I have a 2003 Yamaha 50 2 stroke. Compression is 120 on all 3 cyls, and good spark and ran on 2 diff fuel tanks. It coughs and sneezes real bad as soon as you hit the butterflys while on the hose or in the water. I rebilt the carbs on all three with new carb kits and sprayed all orfices with compressed air and carb cleaner, and it did the same thing with no change on carb rebuild. I put new plugs in and the third one seems a little more wet than the other two, but when I pulled the fuel pump of I did not see anything that stood out. The carbs also did not look bad at all. Timing was also good as was sync and link. I am leaning towards rebuilding the fuel pump was wondering if anyone else had any suggestions.
Thanks for any help.
Thanks for any help.