motorboater23
New member
I have a 2006 Yamaha 25hp 2 stroke (MSH). Up until about half throttle runs great, anymore throttle and it starts missing and running ruff. Lower the rpm’s and it runs smooth again. I have rebuilt and cleaned both carbs, putting new main and pilot jets as well as new fuel diaphragm . Pulling choke makes it worse. Right before it runs out of fuel it takes off, seems to be running rich. Compression is good. Any advice would be appreciated.