igotworms Posted June 26, 2009 Share Posted June 26, 2009 I inherited an old Johnson 6 horse...what is the proper oil/gas mixture for a motor this old? Quote Link to comment Share on other sites More sharing options...
marine_man Posted June 26, 2009 Share Posted June 26, 2009 How old is old?marine_man Quote Link to comment Share on other sites More sharing options...
igotworms Posted June 26, 2009 Author Share Posted June 26, 2009 Maybe early 60's or very late 50's Quote Link to comment Share on other sites More sharing options...
kc0myy Posted June 26, 2009 Share Posted June 26, 2009 40:1 or 50:1 either one will work but I would stick to the low end. i have a 59' johnson seahorse and I heard to run the between 40:1 and 50:1 but again try to keep in closer to 40:1. the worst you can do the foul plugs. Quote Link to comment Share on other sites More sharing options...
swamptiger Posted June 26, 2009 Share Posted June 26, 2009 I'm thinking your 6 hp is probably a late 60s or early 70s model, and if so, it should be OK at 50:1. If I remember correctly, the old 1950s and early 60s Johnsons and Evinrudes called for a 24:1 ratio, but all they had for 2 cycle oil back then was 30w non-detergent motor oil. The oils they formulate for 2 strokes are much better oils now. I ran a mid-60s Johnson 75 hp V-4 for a number of years in the 1990s and I remember I always mixed 4 ounces of oil per gallon (I think that figures out to 32:1 ratio). Must have worked, because that motor is still running today - I know because my daughter owns it now, and it still runs like a top... Quote Link to comment Share on other sites More sharing options...
SkunkedAgain Posted June 26, 2009 Share Posted June 26, 2009 My '63 Johnson Seahorse 5.5hp runs at 24:1 oil/gas mixture Quote Link to comment Share on other sites More sharing options...
igotworms Posted June 26, 2009 Author Share Posted June 26, 2009 So 40:1 would be pretty safe? Quote Link to comment Share on other sites More sharing options...
SkunkedAgain Posted June 27, 2009 Share Posted June 27, 2009 It's always better to run more oil than less. If you are intent on running your motor prior to finding out the actual year, run it at 24:1. Otherwise, find the motor number and type it into the internet. You'll probably find specs for the gas/oil ratio. Quote Link to comment Share on other sites More sharing options...
theoilman Posted June 28, 2009 Share Posted June 28, 2009 Most older than 1960 (ish) take more oil - richer oil ratio (smaller first number) 24-1 is common for a lot (1 quart of oil to a 6 gallons of gas).Even if you choose to run AMSOIL ( Saber Outboard ) or another synthetic run it rich! Quote Link to comment Share on other sites More sharing options...
JimBuck Posted June 29, 2009 Share Posted June 29, 2009 Someone brought up the idea of an oil measuring container and I can't seem to find one. Anyone know where I can pick up one of these? Quote Link to comment Share on other sites More sharing options...
Black_Bay Posted June 29, 2009 Share Posted June 29, 2009 Someone brought up the idea of an oil measuring container and I can't seem to find one. Anyone know where I can pick up one of these? Go to a motorcycle shop. Most will probably have them. The brand I have is called a ratio rite. They're about $5. Quote Link to comment Share on other sites More sharing options...
JimBuck Posted June 29, 2009 Share Posted June 29, 2009 Thanks Black_Bay, just what I was looking for. Quote Link to comment Share on other sites More sharing options...
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