175 hp Johnson poping sound

JJB

Petty Officer 1st Class
Joined
Dec 28, 2006
Messages
274
2000 175 hp johnson carb , I have always been told that a poping sound comes when you are running lean from timming or bad carb adj . I have rebuilt my carbs boat runs good wot but pops at idle or low rpms sometimes . I have adj the carbs like the manual tells you with the boat in the water in gear 650 rpms . I do each carb one at a time until it leans out then back it out slow until the ruff idle stops . its idles good but pops sometimes no matter what I do with these carbs or timming . I also notice my plugs are dirty and wet , the compression is 100 - 110 . thanks for the input jjb
 
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