Clr Outboard Flush, No I guess I shoulda clarified. Here are tips to outboard flushing, the right way. So filling the system with CLR and letting soak for 24hrs or so should theoretically work IMO. Had to pull the heads and spent lots of time cleaning out the pathways. Cleaning out old salt, calcium and corrosion with a CLR flush technique. I had the same issue on a Yamaha 175 2 stroke. Reason why CLR did the trick. In the past, phosphoric acid has done the job nicely. So salts containing calcium or any other salts that would "Frank, have flushed engines m "Frank, have flushed engines myself with either CLR (expensive) or simply a 50/50 vinegar/water mix. Outboard Motor Overheating? Acid Flush Fix!! Cleaning out old salt, calcium and corrosion with a CLR flush technique. tons nnkp0 aaks lupaea 16xn pu1 yug0 fe0hg4 nom vvhm