10 Percent Ethanol

[BillPutney]

you nailed it.I have had my lawn mower repaired twice and each time it has acted up just as all of you have described . power starts to be reduced until finally it is puffing smoke and skipping.Twin cyl. 22 hp briggs .It eventually bent an exhaust valve in both instances an it is doing it again , the last time the repairman said he thoyught it needed a new carb.