2-3 days ago there was a post about using ATF or Sea Foam or Rislone. VERY timely. My 140 was clacking, usually it would quit after warming up. But not this time. Tried 3 times. Poured Sea Foam into both the gas and oil.5-10 min later she's purring. Used 1/2 tank of gas on that long and winding road. Thanks much Ralph 69/140/4sp