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115 Yamaha Saltwater Series Experts (2-Stroke) - Engine Bogs Out Under Load

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115SWS_2STK

New member
Hey guys, I have a late 90s 115 HP Yamaha Saltwater Series 2-Stroke that is having issues under load.

The motor starts up fine, idles real well, and can be reved in neutral as well.

The issues is that when it is put under load and I try to get past a certain mid-range rpm, the engine starts bogging out. The issue can be remedied by engaging the choke and it will get past that point. Besides that mid-rpm issue (where it feels like the engine isn't getting enough fuel), the engine runs great in all other RPM ranges.

Fixes that were done so far:
1. New fuel lines
2. New fuel pump
3. New fuel filter
4. Carburetor has been taken out and cleaned through a sonic cleaner machine
5. Typical 300 hour maintenance (water pump, thermostat, gaskets, spark plugs etc)
6. Spark plugs were tested for power and they seem fine.
7. Checked compression and it was good.
8. Fuel/air mixture adjusted and runs well on that

Future testing procedures I will do:
1. Run it again on spare tank
2. Try seafoam in spare tank
3. Check if bulb stays hard during engine running

Do you guys have any advice on what it may be?

Thanks
 
Pull the carb cover off, have someone drive the boat while you look in the carb throats.... When it gets to the point where it bogs, you will see the carb port that is not fueling the engine.... The fuel coming through the emulsion tube will be less on the problem carb. You can actually cover the emulsion tube briefly with a finger and see which one it is while running under a load..... You will feel the cylinders drop out when you cover the tube....
 
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