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Motor question?


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I have a 2000 johnson 115. Ive had it and the boat for about 10 years now and never had a problem. This year i ran it the first time for about 2 hours and then when under full throttle the motor would cut in and out, i switched out gas for fresh gas, it was winterized with stabil and run through the motor prior to storage and i ran seafoam through it after storage. The problem continued after the fresh fuel was put in and a fresh dose of sea foam. All other speeds are fine but when Im at full throttle it almost dies and then comes back Im usually good at figuring this kinda stuff out but im baffled at this one please help!

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well new lines, new filter same problem. when i went to get the new filter the parts guy told me to run the motor and when it started to bog out to push in choke and if it revved up it was starving for fuel if it died it was electrical. I thought that if you choke any motor while its running (especially at high rpms) that it would kill. i read a tip about decarbing a motor with seafoam, so i think that im going to try that, but if anyone else has any ideas that would be awesome.

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If its starving for fuel, pushing in the choke (primer actually) will give a small shot of gas and the engine would pick up. If its not starving and you do that, it will bog down due the over rich condition (because you gave it the extra shot it did not need.

So, in short,...

If it picks up, look towards fuel.

If it bogs down, look elsewhere like ignition.

Have someone in the boat with you and while running and it acts up, have them squeeze the bulb. This will momentarilly "take the place" of the fuel pump. Do this before buying a bunch of parts.

To check for ignition, hook up a timing light to the plug wires, one at a time and look for the light to go out while its acting up.

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Thanks guys! great advice! I am going to try it out. My choke is pushing the key in while turning it over, I can do that while its running too, should I use that or the primer bulb or does it even matter? I am assuming the bogging should quit if this is done and it is a fuel starvation problem??? I am really hoping it isn't an elec. problem, I know that those parts can be pretty spendy!

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