1970 evinrude 85 compression reading

[wannabewelder]

Hi, don't have my FSM yet but I bought a 1970 85hp Evinrude and it comped out at 130is on all four. Starts and runs nice but I was wondering if it's a bit low? I have a 55hp that is over 150lbs and a 40 that is at 115lbs. Runs pretty nice but just consider whether to maybe hone an ring before one hangs up and costs me a scored head.
Thanks in advance.

 

[boobie]

As long as it runs good for the age of the motor I'd leave it. Maybe run some OMC Engine Tuner through it.

 

[DouglasW]

https://forums.iboats.com/forum/eng...s/347704-79-v4-85hp-evinrude-compression-spec

 

[F_R]

As long as it runs good for the age of the motor I'd leave it. Maybe run some OMC Engine Tuner through it.

Agreed, it is good 130 & equal. Some engine cleaner won't hurt and might even be good for it as preventative maintenance.

 

[oldboat1]

https://www.iboats.com/shop/engine-parts/1970-Evinrude-85093D-Gear-Case-Parts.html

I had mine for many years -- great motor, imo. It survived a brief overheating episode because I waited too long to replace the impeller (not recommended). Put a fresh one in.

 

[F_R]

On that subject, we had many water pump failures when those motors were only two or three years old, resulting in catastrophic engine damage. I suggest you inspect the water pump, and if it still has the original aluminum pump housing, replace the entire pump with the kit which includes a plastic housing with stainless steel liners. But if it has already been changed, all you need is a new impeller.

 

[wannabewelder]

thanks all! Well it got cold out here so I can't run it in the bucket so i'll drop the impeller like you said over the winter.