what year did they start using 50:1

[hitace]

what year did they start using 50:1?

 

[bassboy1]

Re: what year did they start using 50:1

I would like to say 1965.

 

[hitace]

Re: what year did they start using 50:1

ok thanks

 

[Scaaty]

Re: what year did they start using 50:1

Hey, I got a good idea...how about WHAT MOTOR?...does make a big diff, and application info would help too

 

[BoatBuoy]

Re: what year did they start using 50:1

From the BRP/Evinrude website:

Q - What is the fuel/oil mix for my motor?

A - The following is generally true: 1958 and prior used 20:1, 1959 thru 1963 used 24:1, 1964 and newer use 50:1. High performance usage (racing) requires a ratio of 25:1. New engine break-in (not DI) requires 25:1.

 

[Chris1956]

Re: what year did they start using 50:1

Hitace, What Boatbuoy said is correct, however, some OMC models built before 1964 has all roller, needle and ball bearings, and could therefore use a 50::1 mix. The Fat-Fifity ('58 and '59) is an example of this.


Also, I think Mercury went all 50::1 prior to 1964.

 

[deejaycee_2000]

Re: what year did they start using 50:1

hey hitace, we are still waiting for pics of that big motor you bought ......

 

[hitace]

Re: what year did they start using 50:1

so would a 1958 35hp lark be 50:1?

 

[Chris1956]

Re: what year did they start using 50:1

hitace, I believe the '58 Big Twin can use the 50::1 mixture. I recommend you consult Joe Reeves for the definitive word. If you can get a hold of a exploded parts diagram for that motor, you can look to see that it is all roller needle and ball bearings (no bushings). If it is all needle, ball and roller, you should be good to go with 50::1. (wrist pin, mains and crank pin)