains...
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