Ive got an 09 yamaha 25esh 2 cyl 2 stroke that appears to be flooding the bottom cyl.
Carbs have been cleaned. Low speed jet was a little clogged. Looks great now. We took for a test. Basicaly the same results. I eventualy found that when i unpluged the gas line with the bowls full it would smooth out and take off like the day i finished breaking it in. I mean IMPRESSIVE!! until it started running short on fuel which i plugged line back in no punping the bulb. It would pick right back up for a bit the bogg down. Unplug the hose, smooths out and repeat all over again. Now the issue is what part is causing this? Originaly i thought the float needle was not closing so the fuel pump was just overfilling the carb. My dad pointed out to me that the pump gets its vaccum from the bottom cyl. I have since pulled both carbs. Examined the needle valves. They looked great to me and dad both. (Granted it dosent take much). Sooo out of curiosity i swaped the valves around. Reasembled and tested. Same results. I confirmed it is still the bottom cyl whe i pulle the breather cover off and a pool of gas was running out of the bottom carb throat. So would you think its the float needle, valve seat (fixed/pessed into these carbs) or something to do with the fuel pump. These floats are not made to adjust it is one plastic piece not metal like the old evinrude im used to working on. Any help would be appreciated. Looking around suggests none of these parts are cheap so itd be pretty nice to get it right the first time. Thanks
Carbs have been cleaned. Low speed jet was a little clogged. Looks great now. We took for a test. Basicaly the same results. I eventualy found that when i unpluged the gas line with the bowls full it would smooth out and take off like the day i finished breaking it in. I mean IMPRESSIVE!! until it started running short on fuel which i plugged line back in no punping the bulb. It would pick right back up for a bit the bogg down. Unplug the hose, smooths out and repeat all over again. Now the issue is what part is causing this? Originaly i thought the float needle was not closing so the fuel pump was just overfilling the carb. My dad pointed out to me that the pump gets its vaccum from the bottom cyl. I have since pulled both carbs. Examined the needle valves. They looked great to me and dad both. (Granted it dosent take much). Sooo out of curiosity i swaped the valves around. Reasembled and tested. Same results. I confirmed it is still the bottom cyl whe i pulle the breather cover off and a pool of gas was running out of the bottom carb throat. So would you think its the float needle, valve seat (fixed/pessed into these carbs) or something to do with the fuel pump. These floats are not made to adjust it is one plastic piece not metal like the old evinrude im used to working on. Any help would be appreciated. Looking around suggests none of these parts are cheap so itd be pretty nice to get it right the first time. Thanks