Posts: 3508
Location: Elk River, Minnesota | Hiya,
I would say changing a fuel filter would be a good start. I would also consider replacing plugs as well...simple preventative maintenance items such as those can make a huge difference.
I would also consider using the sea foam in a little different manner than just in the tank as well. Get the engine warm at high idle. Remove any cowling that will let you get to a throttle body or carb. Set the motor to high idle, then start slowly introducing straight sea foam to the intake. This will cause the motor to bog down and white smoke will start to come out the exhaust. continue this for about 1/3 of the can, then start pouring in at a higher rate to kill the engine. Once the engine kills, pour another 1/3 can into the intake, then let the motor sit for 25 minutes to an hour (preference is yours). Then, put all cowlings, etc. back in place, then take it out for a good running to clear out all the gunk. This will clean your combustion chamber, which can help with what you are dealing with as well.
If you choose to do the deep cleaning like this, do it before replacing plugs. Once you have run it through, replace the plugs so you have good clean plugs with a clean combustion chamber.
Being an inboard outboard, I am also wondering if you have a way to check the timing of the engine as well. Never hurts to check this as if timing is off, you will not idle well either.
Lots of little things you can do here to try and get the problem fixed, and even if you don't find the problem, you are doing things to the motor it should have done anyway, so it is not a loss for doing so.
I'd say start with these and see where you are at..
Oh...one more thing to check for the cutting out at speed...check any fuel lines that may be pinched. I'm guessing since you are dealing with an I/O, this is not the case, but just one more item that could be an issue.
Steve
Edited by VMS 6/3/2013 7:53 PM
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