Oil Mixture on 1970 evinrude

F1shermun · #1 June 23rd, 2009, 11:43 AM

I am new to boating. I have a 1970 evinrude 85hp starflite. I am not sure what the mechanic mixed the gas oil ratio at originally but it ran great and started with just a turn of a key. I used up my first tank of gas this weekend with seafoam and I mixed the next tank with seafoam and penzoil marine oil at 50:1. This seems to make it hard to start and it doesnt want to idle at low speed. I hope it is just a bit too rich. Any suggestions??

ezmobee · #2 June 23rd, 2009, 11:47 AM

50:1 is correct.

clemsonfor · #3 June 23rd, 2009, 01:52 PM

it will not be hard to start regardless of the mixture, well maybe like 3 or5:1, but even mixed at 25:1 your motor will fire off like there is no difference, it will just smoke more.

F1shermun · #4 June 24th, 2009, 10:48 AM

Any suggestions as to what it might be? Once it is started it runs like a top, it just wont idle.

ezmobee · #5 June 24th, 2009, 11:40 AM

Probably a dirty carb. More specifically partially clogged low speed jets.