Idles Fine then dies when reving

[Jml5808]

I am currently working on a 1986 force 125. I bought this boat and have nothing but "one more thing to fix" problems. The motor is hard to start cold but once it's running it idles fine. Turn it off and fires right back up. When I rev it up it shuts off. I tested spark and compression. Carb bowls fill up as they should. I have already replaced spark plugs, carbs took apart cleaned and new gaskets, new (used) stator. I was wondering if maybe it sounds like a trigger issue or I am thinking a fuel pump rebuild..I'm just not sure what to go to next..this boat is so close or so I thought to being water ready just don't know what to do next

 

[Stangster]

Just a couple of suggestions; 1) is the fuel new or left from previous years or owner? 2)have you tried “Heat”(alcohol additive to eliminate any water or moisture condensation that has accumulated in fuel tanks. 3) Most outboards have a filter screen @ the fuel pump inlet. On the 125 Force it is on the Starboard side if engine near the bottom of crankcase.There are other electronic issues I’m sure you are already pursuing. Hope you track it down. Good luck.

 

[Jml5808]

It is new fuel withawith seafoam added. I have not used any heat products. Are you suggesting I do that? You are the second person to mention that to me..stabil 360 was the other product..I'm just trying to figure out what's next. could a worn diaphragm in the pump cause this? Or is it possible trigger not keeping up with the carbs? Top two cylinders were not firing before. That is why I a replaced stator...getting spark now( shocked the hell out of me when I accidentally hit the plug wire near the connection while looking at some wire connections)..I'm curious as to what other electrical issues you might have in mind

 

[Stangster]

From your symptoms I don’t believe fuel pump issues are the solution. As for the heat alcohol additive, it can’t hurt anything. How strong of an odor does the fuel pump outlet have? Strong fresh from the place of purchased or does it have a stagnet turpentine like? If you were to remove the fuel bowl from the carb would you be able to see any evidence of water. Water would be visible at the bottom of bowl if it is. Just sounds like a fuel problem. Besides checking what I’ve suggested you have to keep going with different testing to see what works. There are tests by digital ohm meeter to test the trigger, other than that possibly a loose wire or ground someplace on the engine.

 

[Jml5808]

I have been researching day and night over this issue..I have had the carbs off twice now to clean them. First time I soaked them in the gallon can you get at AutoZone. Second time I just removed the bowls and sprayed them with cleaner and air. I haven't noticed any water but then again I really didn't have that on my mind. Its been raining like hell here in Nashville for the past week. The boat is stored outside with a cover for both boat and motor. I will try the alcohol treatment and see if that works. Anything is possible and water could have gotten into the separate fuel tank I've been testing from. I was wondering if I'm just running a hose into a 1 gallon fuel can with no cap is it possible that it is vented too much?

 

[jerryjerry05]

No such thing as venting to much.

Starting procedures???
The choke, you holding it in as you turn the key? Or releasing it after the initial push in?

Tilt the nose of the boat up as far as it will go.
Unhook the fuel line from the intake side of the pump.
Squeeze the ball and direct fuel into a clear jar or bottle.
Let it flow for a while and see if there's water in the gas.

Running past an idle: clean the high speed jets.