Rattle sound above 3/4 throttle

[MaxGen]

Hello,

My '88 30HP Johnson short shaft outboard is making a rattling sound only when I go above 3/4 throttle. I've noticed this on the first run out this season. The motor was stored outside this winter. It's a definite metal on metal sound.

I'm hoping for some suggestions on what I could look for. I'm not much of a mechanic, so my faint hope is that it is a fuel mixture problem. Failing that, perhaps I need some gear oil? I'm just guessing...

If it could be something moderatly easy to fix, I'll tackle it myself. Else it in to the shop I guess.

Thanks in advance

 

[tashasdaddy]

Re: Rattle sound above 3/4 throttle

electric or pull start. if pull start, could be tines on the starter hitting the flywheel. setting outdoors they could be goopped up, and not retracting all the way.

 

[BeerMonkey]

Re: Rattle sound above 3/4 throttle

sounds stupid but my 89 40hp evinrude started making a sound and it was the plate on the cover that had the 40 on it.

 

[MaxGen]

Re: Rattle sound above 3/4 throttle

Thanks for the suggestions guys. It's an electric start. I tried having a look with the cover off at idle, but the engine seems perfectly fine less then 3/4.

I'll keep trying to find out exactly where the sound is coming from.

Regards...

 

[BeerMonkey]

Re: Rattle sound above 3/4 throttle

to rule out the cover i guess you could remove cover and run it up to the rpm where it makes noise (on the water of course)