rattle/misfire/gear sound during deceleration

[esto99]

I have a 95 90hp Ocean Pro that makes a rattle or misfire type of sound when I decelerate. Any one seen this before - I am the second owner and have no maintenance history. Could there be something loose in the drive? Acceleration is fine - no noise. Deceleartion with a skier or tube (under load) does not have the noise. Typically occurs from high RPMs 4500 down to 3000rpm. Any ideas are appreciated.

 

[rickdb1boat]

Re: rattle/misfire/gear sound during deceleration

Hi esto99

Make sure your prop is torqued down properly first. Other than that, I have no idea what could be rattling..Maybe others will have an idea...

 

[Fl_Richard]

Re: rattle/misfire/gear sound during deceleration

I've got a 1995 150 - one of two has this problem. posters seem to have ruled out clutch dogs as it never pops out of gear during forward running.

I've been babying it along....

 

[R.Johnson]

Re: rattle/misfire/gear sound during deceleration

What you are hearing is probably a deceleration knock. When the engine does this, push in the fuel primer, and see if it goes away.

 

[Fl_Richard]

Re: rattle/misfire/gear sound during deceleration

What if it goes away?

 

[R.Johnson]

Re: rattle/misfire/gear sound during deceleration

You have a lean condition on deceleration. The primer is adding fuel which will richen the mixture. This condition seem's more noticeable on the latter V-4's. It does'nt seem to harm anything. If the sound goes away, you know where it is coming from.

 

[Fl_Richard]

Re: rattle/misfire/gear sound during deceleration

Thank you!

"It doesnt seem to harm anything" ---- GREAT NEWS!!!