Yamaha 115, 2 stroke in trouble

mrossj1

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Joined
Oct 12, 2009
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Last week I was returning to port at 3/4 to WFO when I heard a loud "bang" and thought something hit my motor cowling. I entered the no wake zone soon after and idled to the dock without any problems.

This morning I put the boat in the water, she started up no problem, idled like always and then cruised through the no wake zone without any problems. Once I put the hammer down to get up on plane is when I experienced my problems.

The motor didn't get the boat on plane and then started sputtering, lost power and almost died. I put it in neutral and it idled fine so I tried it again and the motor sputtered and then died. Each time I could start it up and let it idle without a problem. I was able to make it back to the dock at idle speed without any problem.

I thought it might be fouled plugs due to the amount of trolling I had done the week before so I changed the plugs. The plugs that were removed were all consistant with each other (black but not gooped up with oil, remember this is a 2 stroke).

I changed the plugs, splashed the boat again, she started without any issues, idled like before and did the exact same thing.

Please help.
 
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