1977 evinrude 85 Hp fuel oil ratio

[Steinke8705]

So I bought this boat the other day. They guy told me its mixed 32:1 but everything I have read says 50:1 or 40:1 what is the real answer? Is running 32:1 bad?

Sorry I am a newb and dont wanna mess this up.

 

[Daviet]

Re: 1977 evinrude 85 Hp fuel oil ratio

The proper ratio is 50:1, you can run a richer mixture, it will smoke a little more and might foul plugs quicker.

 

[glnbnz]

Re: 1977 evinrude 85 Hp fuel oil ratio

Yes I have been running my 75 85hp at 50:1 all summer

 

[Steinke8705]

Re: 1977 evinrude 85 Hp fuel oil ratio

I was running it on the 32:1 and it seemed to do fine. Is there gonna be a problem if I switch to 40:1 or 50:1? Will I notice a difference at all?

 

[Daviet]

Re: 1977 evinrude 85 Hp fuel oil ratio

Shouldn't be any problems running 50:1, but if you like running 32:1 go ahead and do it, woun't hurt anything except more smoke.

 

[Steinke8705]

Re: 1977 evinrude 85 Hp fuel oil ratio

Will I notice any more power or speed? I have obly had it out once and it did smoke everytime I started it.

 

[emdsapmgr]

Re: 1977 evinrude 85 Hp fuel oil ratio

Carbed two strokes always smoke when started. Even if they are warmed up. No real need to add extra oil to the fuel mixture. As mentioned 50:1 is the recommended factory service manual mixture ratio for 1977.