Carb issue?

Formie · ‎07-20-2020

Anyone ever deal with this one?: my ‘95 225 evinrude was struggling to get to top speed. It would only give me so much power at WOT. I put. New fuel pump, checked for air bubbles and replaced temp sensors and thermostats and no results. I finally had my mechanic check the carbs again and he found 2 needle valves closed and not getting enough fuel for high speed. He adjusted them and wouldn’t you know it, she took off!! It seemed the problem was fixed but after running it smoothly for about a half hour, it started to run a bit rough and continued to only give me partial power at WOT. What could have happened? It was going so well. Any ideas? Thanks guys!

BluewaterBill · ‎07-14-2011

The needle valves are for adjusting the idle mixture which has very little affect on high speed operation, but they do contribute to accleration when you open the throttle quickly.

If the motor is only running about 2500 rpm and rough, yet smooths out below that rpm, the SLOW feature for overheating may be kicking in, but you should also see that on your TEMP or HOT light on the gauge or tach.

"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald

***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.

Formie · ‎07-20-2020

Engine isnt overheating and the sensors are all new. What would be setting that off?

BluewaterBill · ‎07-14-2011

First you or a trained tech has to determine if the rough running is the result of a fuel, ignition, or mechanical issue

"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald

***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.

Formie · ‎07-20-2020

Did that. Fuel, compression and ignition is all great

BluewaterBill · ‎07-14-2011

@Formie wrote:
Did that. Fuel, compression and ignition is all great

Did you test those items during the rough running mode?

"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald

***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.

Carb issue?

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