Gas mixture

[skinnykid69]

Ive got an old 5.5 hp evinrude and im not sure what gas oil ratio to use...Any help here....Im currently using 40:1, but if I can make the engine run lener it will only help...Thanks

 

[Walter]

Re: Gas mixture

Toss me the model/year/serial number...or any of the above...and I may be able to help.<br /><br />Walt

 

[skinnykid69]

Re: Gas mixture

Walt--<br />I know its a '63 Evinrude Fisherman 5.5 Hp<br />I dont have a serial number....Thanks

 

[Walter]

Re: Gas mixture

I think 40:1 is about right... Todays high quality 2 stroke oil allows you to stretch the oil/fuel mix a bit more. You could try a 50:1 ratio but nothing leaner...<br /><br />Walt

 

[Big Four]

Re: Gas mixture

Two years OMC's position on this was anything built after 61' could use a 50 to 1 mix. The thing was OMC didn't go to 50 to 1 till 64-65. Their later statement was to include all engines that had roller/needle bearings on the crank and wrist pins insteard of the clevite sleave type bearings. That 63 has the right bearings for the 50 to 1 mix. But consider this, most little engines like that are run wide open most of the time. I would stick with the 40 to 1 just for that reason.

 

[Walter]

Re: Gas mixture

Excellent advice Big Four! And very informative as well... <br /><br />In the event Skinny plans on using this mostly for trolling...would he not be ok to run a 50:1? I'm sure he and others near him would appreciate the benefits of a cleaner burning engine at low speeds IE: less smoke. Of course, if there's ANY chance he could damage his engine by using the leaner mixture...I'd certainly echo your advise to stick with 40:1<br /><br />Walt

 

[skinnykid69]

Re: Gas mixture

Thanks Walt and Big Four.....It is appreciated