While doing other repairs, thought I would do a de-carb treatment. Had a couple questions.<br /><br />1. Are spray in the carb engine cleaner products effective? Was told by a local Yamaha dealer that Mercury's cleaner is better than Yamaha's?<br /><br />2. Is the procedure simply to remove carb cover, run engine at idle and spray in one carb at a time until rough idle then let engine recover and move on to the next carb?<br /><br />3. Should plugs be replaced after de-carb treatment.
