1988 25hp Bogs down when throttle engages

1988 25hp Mariner outboard

Problem:
The engine starts and idles fine when the throttle is not engaged. When the throttle is engaged and the engine attempts to increase rpm it bogs down and acts sluggish. Problem is intermittant. Seems to dissipate the more the engine warms.

First Thoughts:
-Engine was running one single cylinder (Ruled out through compression test and ignition test)
Is it possible to run on two cylinders w/o the the throttle in gear then run on one when the throttle is put into gear?

Checked:
I've checked the compression and the ignition coils both show no signs of problems.




Any thoughts and/or comments would be appreciated. Im leaning more towards a fuel related problem.

Re: 1988 25hp Bogs down when throttle engages

I just solved the same problem with my 93 Merc 20HP. Float was sticking and then the engine would load up with fuel when the throttle was opened. You can clean and rebuild the carb but I was lucky. I removed the fuel line from the top of the carb. Ran the engine out of fuel. Then sprayed the carb full of Gum-Out carb cleaner and let set a few minutes. Reconnected the fuel line, restarted and problem was gone.

Good luck.