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I have a craftsman 917.274041 with a 21 hp b&s engine.
It is several years old. What kind of carb cleaner would you suggest putting in the gas tank?

Thanks for ant help

None.....if it needs cleaning take it off and do it.

Second that opinion, there is no cleaner which will do a good job of cleaning a carb the way you would to do it.

donyboy73 is the best small engine mechanic on youtube. Look up his channel and do the carb cleaning yourself. It's really a straight forward process. It may take a hour to do (start to finish)and that machine will run like new again.