fuel mix/ 1970 evinrude 4 hp

[joejoe]

what fuel mix would be the correct mix to use?<br />I have had some folk's tell me 30 to 1 and others tell me 50 to 1. which is it. thx Joe

 

[joejoe]

Re: fuel mix/ 1970 evinrude 4 hp

I have ordered the book for my motor from kencook.com until i recieve it i have 1 more question how do i drain the old gear lube and add new on my 1970 4 hp evinrude. I'd like to say as a new member to this board that to all of you that spend countless hrs answering peoples questions a big THANK-YOU.

 

[JB]

Re: fuel mix/ 1970 evinrude 4 hp

Use 50:1, Joe. Fresh, 87 octane lead and alcohol free gasoline and Super Tech or Quicksilver oil.<br /><br />Red sky at night. . .<br />JB

 

[Fouled Plug]

Re: fuel mix/ 1970 evinrude 4 hp

To drain the gear lube, support the motor vertically. Remove drain screw near bottom of skeg and vent screw near cavitation plate. These usually are slotted screws. Allow to drain completely, then add new lube from squeeze tube or pump from bottom hole until it oozes out the top. Replace top vent screw, remove tube or pump, and replace bottom screw. It's important to use new washers on both screws. This is a bit of a messy job the first time or two, but it's inexpensive and will keep your gearbox happy. Change at least once a season, twice is better, especially before winterizing.

 

[Chinewalker]

Re: fuel mix/ 1970 evinrude 4 hp

JoeJoe,<br /> I would actually run your motor a bit richer than 50:1. Your motor has only one needle bearing - at the top main. All other bearing surfaces are bronze babbit bearings. I'd run it at a 32:1 ratio (pint of TCW-3 to 4 gallons). Bronze bearings don't generally do very well at 50:1.<br />- Scott