Thread: 02 Merc 25 hp 2 stroke

Sounds like the carb may need to be taken apart and cleaned. Has it sat up for a extended period of time?

Yeah, it had sat. It was just funny that it would idle so good, then die, when you try to throttle up. I thought it might clean itself up, but maybe not.

Originally Posted by trackerman1

Yeah, it had sat. It was just funny that it would idle so good, then die, when you try to throttle up. I thought it might clean itself up, but maybe not.

If I had to guess the high speed jet inside the carb is clogged not allowing fuel to pass therefore won't run past idle. That is a great motor,regret selling mine.

Not to disagree. Just my years, it's worked this way.
When you crack that throttle. It has nothing to do with the high speed side untell after X amount of RPM's.
I'm not saying a good carb deuch isn't needed. I'd just bet on the LS.

First crack open your lowspeed jet a quarter turn. Normally that will fix that problem.
The most important thing is to make sure your not running lean at high speed. That means real problems later down the road.

I'd clean the carb. It's so easy you'll wonder if you did it right.
Could be both jets, could be ignition related as well. You could try squirting some fuel oil mix in the carb throat while slowly applying throttle. If that helps, it's carb related and not ignition. Just take the carb apart and soak it in cleaner and blow out all passages with carb cleaner and compressed air. Put it back together and install it.
JBJ

I got a 25 Mariner that started doing the same thing this year. I found that if I pull the choke out for a split second and then push it back in it throttles up just fine. This will get me thru crappie season I hope . Then a good carb cleaning.

I have a 2000 25 mercury. It does the same thing sometimes. I also have to pull the choke out a little sometimes. Usually have to ease into it until it revs up some. Once it quits bogging down I can go ahead and open it up. I've taken the carb off and cleaned it i don't know how many times and it still does it. May need to try what Fishermike said and back out the low speed jet a little.