Chrysler 7.5hp dies at WOT, idles fine

[markh28]

This is in a 1983 Chrysler 7.5hp, model 72H3F serial 1584.

I set the idle adjustment just like it says in the manual, and it idles beautifully, in and out of gear. Now this year I have used it a couple times and as I am puttering across the lake, I crank up the throttle and it bogs down and dies. If I creep the throttle up a little at a time, it will eventually start sputtering and die I can idle around all day long just fine.

I have cleaned and rebuilt the carbs last fall with new gaskets and needle and seat. I have also meticulously set the float to the specs in the manual I have. I also replace the fuel pump gaskets when I rebult the carb.

I know I have seen this problem before on the forum, but searching for "dies at wot" didnt get me anything useful.

 

[markh28]

Re: Chrysler 7.5hp dies at WOT, idles fine

Could fouled plugs do this? I am not sure what a fouled plug looks like, but I popped one out of this motor and its pretty black around the electrode. I got some new ones coming. The actual Champion number that the manual specifies. The ones in there now are an NGK equivalent that a marine shop recommended to me.

 

[markh28]

Re: Chrysler 7.5hp dies at WOT, idles fine

For the purpose of helping future readers, the plugs were fouled. I ordered the factory spec Champion plug and put them in. She's running great now. Thanks for all the responses.