2006 Mercury 25 EFI Whining Noise

[MotorlessCSJ16]

When running on the hose, and even in the water at low speed, the motor runs quiet and smooth. But once the RPM pick up and approach WOT, it starts to have a whining noise and won't get up to speed. Feels almost as if it's slipping somewhat...but not a prop slip.

The motor has <20 hours of pure freshwater use and has never been abused.

Any thoughts?

 

[MotorlessCSJ16]

Re: 2006 Mercury 25 EFI Whining Noise

Bump

 

[TOHATSU GURU]

Re: 2006 Mercury 25 EFI Whining Noise

Could be a bearing. Someone else here reported that their Mercury had a bearing failure on the same model due to low gear oil level. There was a service bulletin awhile back to caution dealers to check them before they were delivered.

 

[MotorlessCSJ16]

Re: 2006 Mercury 25 EFI Whining Noise

Well...I'm actually looking into purchasing this motor. The seller is a friend of mine who's willing to give it up for $800. Is it worth taking the chance?

Keep the opinions of what it is coming...

Here's the description of the issue, again:

"When running on the hose, and even in the water at low speed, the motor runs quiet and smooth. But once the RPM pick up and approach WOT, it starts to have a whining noise and won't get up to speed. Feels almost as if it's slipping somewhat...but not a prop slip.

The motor has <20 hours of pure freshwater use and has never been abused.

Any thoughts?"

 

[TOHATSU GURU]

Re: 2006 Mercury 25 EFI Whining Noise

It's a steal at $800.00, but you need to determine what the whine is before you plop out money...Isn't the thing still under warranty?

 

[wmbutler]

Re: 2006 Mercury 25 EFI Whining Noise

I have the EXACT same issue with a Tohatsu 2 stroke 18HP engine. Did you ever resolve it? I'm hoping that you have an answer. I'm in the bahamas and it's hard to get decent diagnosis and even harder to get parts so I'd really like to get to the bottom of the problem if possible. Thanks in advance if you are able to help.

Well...I'm actually looking into purchasing this motor. The seller is a friend of mine who's willing to give it up for $800. Is it worth taking the chance?

Keep the opinions of what it is coming...

Here's the description of the issue, again:

"When running on the hose, and even in the water at low speed, the motor runs quiet and smooth. But once the RPM pick up and approach WOT, it starts to have a whining noise and won't get up to speed. Feels almost as if it's slipping somewhat...but not a prop slip.

The motor has <20 hours of pure freshwater use and has never been abused.

Any thoughts?"