Why engine cut off when increasing the Accelerator?

[Asanka]

Our boat engine did not start for almost 10years, boat engine started fine, also we can accelerate it to the maximum in a neutral position without any issues, but when the boat starts to move, it can only move very slow speed, as long as we increased the speed engine shut-off automatically.
We have changed all the plugs and cleaned the flue lines, but the problem is still the same.

What cloud is the problem?


Engine Type; Mercury 225XL 1996

 

[racerone]

Stop revving it up in neutral.-----Clean the carburetors if it is equipped with them.

 

[GA_Boater]

Put in a new impeller and do a pressure test on the lower unit after draining the old lube. Refill with new lube.

Welcome aboard.

 

[Faztbullet]

As posted clean and rebuild carbs

 

[Asanka]

Thanks for all the answers, I have cleaned the carbs. also noticed that oil is sucking into the piston. do I need to change the Piston Rings?

 

[racerone]

???-----Not so fast on your thinking.------If motor starts and idles fine there is nothing wrong with piston rings I would say.

 

[Sea Rider]

Perform an individual electrical component test with proper instruments : Troubleshoot Exciter Coil, Pulser Coil if having one, CD, Ignition Coil Pack. Electrical components have a lifespan, are not eternal and that's a 25 year oldie having issues only when at load with 0 issues at neutral. One of them seems is working erratically, heats up, shorts and motor misses...

Happy Boating​

 

[Tech Tony]

Did you take apart the carbs and make sure all passages were clear? Or did you only spray some carb cleaner in it and call it a day?

 

[racerone]

Please explain what you mean.------" oil is sucking into the piston "-----What did you observe ?----Or did you see a lot of blue smoke ?-----Is there an oil injection system ?-----Or mixing at 50:1 on it.

 

[merc850]

"Stop revving it up in neutral." (Maybe it's too late!)